If I lost 95 watts Id brag that I once had 95 watts
@insanecomicdude
14 күн бұрын
My main takeaway here is that, on tarmac, running the wrong pressure is only going to cost me up to about 3 watts, so I don't really need to be too precious with my tire pressure for everyday riding. Great vid, Ollie!
@davidzof
14 күн бұрын
I tested this myself and agree that there isn't a huge difference over a wide range of pressures: kzitem.info/news/bejne/2Hhm1WWdfYd5a2Ufeature=shared
@deDANIEL11609
14 күн бұрын
but it will fuck up your comfort?
@mattshipstone9361
14 күн бұрын
Equally swapping tyre width doesn't really make much difference. I got 28s rather than 30s because they were on sale. Looks like the right choice!!
@jbstepchild
14 күн бұрын
Long term 100km ride that 3 watts is gonna show in time an pace but no matter
@billinhouston3291
13 күн бұрын
Great summary. We don't need super accurate gauges. Just get the tire at a pressure that gives you the most comfortable ride, and know that it's not costing you more than a couple of watts,
@ldakotatransplant6485
11 күн бұрын
After watching this video I decided to put it to the test myself and can with absolute certainty say you are 100% correct! When I adjusted the front tire pressure I gained 5 watts in Zwift!
@pompeymonkey3271
11 күн бұрын
lol
@powerbastion1083
10 күн бұрын
hoohoohoo
@fylbike
7 күн бұрын
😂😂😂
@cotillion1687
5 күн бұрын
What about the rear?
@ldakotatransplant6485
5 күн бұрын
@@cotillion1687 It's flat, leaning up against the wall. 🤣Bike is attached to my Tacx Neo trainer.
@joe2mercs
8 күн бұрын
This whole exercise revisits the concept of Dunlop. He invented the pneumatic tyre at a time when tyres were solid. The result was a faster and more comfortable ride. Very high pressure pneumatic tyres effectively revert back to behaving like solid tyres. As with any suspension system the principle is to maintain tread contact with the surface being travelled over and this means keeping unsprung weight to a minimum whilst maintaining a well damped but highly compliant travel.
@Stefano-cz6bo
12 күн бұрын
As a mechanical engineer, I would welcome a next GCN video with an interview to the designer of this test rig. Some of the questions I would suggest are: 1 - only the rear wheel sits on the drum, whilst in the real case both wheels roll over the road, how do you factor in the resistance from the front wheel? 2 - How do you estimate the power loss? The only viable way I see is to get it as the difference between the power input by the cyclist at the cranks and the resisting power at the drum. However, when we talk of a resistance as small as 20 W, the accuracy of the two powermeters becomes crucial. Ollie: it's not a matter of the sampling frequency (Hz) that matters, it's rather the accuracy of the sensors. If the accuracy is 1% of the range and the range is, say, 2000 W, or maybe even just 1000, it's AT LEAST 10 W uncertainty at each one of the two powermeters, so the total uncertainty is more or less the same as the power loss to be measured, for the good tyre at least. 3 - again assuming the power loss is obtained from the difference between the power input at the cranks and the resistance at the drum, do you remove the effect of the aerodynamic resistance arising from the rotation of the drum?
@ericd_br
11 күн бұрын
Silverstone uses the Body Rocket pedals, which are accurate to 0.1% across the functional range. So Ollie shouldn’t have been dropping those 1 watt claims at the end, but otherwise he was OK.
@OUTDOORS55
11 күн бұрын
The cycling world is full of claims with these exact questions. When you question them they just say you're too stupid to understand the testing procedures. We have a word for it down south, its called snake oil.
@samuelebressan3676
10 күн бұрын
My guess by looking at how the bike is fixed at the fork is that the measurement is done at the front hub, by how much the whole bike is pulled backward by the rolling in-efficiency, which is generated then by the sum of rolling resistance, drivetrain resistance and a small other factors probably neglectable…
@benbrindle8165
9 күн бұрын
Literally minute 3-6 explains all this. Fml. Most of what you’re writing has already been well known a long time. They change one variable at a time which gives the difference. The whole system is measured and they are not using commercially available power meters - it’s lab grade transducers and strain gauges. By the 7 minute point this is all apparent. It’s as good a system of tests you’re getting. It’s not a wind tunnel. It’s simply for the non-aero factors.
@Pastamistic
7 күн бұрын
I would assume that they're just trying to gather data for comparisons. Even though it's not a perfect test relative to real world riding the rolling resistance data comparisons between different pressures and tires should remain true.
@kunzworld2309
14 күн бұрын
Ollie at his best. Totally geeking out about the test machine and its results. And me? Glued to the screen and just loving it!
@joeuser2360
8 күн бұрын
Not only is Ollie at his best, he is the best GCN staffer for this kind of data intensive tech testing.
@-Demis-
14 күн бұрын
I'm under a lot of pressure, but I'm still rolling with it! 🚴♂️
@john_7986
14 күн бұрын
This is the comment I was looking for. Congratulations!
@user-nu5fx6en9h
14 күн бұрын
Congrats then 😂
@SoulClubCoffee
14 күн бұрын
must be rather tiring
@Gugner
14 күн бұрын
😅😅😅
@RovePaths
13 күн бұрын
Like most of the internet, full of air.
@kidShibuya
14 күн бұрын
Might want to change the title. I thought this was a clickbait type video with nothing useful, but I watched when I saw the runtime and I am glad I did, always love good testing.
@space.youtube
14 күн бұрын
So the title is NOT click bait, but because you thought it was they should change it? Wouldn't that make the new "changed" title click bait to attract people who mistakenly think the original title is click bait? lol
@elgrego
14 күн бұрын
I second this,. This was the only time the title is less promising than the content.
@KelvinSuddith
14 күн бұрын
@@space.youtubenope because it sounds like an ad, which it is not. He’s suggesting changing to a title that doesn’t make it sound like an ad for some product
@FrancescoDiMany
14 күн бұрын
I agree, the title and the picture don't give the feeling that the video will be very interesting. And yet it is nicely done, with such a good scientific test. If it wasn't a GCN Tech video, I would not have try to watch it
@space.youtube
13 күн бұрын
@@KelvinSuddith You think the title of this video sounds like an ad? What sort of product, in your imagination at least, do you think the title of this video would be trying to introduce? It literally states what's on the tin and you people are aren't happy? lol Some people just like complaining I guess. Ps I don't think you understood my original comment, but thanks for trying all the same. 😁
@l.d.t.6327
14 күн бұрын
17:00 you shouldn't forget that tires at 2 bar tend to drift much more in corners. The testing rig, while very well designed, doesn't take this into account. And don't forget that while you're not bottoming out on that test rig, pro riders in a peloton, hitting a rock at 55k/hr, will have a much higher chance bottoming out.
@einundsiebenziger5488
14 күн бұрын
I understood it that when you lose 95 Watts at four bar, you lose "another" 74 Watts at two bar, meaning in 169 Watts in total. Totally agree that 2 bars only worked in this specific lab set-up. On the road it would feel all squishy, your tyres would slip away when cornering even at low speed and the tiniest bump would make the rim hit the road surface.
@jameshisself7375
14 күн бұрын
Agree. I love to corner very hard and I always preferred a higher pressure just to keep the tires from feeling like they were rolling off the edge of the rim. Straight and flat efficiencies are good to know but the world is a lot more dynamic than that.
@MrTandtrollet
13 күн бұрын
Yeah, conrnering with low pressures is how you end up in a ditch!
@zperdek
12 күн бұрын
@@einundsiebenziger5488No it's only 74w at 2 bars. We shouldn't forget that tire is air pillow. High pressure makes it sturdier and bouncier while lower pressure makes it softer and floatier. If you go through rough terrain do you want to float over rocks and sticks or do you wanna bounce on them?
@joeshmoe7967
8 күн бұрын
@@MrTandtrollet Especially on the front. You can ride out a back end slide, but a front end wash out, can leave you picking debris out of your face. LOL
@Andy_ATB
14 күн бұрын
Plenty of bike shops have been guilty of this as well. I recall buying a few bikes, and them pumping the tyres up to over 100psi - despite me asking them not to. Got home and let the tyres down to a proper pressure.
@pierrex3226
14 күн бұрын
If bike shop people were super smart, on average, let's be real, they would have had a different career. Cycling is also a world that's resistant to change.
@stevengagnon4777
14 күн бұрын
@@pierrex3226Ouch! Spent four decades as a professional bicycle mechanic in a LBS. My costumers would disagree with that sentiment.
@raybaxter4683
14 күн бұрын
@@stevengagnon4777 You missed the "on average."
@michael1
13 күн бұрын
@@stevengagnon4777 No they wouldn't. The dentist coming in to buy his pinarello or cervelo wasn't thinking you were smart. Bikes are simple as fuck too - you can build a bike from scratch in a few hours. Now, of course, perhaps the average member of the public who goes to a bike shop can't remove the back wheel so maybe he or she thinks it's an incredibly complicated mechanical device and you're a genius or something, but you'd be a fool to measure yourself against them to give yourself the impression you're highly skilled. if you spent 4 decades doing bike maintenance you wouldn't learn anything new after the first 2 or 3 weeks.
@DANCINGWITHTHEFAILS
13 күн бұрын
They may pump it up to that to seat the tire
@gtmedley
14 күн бұрын
Excellent tech video. I proves what I always have believed, the more you get into bike racing, the more it turns into car racing. Silverstone, even!
@fivish
16 сағат бұрын
When I cycled to school 60 years ago I checked the tyres with a press of my thumb. They were almost certainly under inflated. But nobody had a pressure gauge. Today I set them to 34 psi, same as my car! Looks like the tests agree for UK roads.
@mpvsystems9302
11 күн бұрын
This rig looks ideal for comparing the performance of an old school tubular with a TLR. For example, the Pirelli P-Zero is readily available in both formats in size 700 x 28. I would expect the casing material and layup to be identical too. Of course the big difference is that the tubular will have 30% more usable casing making it much more compliant and comfortable at any given pressure not to mention almost impossible to pinch flat. Also, one would expect the tubular to handle a much wider range of pressure especially on the low end owing to the flangeless rim profile.
@matthiaswuest7271
2 күн бұрын
How is it near impossible to pinch flat a tubular? It still has an inner tube, it's just woven into the casing
@mpvsystems9302
Күн бұрын
@@matthiaswuest7271 A tubular rim has no flanges. Pinch flats are caused when an inner tube gets "pinched" over the flanges.
@dudleyarnold5745
4 күн бұрын
Possibly the best cycle science video I have seen. Vindicates my view that a lot a cyclists inflate their tyres to high. 65 to 80 psi is a good median for most terrain.
@vo2maximus177
14 күн бұрын
To my knowledge, Pogačar routinely rode 30mm Conti tyres on fat, tall Enve aero rims for this year's Tour win. Although his body weight is very low which makes that counter-intuitive, of course his average speed is a lot higher, plus the aero gains when he attacks off the front become far more significant with that combination. Re: your comments about best tyre pressures on cobbles Olly, don't forget that most of Paris-Roubaix is ridden on tarmac or concrete slab, so the tyre pressures the Pros ride are necessarily a compromise between the rolling resistance on all those surfaces. Finally, of course we all wince at the thought of 70s Pros riding 23mm tyres in the very same race, but then they rode skinny, very shallow aluminium sprint rims for tubs, and there'd have been a lot of deflection and shock absorption going on within those rims, plus much looser spoking, also the forgiving steel frames and forks of the time. But for sure, the ride would have been harsher. Nice piece though Olly, fellow Physics nerd here!
@prestachuck2867
13 күн бұрын
He rode 28mm tires this year. Last year he rode 30s on the road and 32mm for tt.
@vo2maximus177
13 күн бұрын
What did he ride for TTs this year?@@prestachuck2867
@therider4909
12 күн бұрын
Flexy rims and steel frames might reduce a bit of road buzz but there's absolutely no way they'd soften something as significant as Roubaix cobbles. Pogacar's tyre pressure is not really relevant to recreational riders doing half the speed at best. It's like comparing an F1 driver's tyre choice to the cheap rubber for my 1.2 litre hatchback.
@vo2maximus177
12 күн бұрын
I disagree over the steel frames/forks and thin aluminium flexy rims, as well as the much looser spoking from those times. These would all, together, have had a softening effect on cobbles, although not as much as the much larger tyres used these days. I'm just making the point that you can't simply compare tyres now and then, its not that simple. The entire bike "system" was different, you take it as a whole. Modern carbon fibre bikes can be made with more flex, but for big, instant impacts steel is very absorbent. And Pogačar's tyre pressure IS relevant to me. I ride a Colnago, I ride Schwalbe Pro One Tubeless 30mm, and although I'm in my mid-60s I can still average Evens on my own, and faster in a group. I get the same big tyre benefits as him, with perhaps 0.5 bar higher pressure because I'm fatter than he is, but I get those same rolling resistance gains. He'll of course get more from them aero gains than me, because he goes a lot faster than me. Thanks. @therider4909
@RevoltingRudi
9 күн бұрын
they also rode 13-15c rims and Tyre stood over the rims. now 19C-21C and sindewall are very straight.
@renatolovato
13 күн бұрын
In other words, on tarmac: it will depends of the type of tyre, rider weights, and pressure to get more or less 3 watts. I'll continue use my 80 psi (between 6 and 5 bar) and it will not going to affect my super 195-205w on average rides.
@CatManDoSocial
14 күн бұрын
Great stuff, Ollie. Well done.
@mcg42387
3 күн бұрын
id love to see a calculator that we can enter our weight, tire width and riding type and then just get the right pressure to add
@rolandmg1
10 күн бұрын
This is a really interesting subject and as an engineer I find the test rig set up fascinating. I agree with lower pressures being more efficient on a rough surface but in a real life situation which includes climbing, sprinting and descending I don't concur. I'm in the Alps presently running Vittoria Corsa 28mm tubulars on Dura Ace 28mm wide rims and set the pressures to the Silca calculator which was 5.4 / 5.25 for my weight 72kg. This is great on the valley roads but climbing out of the saddle was too bouncy and descending and cornering fast around the hairpins was sketchy as the back tyre was slipping. Yesterday I increased the pressure to my normal 6.2 / 5.8 and the bike felt like it was on rails cornering and climbing felt so much more efficient. I know it's difficult to replicate these conditions on the rig but the results are a good starting point but everyone should tweak them for the terrain and conditions.
@joeshmoe7967
8 күн бұрын
I am very wary running too low on fronts. Back slipping is bad enough but I have had near wash out of the front when i had a leak that was dropping the front pressure until it was scary in the corners. I had to stop and pump back up until home. Downhill into a hard corner on soft fronts is not fun. I think the data is interesting, but point to finding ones best balance of f actors. - Cheers
@MrTeff999
14 күн бұрын
I don’t run the same pressure in both tires. Front is always about five psi lower than the rear.
@jimm4029
10 күн бұрын
And that should be rigth... if it the rigth pressure
@benedictearlson9044
10 күн бұрын
That is standard advice, but without a rig testing both tyres at the same time its hard to know if its the correct policy. Seems legit due to less weight over the front, but the arms act as shock absorbers unlike the lower body effectively reducing weight on rough surfaces? So who knows for sure, maybe it should be 10psi lower?
@MrTeff999
10 күн бұрын
@@benedictearlson9044 In addition to the rear weight bias, my theory goes like this: 1) A softer front tire is more comfortable and reduces numbness on long rides. 2) I’m less likely to get a pinch flat on the front because I can more precisely absorb or avoid hard bumps, and 3) I can avoid road hazards such as glass better with the front tire compared to a back tire.
@craigsawyer6453
10 күн бұрын
Running lower pressure in the front tire is for comfort and traction. Every thing is a trade off, if you want the least resistance High pressure and the smallest contact patch are the your friends, if you want a less fatigued rider, that five PSI lower is nice. Every ones riding style is different some crazy people can handle rattling their brains and a few of these riders may even have uncanny bike handling ability, these are the ones that seem to walk away from other riders when the going gets rough. A more aggressive tread pattern on the front, if necessary rear too, coupled with a narrow width, has less resistance than an under inflated wider tires. Question is are you the type of animal that can take all that punishment? For one race fine, for the season???
@tuber7853
8 күн бұрын
yeah...i feels the same with your point 1
@JanGoh-jb5ge
12 күн бұрын
I'd like to see more about tubeless tyres and inserts and how they affect handling and puncture resistance. The drift that I get on my tyres with a foam insert is very much like the feeling I got with high-quality CX tubulars. There's a drift, but it's controllable. You don't want that on the road necessarily, but it feels good on gravel bikes. But I think there's a lot to be done there. High quality TPU tubes are nice I guess, but they're still a tube and I feel like that has very specific drawbacks that most riders and unsupported racers shouldn't have to contend with.
@Bangbroer
11 күн бұрын
I use bicycle everyday for my transport, and a lower tire pressure made the bike easier to roll and controled. I don't feel any bouncing feeling on the tires.
@ericpmoss
14 күн бұрын
Ollie asked how they managed Paris-Roubaix on 23mm tires back in the day. Well, they had much more forgiving steel frames and forks, and 28mm tubulars on light aluminum rims that were 10x as forgiving as wide and deep carbon aero wheels.
@einundsiebenziger5488
14 күн бұрын
In the steel-frame era they rode on 20- to 22-mm tubulars pumped to the maximum allowed pressure. Indeed the flat box-section alloy rims factored in, it's only a few years ago that pro teams put these on bikes especially for Paris-Roubaix when they would usually ride deep-section carbon wheels for everything else.
@stevengagnon4777
14 күн бұрын
Many used Paves for the Roubaix...I used Paves all the time . Switched to 26 mm to 28 mm tubulars in the early nineties...I was heavy so it made everything better.
@rkentwenger5095
13 күн бұрын
Well, I think they had way more punctures, too. It was routine for riders to have multiple punctures and still win, which is pretty rare today. (My recollection is that when Hinault won in 1981 he had 4 punctures and 2 crashes, or vice-versa.)
@beeldpuntXVI
13 күн бұрын
@@rkentwenger5095not nescesary, riding on cobbles is more technique than you think, arenberg is an exception, but every cobbles pave has a ridge, ther where you would preferably ride. And every section has his own few golden speeds. On this speeds you fly from one ridge to the other. A little faster you jump more, a little slower the same. You see it even in action when Alex was riding 35 km /h he was in discomfort. When he slowed just a little the vibration was smaller. At even slower speeds, he vibrated more,….. High tire pressure gives puncture resistance, it is total system, material choices matter
@stevengagnon4777
13 күн бұрын
@@einundsiebenziger5488 as you mentioned the flat box section rims ( that I still use) made a big difference. They were relatively strong ( stronger and much lighter than clincher s) and could be easily tuned with spoke count, rim weight. spoke guage and tension. Being flat and wide they had good vertical compliance and good lateral stiffness. They really are a joy to ride and thanks to the acceptance of and availability of wider tires in tubulars , even better. I always rode paves anyway but the newer tires certainly give superior puncture protection. Those tubulars were also made from cotton which also softened the ride and for that special day with absolutely no rain in the forecast there was silk . Even at 100 kilos I could ride a 330 gram rim with 32 skinny double butted spokes will alloy nipples and a decent 23 mm training tubular up front ( being dishless made it possible) and as long as I didn't hit an immovable object they were plenty strong for daily use. Once I discovered Paves and those wider rims I never went back . The ride and confidence in the twisties was awesome.
@jbarner13
Күн бұрын
What's interesting about the observations of performance at different tire widths is that a one-watt difference is, essentially, nothing. So, even if going with wider tires may not provide as much benefit as some people claim, they are definitely more comfortable to ride and apparently this comes with almost no hit in performance. The flip side is that there are differences in how the bike feels when riding wide tires at low pressures, such as bouncing and that vague, mushy feeling when out of the saddle, as well as the increased mass and its potential affects on micro-accelerations that may create other limits on how wide a performance-oriented cyclist might want to go.
@tonym835
13 күн бұрын
Great video. Just to add, on Arenberg alone the system takes approximately 23000 hits (2300m x 5 cobbles/m x 2 wheels). Within those 23000, it's the random missing or proud cobles and wide gaps that are the problem.
@l.d.t.6327
7 күн бұрын
The system doesn't take 23000 hits. You often don't hit anything for a full meter with either or both wheels. At 40k/hr you fly over a lot of those cobbles.
@fiddleronthebike
14 күн бұрын
I don’t think the pros can go lower; the cobbles at Paris-Roubaix are totally different! This drum simulates „urban“ cobbles with a relative regular pattern - at P-R you have random stones and the wheels are hitting steps up to 5 cm and more. On that you will get pinch flats much easier
@LukeGJPotter
14 күн бұрын
Science Viewers, at 4:50, when Ollie says "One Hertz a Second": 😮 Excuse me while I withdraw money at the "ATM Machine".
@_Tp___
14 күн бұрын
Oh dear, poor from Dr Bridgewood.
@PsyKeks
14 күн бұрын
It gets faster and faster! First it's one Hertz, a second later it's two Hertz, then three Hertz. Soon you can hear it. Ride long enough and you can see it it.
@benoitbvg2888
14 күн бұрын
One hertz a second, how many BPM per minute is that?
@DaanHoogland
14 күн бұрын
/ss
@Randombourg
14 күн бұрын
Don't be too harsh, he's a chemist!
@ItachiGT
Күн бұрын
Interesting stuff. As a recreational road cyclist though I don't dive this deep into the setup. 5.5 to 6 bar pressure on 28mm tires is all I need to know good to semi good roads.
@svr5423
3 сағат бұрын
same for me. I typically pump it up between 5 and 6 bar. Good compromise. When I look at other riders, many of them barely have 1 or 1.5 bars in them.
@bobfoster687
14 күн бұрын
Dylan Johnson recommends 45mm or wider tires with pressure about 15-20 psi for gravel racing.
@kpsig
14 күн бұрын
These numbers refer to his body weight, while he also is running tubeless. If I do that on my clinchers which have to support my 95kg, I would have a flat within 10km.
@Foxtrottangoabc
12 күн бұрын
Continental Racekings
@demil3618
5 күн бұрын
How much is that?
@abirkhanrafee1889
14 күн бұрын
gcn should keep doing videos like these
@gcntech
13 күн бұрын
Thank you, that’s what we’ll try.
@grahamcollins6810
13 күн бұрын
"96% of Cyclists Get Their Tyre Pressure Wrong. How To Get It Right" Step 1. Build a multimillion pound rolling road facility Step 2. Test every type of tyre at every possible pressure on every possible surface Step 3. Let a bit of air out of your tyre Seriously though, the video was much better than the title - good info!
@yufoh7753
Күн бұрын
How is this a new thing? I've known this for 30+ years from experience as a casual cyclist because I pay attention to the feedback when cycling. It's the reason why wider tyres can be faster. They need less pressure to support the same weight and lowering pressures allows them to roll smoother on rougher roads. Less bounce back from the surface of the road is smoother, easier and faster. Best way to find out what works for your combo of tyre, weight and the roads you ride is to pay attention to the experience and when you get home, lower or raise pressures as needs be. Try again next ride then adjust again. Repeat until you're happy. This is the reason why I ride a gravel bike on the roads where I live. They're a combo or pretty rough, plus some smoother roads, so I use a gravel bike with 38mm tyres. It's lovely to ride now i've dialled in the pressures.
@millermiller75
14 күн бұрын
It seems like you want the pressure low enough and tire size large enough to absorb the average road bump size, say 1 cm, plus a little firmness for the big bumps without bottoming out. And if the road is only bumpy for a portion of the ride and smooth for the rest, then you want to increase pressure a bit to balance out the efficiency of high pressure on a smooth surface. The trick is to find that balance point, approximately.
@DaddyBrownbr
6 күн бұрын
Excessive air pressure increases the diameter of the tire, which has the same effect as increasing the diameter of the bicycle wheel, but consumes a little more energy. Another thing is that when a bicycle with high pressure tires passes an obstacle while riding, the upward and backward rebound force is greater, so it consumes driving energy.
@richardking6985
14 күн бұрын
great video...more width testing please
@gcntech
13 күн бұрын
You’re insatiable when it comes to tyres 😀
@helmutjarn395
13 күн бұрын
Hey Olli, just to make sure: When you compared results to the SILCA website you put in the "measured width" of the tire at 28mm. While I do not have the Pirellis for comparison, my 28mm Schwalbe Pro One TLEs for example are actually 31-31.5mm wide (hookless rims). The difference in recommended pressure acc. to SILCA is a full 1 bar compared to a tire that is really only 28mm wide.
@pcat007
12 күн бұрын
I found the table towards the end of the video great for some of us. For the rest of me, going lower than 35 km/h would be more helpful.
@johncraig2623
Күн бұрын
Intriguing to see how much the chain and derailleur bounced around on the simulated cobbles. That definitely reduces the efficiency of the drive train!
@superyamagucci
11 күн бұрын
Tyre pressure is easy - just get your thumb calibrated. My dad calibrated mine when I was about 10 and it’s been accurate ever since.
@user-qv3wn4dd3q
3 күн бұрын
I noticed the front end was rigidly fixed with no wheel or drum. This DOES have a huge effect. Would LOVE to see the test rig with a front wheel setup. In the days before my spinal prolapse ended my riding, I played around with this. Different width/pressure tires on the front (Keeping the back fixed) had a noticeable effect. I was running Conti 4000'''s 21/23/25.. Nowadays I potter along on my flatbar roadie and Schwalbe Mrathon at 60-70 psi, so it was interesting to see maximum comfort probably equals maximum efficiency. I think I'll go down another 10 psi. Thanks. informative video.
@geraldmaybebaby1585
14 күн бұрын
I'm still using my thumb to test tyre pressures.
@BostilCensurado
14 күн бұрын
just a touch off being completely rock hard, its the perfect pressure for asphalt
@Jean-jk4zv
14 күн бұрын
Same for me, if it’s flexing as a sporty girl butt it’s good to go.
@_Tp___
14 күн бұрын
@@Jean-jk4zv what the hell
@luukrutten1295
14 күн бұрын
Implant some strain gauges in your thumb and you might get something accurate.
@prestachuck2867
13 күн бұрын
A $45USD floor pump with an consistent gauge would change your life in a big way. Trek, Specialized, and Topeak all sell great pumps at that price.
@adunford2664
9 күн бұрын
With 30mm tyres I pump them up to the max pressure and go faster. No noticeable loss of comfort, no punctures in a year, no rim damage.
@musclelessfitness2045
14 күн бұрын
One of your better tire pressure videos, but you should've picked a better brand for the second tire.
@trepidati0n533
12 күн бұрын
You actually don't. One thing about "science" is you always start with a wide a difference as possible to make sure you can actually measure something of value. If they would have gone in with a GP5000 and a superfast tire, there may not have been much to talk about or worse yet, the wrong conclusion.
@PhilAndersonOutside
12 күн бұрын
I'm good with the cheap tire as a base. Though in an ideal situation they'd have tested like 10 different tires. But that could have taken days.
@richardclinker813
11 күн бұрын
I dropped my pressures to 4.5 bar front, 5 bar rear 28mm and did a ride past Silverstone. For me, no faster but felt a lot nicer, easier. By the way. Have also been experimenting with a thin layer of talc between butyl inner tube and tyre casing to see if that reduces internally induced rolling resistance. I think it might do...
@savagepro9060
14 күн бұрын
When GCN applies Peer Pressure: "96% of Cyclists Get High Blood Pressure when they get Their Tyre Pressure Wrong . . ." Slow Leaks: 😉 Local Priesthood Cycling Club: "Pray Sure!"
@einundsiebenziger5488
14 күн бұрын
Definitely true for the time I used a pressure gauge in addition to that on my floor pump. Re-adjustment of pressure took time, effort and ruined my mood. When the gauge was not working properly at one time, I smashed it on the ground, completely destroying it. I never replaced it and using just the gauge on my pump leaves me a much happier cyclist now.
@whazzat8015
14 күн бұрын
Pssst... Wanna tip on comfort?
@savagepro9060
13 күн бұрын
@@whazzat8015 "Psst"
@richardmiddleton7770
6 күн бұрын
Just made up a formula, seems to work pretty well: rider weight in kg, divided by tyre width, times 25. 🤷♂
@ericpmoss
14 күн бұрын
I know everyone likes to think there is a chart they can refer to and not think about it any more, but jeeeeez. There is one easy way to get the right pressure for a road bike -- on the day of your ride, ride a bit on the route you are taking, starting with obviously too much pressure, and slowly reduce the pressure until just the road buzz goes away. It accounts for everything -- your bike, your body, your tires and tubes, the road, the weather, etc. If your route has wildly varying surfaces, either adjust as the terrain changes, or decide which section you want to accommodate.
@demil3618
5 күн бұрын
This is brilliant. I usually inflate to about 2.5 bar and I can feel the difference when it is too low.
@bertrandsalaun3721
9 күн бұрын
I used to run 23mm tyres on cobble at 7 bars, for my commuting through Paris and her suburbs. It's shaky, but you simply get used to it. :) I run 28 at 6 now, and it's already a smoother and more efficient ride, even as an amateur. As you mentioned, however, in a racing situation, it's easy to conceive how different the mindset and savings would be.
@tiagotiagot
7 күн бұрын
Back when I was younger, as soon as I could afford it I got a full-suspension mountain bike with rear and front suspension that were good enough to handle jumps beyond what I myself felt safe performing, and always kept the tires at the maximum pressure allowed to reduce the odds of sharper bumps or hard landings pinching the tires and hitting the rims, to maximize the life of the rims and reduce the risk of cutting into the tires with the the rims, leaving the suspension to take care of making it a smooth ride (it was always a bit of a tense moment pumping the tire to the limit if I didn't had my mind elsewhere and instead remembered there was a chance the tire might happen to not handle the pressure anymore and would explode this time; never had an explosion though, but I always bought reasonable quality tires, so it wasn't worse case scenario)... I have no idea whether that was the best thing to do, but it's what I did.
@PsyKeks
14 күн бұрын
On finding optimal pressure, an industry professional said* to "search for smoothness". When you feell the vibrations, it's too high. But much lower than that isn't great, either. *) It was an interview with the less mainstream and less performance oriented chanel "the path less pedaled" (home of "partypace"). I think, Ollie and another presenter have met Russ and Laura on a shoot on some mountain this year or so.
@mikecar52
5 күн бұрын
I am 72. As long as I can remember wide tyre width on a bike means slower. Never checked it on a car but wide tyres are for great grip not fast speed.
@diegomonsalvi7217
14 күн бұрын
I never understood this, if I lower pressure in my car tires I use more fuel, so would not I use more energy if lower my bikes ? I ll stick to what has worked for me.
@vo2maximus177
14 күн бұрын
Lower the pressure in your car tyres to what? Below the recommended pressure? It's the same with bike tyres, but recommend pressures are now lower because of bigger tyres, especially with Tubeless or PU tubes. So stick to the recommended pressure for your bike tyres (and include your weight in the equation), and you will go faster.
@l.d.t.6327
7 күн бұрын
@@vo2maximus177 many bike tires still have way too high minimum recommended pressures, though. Most 23mm have recommended pressures above 7 bar, most 25mm above 6 bar and some 28mm above 5 bar while you can easily drop a bar with any of those recommendations.
@vo2maximus177
7 күн бұрын
@l.d.t.6327 you're forgetting considerations such as different carcass constructions across various brands which will also have a bearing on the best pressure for any given tyre, in direct conjunction with system weight (the dressed rider plus full weight of bike). A stiffer, less compliant carcass will generally require a higher pressure to achieve minimum rolling resistance. Re: 23mm tyres, when I raced as a 1st Cat biggish rouleur, if I didn't have at least 7 bar in my tyres I'd risk bottoming out and ending my race by the side of the road.
@l.d.t.6327
7 күн бұрын
@@vo2maximus177 I’m always talking high (>200tpi) clinchers and tubulars. And the tire construction / carcass is obviously a big reason why car tires are a different breed, with the carcass shaping the tire (square) away from how pressure would shape it (round)
@Pastamistic
7 күн бұрын
Such a high quality video! I love that Pirelli have been putting such a massive investment into this. I absolutely love the Pirelli Gravel H tires on my gravel bike. They roll so good on gravel and surprisingly well on pavement too. It would be fun to see how they compare to other tires and at different pressures.
@einundsiebenziger5488
14 күн бұрын
I have been riding MTBs and roadbikes since 35 years, even rode some competitions and countless alpine passes and granfondos all over Central and Southwestern Europe. Always pumped my tyres to the point they "felt fast", which may have been all wrong. I don't care, because the only point I did not enjoy a ride because of tyre pressure was when it suddenly went to zero - aka I suffered a flat. If you do not make a living by racing bicycles, there is no need to overthink this, just pump your tyres and go for a ride!
@tauncfester3022
9 күн бұрын
I used to ride our local century on my FWD recumbent with a 24"x1.375" width Cheng-Shen commuter tire on the driving wheel. Didn't need to pump up it to 80 psi, and it was more comfortable at 60 psi. This was on average US spec tarmac with all sorts of local differences in quality, from being less than a year old to 20 year old weathered/old tractor tire washboarding and pitting.
@edmundhodgson2572
14 күн бұрын
Good vid, so narrow is faster? Shame not to have had a 25mm in the mix.
@heinik4349
13 күн бұрын
Yes it is.
@dmitryhetman1509
13 күн бұрын
If your rims made for 25mm tires yes it is
@RobLarsen
14 күн бұрын
This was fascinating. Keep heading back! It'll be like Alex Dowsett testing everything he owns in the wind tunnel which was full of surprises (and even generated a product for Nopinz)
@bubblesezblonde
14 күн бұрын
Loved this content Dr Bridgewood.
@cjsa9253
4 күн бұрын
Fascinating and well researched test (given the constraints), very well presented by Ollie. I need to lower my tyre pressures 🙄. More of these please GCN.
@julianwalsh8400
14 күн бұрын
Not gonna lie, those reflective stripes on the cheap Amazon tyres actually looks pretty cool and is a pretty innovative way to add some retro-reflectivity to your bike at night.
@Jean-jk4zv
14 күн бұрын
It’s not innovative Vittoria and Shwalbe do this for a looong time in my experience.
@MrTeff999
14 күн бұрын
I wish Continental would add reflective stripes to their GP5000 line.
@SebastianTominec
14 күн бұрын
They have reflective strips on a GP5000 AS tyres.
@stevengagnon4777
14 күн бұрын
The relflecive strips are a big difference for motor vehicle drivers at night. Would like to see them on most tires.
@stevengagnon4777
14 күн бұрын
@@SebastianTominecit's definitely an underrated tire. The small loss in rolling resistance is well made up in real world riding...especially in the wet and cold weather of both spring and fall. It doesn't necessarily have to be wet as they will give better grip on dry and cold roads too. I would like to see more tires with actual treads too ... I don't believe that slick tires are good for all around real world riding. Especially since the acceptance of the wider tire.
@twowheelsintokyo7039
11 күн бұрын
Thanks for making this video showing other people what I have known since I was 8 years old. Even at the ripe old age of 8, I was racing my bike against other kids in my neighborhood, and learned that keeping my tires pumped up made my bike roll faster. What exactly is the right pressure for your tires? I usually start at above the recommended pressure on the sidewall of my tire, and I ride the bike every day. As the days pass, the pressure decreases, until the tire becomes soft. You can run the pressure again, and as they days pass, you can figure out what is the optimum pressure for your tire, your weight, and your roads. On that day or days where you get the best performance, check your pressure, and pump up your tires to that level before every ride.
@LivandTrekGoCycling
14 күн бұрын
Good science Dr Ollie. Enjoyed this. Can't subscribe as I'm already in but worth a thumbs up and a positive comment 🚴👍
@gcntech
13 күн бұрын
Liking the video and leaving a comment also helps us a lot, thank you 🫶
@johnnewington6635
14 күн бұрын
Remember a bike has 2 wheels and although the front wheel losses are likely to be different from the rear wheel losses, as an example, times the losses/gains by 2 and the magnitude of the effect becomes even more significant. Always amazed me in kids triathlons, which bike events are often run over very bumpy grass and parents who were road riders, would have their kids tyres pumped up super hard, poor kids!
@stevesimpson6021
13 күн бұрын
Now I need to throw a spanner in the works. What about hookless rims/tubeless which have a psi max of 72 (contin 5000)
@gurujoe75
8 күн бұрын
conti GP 5000 23/25c a regular clincher at 7.5/8 bar, front/back on a good asphalt.
@matt8094
14 күн бұрын
I couldn’t focus on anything but his sweatshirt, which only has one string coming out of it. Made it difficult to learn anything about tire pressures
@MikkoRantalainen
4 күн бұрын
Interesting results. I would love to see more testing to understand the road surface, pressure and tyre width combination better. And I would love to see actual gravel testing instead of cobbles but that cannot be done on a drum.
@bobnelson2828
14 күн бұрын
Great content!! More of this type would be appreciated.
@gcntech
13 күн бұрын
📝
@mee3sy
Күн бұрын
Fascinating subject. Extremely well presented. Thanks Ollie. I'm off now to let a bit of air out...
@skipcycle4580
14 күн бұрын
Or go to 18:06 and pause if you're in a hurry. I think I'll try 80 psi (5-10 psi lower) on my next ride and see how it feels. No mention of whether tire pressure should vary front to rear. Early 80's it was 105 psi with 20 width. Times have changed!
@Thezuule1
14 күн бұрын
Just use a tire pressure calculator
@lux-wattage
13 күн бұрын
Videos like this really get me excited! I’d love the chance to visit test facilities like this myself (especially alongside Ollie). If slightly heated tires offer performance benefits, do you think we might see 'tire warming' technologies in the future, allowing riders to start with optimal tire temperatures from the get-go?
@secureone22
12 күн бұрын
28 GP5000s at 80 psi for me.
@jeremynorth
12 күн бұрын
Excellent video Ollie. You are the best at all of this scientific stuff.
@leighhewitt5476
12 күн бұрын
Why are we accepting Watts down to the 0.00 decimal, yet using single diget Bar as the pressure difference. Why not psi for a more exact test result?
@fishyerik
8 күн бұрын
If you want higher resolution you can use parts of bars. Stating the exact precision of the measured the pressure is irrelevant in this context, maybe they adjusted the pressure to the stated number of bar, +/- a few millibars. But also, it's not that important, and, in a given volume and amount of air, pressure changes with temperature, so pressure is not constant, so unless you keep measuring the pressure, or temperature of the air, you won't actually know the pressure.
@nomadcarpenter8549
8 күн бұрын
1m is the same thing as 1000mm, provided its measured accurately
@greghilliard7641
6 күн бұрын
Christ I’m running 70psi on 40mm gravel tyres!! No wonder I’m bouncing around. Great vid! And yes more tech please 😊
@alexalderthay4346
14 күн бұрын
Would have been good to test 25mm tyres for all of us still riding rim brakes..
@johnmoruzzi7236
14 күн бұрын
And used PSI….
@piripiro
14 күн бұрын
More often than not, if your bike is rated for 25mm tires max it will still allow for 28mm too, no problem. I have an "old" (2016) rim brake canyon endurace, rated for 25mm tyres. I use 28mm on the daily and it works wonders.
@alexalderthay4346
14 күн бұрын
I tried and unfortunately 28's don't fit..@@piripiro
@stanlee-eq7lu
5 күн бұрын
Nothing wrong with rim brakes. As a matter of fact, in the long run they are easier to work with and more dependable. Just remember this. Disc brake maintenance on a bicycle is actually closely related to disc brake maintenance on a car. All the parts are the same, just at lower sizes. Bad caliper on a bicycle? After replacing it, there's something mandatory - you have to bleed the brake lines so there's no air in them before filling the master cylinder with the proper fluid then put the new pads on. You don't get these headaches with rim brakes. However if people want disc brakes on their bikes, that's their decision not mine.
@cesarers7372
6 сағат бұрын
No surprise that tyre pressure for Paris-Roubaix is one of the biggest secrets among the pro peloton teams.
@MisterE331
14 күн бұрын
What a joy to wake up and geek out on some bike research...can't believe we get this content for free!!!
@gcntech
13 күн бұрын
🗣Tickets please 👮♀
@fredeberlein
7 күн бұрын
Excellent report. Very helpful. My pressure has been too high at 7 bars... will test at 5 bars on next ride.
@kevingregoire1042
13 күн бұрын
2bars on 28c for a Roubaix or even average hard cobblestone has one huge problem… That the drum doesn’t recreates! The usual Potholes and protruding cobblestone odd edges every 10m-20m. Great content as often on theese topics !
@trep53
7 күн бұрын
This is fantastic stuff! The competitive cycling world is at a ridiculously high technical level these days. For all the miles of pro cycling I watched this summer it kept me interested. The advanced tech in cycling did that! However on my bike a universe away it’s a enjoyable physical pastime.
@Roger-tz5sy
14 күн бұрын
How about running the tyres hard enough so they don’t make a noise and soft so they don’t buzz on the surface you are riding on.
@derek75116
14 күн бұрын
You’re right, Intuition isn’t a bad thing ma man.. sometimes science and analytics is only justification for a job..
@joeshmoe7967
8 күн бұрын
For myself, I would be wary of running too low on the front tires, as it tends to wash out the front end in hard cornering. Over all good data is good to have, and can lead to the sweet spot. Different set ups for different conditions, seems like a normal way to look it things. Always interesting content. - Cheers
@timtaylor9590
14 күн бұрын
dylan johnson was right mountain bike tires for cobble road races
@PhilAndersonOutside
12 күн бұрын
Paul Sherwin used to say the same. If you're coming to Roubaix to ride the cobbles, bring a mountain bike!
@l.d.t.6327
7 күн бұрын
he's not right.
@kookamunga2458
3 күн бұрын
I set mine half ways between max and minimum and about five pounds less but only on the front. The five pounds less on front is to improve shock absorption and reduce fatigue in my arms but I realize it does reduce my speed slightly. I've noticed some tyre brands perform better at different pressures because of design differences and different rubber compounds and materials.
@10ktube
14 күн бұрын
Couple of things. First one, if pressures are this important, what is the most accurate and CONSISTENT way we should measure our pressures as normal riders at home? What's the go-to gauge for measuring? I'm going to guess if I took 3 different floor pumps, couple of mini pumps, my air compressor, etc, they'd all read differently. Second one, pros are drilling cobbles at way faster than 35k/h, their pressures are different than us noodling around. Plus some of those classics riders are heavier (most are). Thirdly - Dylan Johnson has been saying for years pros should be on 40-50mm wide tires for the cobbles, no one will do it, but after seeing this data, it's something to consider (different bike frame of course).
@derek75116
14 күн бұрын
What your saying makes obvious sense i would have thought..
@MrTeff999
14 күн бұрын
My floor pump over states the actual pressure by 18psi. I didn’t know until I bought a digital pressure gauge.
@_Tp___
14 күн бұрын
For the third point, maybe for cobbles that is the best option but most races with cobbles have significant amounts of smoother surfaces so mid 30s is probably the right way to go for them. I agree with your first point though, normal people just have to go off a track pump or something and kind of see if it feels the right pressure.
@MercuryDIY
14 күн бұрын
@@_Tp___exactly what I was thinking. tire choice has to consider the tarmac and cobbles. If you just take a 50mm tire to monster truck over the cobbles, then yeah it will be faster but on the tarmac the rider would suffer and be much slower than the group riding 32’s or 30’s
@jonathanzappala
14 күн бұрын
GCN made that video, a mountain bike, with mtb tires, is faster across the cobble sector. The thing is Paris Roubaix is a race mostly on regular roads.
@log_it8282
12 күн бұрын
Looking at casing tension would have predicted these results. Smaller tires = faster for equal casing tension (and comfort level!) as long as you're not too heavy for the road surface or the tire.
@sventice
13 күн бұрын
Love this nerdy content; please keep it going if you can! I'm currently running 32mm tires with TPU tubes on my road bike. According to the Silca calculator, I should be running my tires at 4.5 Bar (65psi) on paved surfaces. That's actually very squishy in my opinion. Instead, I run 5.5 Bar (80psi), which seems to be ideal: comfortable, smooth, but it doesn't feel like I'm riding through thick sand. OK, I don't actually run 80psi all the time. Most of the time, I'm not even sure what my tire pressure actually is. When I inflate my tires, I go up to 90 psi, sometimes even up to the recommended max of 100, and then don't mess with them for 2 weeks or more. The tires lose a couple of psi a day. For the first couple of days, they're honestly way too hard, sort of bouncy, which isn't good, but then they feel fine, and when they finally start to feel too squishy, which is at about 70 psi for me, I start over.
@onnoH96
13 күн бұрын
Same here! It creates some variety in the rides haha
@the_kingd0m
8 күн бұрын
Bad practice. Should just inflate tires before every ride. Just aim for between 60-80 or pumped before every ride. Tubeless tires lose a lot of pressure every day, very unpredictable
@TimothyTakemoto
8 күн бұрын
@@the_kingd0m "Bad Practice. Should..." Cycling is like a church.
@sventice
7 күн бұрын
@@the_kingd0m If I wanted to inflate my tires before every single ride, I would just use latex tubes.
@peterleffler2062
2 күн бұрын
Interesting stuff, good work👏 I suspect that in the cobble classics the road surface is rougher and far more variable. The cobbles are laid fairly roughly from the start (relative to Swiss tarmac) and are then punished by years of heavy farm traffic and neglect so there is no regularity in the surface in terms of up- bumps, down-bumps, exposed edges etc (hard to describe but I hope you get the gist). So that is perhaps part of the reason that the pros use a slightly higher pressure than your testing would suggest. It doesn't invalidate your results , like you said any results throw up more questions.
@TESTA-CC
14 күн бұрын
25c Tyres, Butyl Tubes, 7 Bar / 100 Psi. Road Only, No Issues, Rapid 🤙🤙
@fishyerik
8 күн бұрын
It seems to me most of the energy loss at higher pressures should be lost in the movement up and down, meaning, going fast enough to not "fall" [as much] between the pikes of the surface should reduce those losses. Also, standing up, instead of absorbing that movement with your body should also reduce the energy loss. It should also be more comfortable, and reduce the risk of pinching, and also reduce peak loads on some parts of the bike.
@johnnyloco11
14 күн бұрын
this is the content I live for.
@thegearboxman
6 күн бұрын
So in summary, for most of us plodding along at 25-30km/h on reasonable (but occasionally pot-holed) tarmac, tyre pressure makes precisely 2 parts of f**k all difference LOL. Besides, this test takes no account of the losses through the front tyre, nor does it consider what happens when you hit a pothole. I think I'll protect my carbon wheels by running the tyres a bit on the high side, plus I'll maintain some grip while cornering hard without the tyre rolling off the rim!
@helloweeny
14 күн бұрын
What's the ideal tyre pressure when the local roads have potholes the size of bowling balls?
@bluej511
14 күн бұрын
Save your money and move lol.
@brotherfranciz
14 күн бұрын
Why are you riding in a bowling alley?!
@vincent_dumont
14 күн бұрын
I guess you could buy a mountainbike with 54 mm tyres. And run those at 1.6 bar tubeless with a tyre insert. Or move out of the USA and come to the Netherlands.
@helloweeny
13 күн бұрын
All good suggestions 😂
@stanlee-eq7lu
5 күн бұрын
Potholes the size of bowling balls? Dude, your tax dollars aren't going to the DPW. They're for paying the yearly membership dues at country clubs for your politicians.
@leopichler
2 күн бұрын
Low tyre pressure is nice, but for cheap people - and students - high is better because less punctures in cities :)
@Al.2
14 күн бұрын
Good luck running 28's at 2 bar and not bottoming out.
@einundsiebenziger5488
14 күн бұрын
If you're over 70 kg body weight, at 2 bar, you'd bottom out just by sitting on the saddle. I don't even ride my MTB tyres at a pressure this low.
@Al.2
14 күн бұрын
@einundsiebenziger5488 I couldn't believe Ollie was advocating this with a straight face. I mean - wide rims, the drum with regular "cobbles", no high speed and he could (barely) get away with it. In a real-world scenario? Forget it.
@JK-yi9gk
14 күн бұрын
did he say what the ideal tire pressure for 25mm and 28mm tires for the average weight person? 23min is too long to keep my attention for a boring topic. Thank you
@patthewoodboy
14 күн бұрын
imagine what it would feel like going round a corner , wallow wallow
@newttella1043
14 күн бұрын
Ollie gets free rims. He can ride new rims for EVERY ride. Instead of fixing a flat, he gets a whole new wheel, so why wouldn't he ride at 2 bar???
@CaryCotterman
12 күн бұрын
My first mid-end road bike, long ago, had 1.25-inch (32mm) tyres, with a recommended pressure of 60 psi (4 bar). When I got some money, I switched to 20mm sew-ups running at 125 psi (8.6 bar), and the decrease in resistance and increase in speed were dramatic. Today I ride 23mm clinchers at 110 to 120 psi (7.6 to 8.3 bar). Sorry, I'm sticking with "old school", never going back to fat, soft tyres. Those are for paperboys. Yeah, I know, Tadej goes big and squishy and wins everything, but I suspect the advantage he has over me is probably down to something other than tyres.
@benedictearlson9044
10 күн бұрын
You just feel like you are going faster due to the vibrations, time yourself 5x on higher and lower psi on long rides and get back to us. Maybe you are heavy, in which case 120 could be your optimum.
@Alex-gl2dw
14 күн бұрын
Speed is good, but underinflating just to get a snake bite is much worse. Gotta take into account whether the tyre is clincher or tubeless.
@Al.2
14 күн бұрын
Are you actually ok with snake bites on tubeless? edit: I meant bottoming out.
@Alex-gl2dw
14 күн бұрын
@@Al.2 Are they a thing on tubeless? Snake bites are a tube thing, tyres don't even get punctured. There are no tubes in tubeless.
@brotherfranciz
14 күн бұрын
@@Al.2 The AI getting it wrong again.
@Al.2
14 күн бұрын
@Alex-gl2dw What about damaging the rim and/or the tire?
@keessonnema
14 күн бұрын
@@Al.2 Make me a sandwich
@Plasmo20
3 күн бұрын
What was the internal rim width? depends on the rim width vs tyre width. MTB tells us this. the relationship between internal rim width and tyre width is key to handling.
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