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Tubes are faster

Old 09-15-22, 03:12 PM
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Mojo31
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Tubes are faster

Well, tubes are faster. Says so right here -

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Old 09-15-22, 03:17 PM
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Does that factor in the time spent on the roadside fixing punctures?
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Old 09-15-22, 03:22 PM
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You don't have a support vehicle?
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Old 09-15-22, 03:27 PM
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Great. Some guy I never heard of conducts a n=1 test on youtube with no/poor experimental control, and the results are supposed to reflect anything other than one guys experience on one day? Why not skip the test and just assert his opinion? It'd carry the same weight.
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Old 09-15-22, 04:31 PM
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So TPU tubes at 120 PSI should be more popular??
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Old 09-15-22, 04:33 PM
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Originally Posted by datlas View Post
So TPU tubes at 120 PSI should be more popular??
That's what I run, even on my beach cruiser.
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Old 09-15-22, 04:42 PM
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I believe him. Lookkit the size of his melon - he must be smart!
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Old 09-15-22, 05:07 PM
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He weighs 200 pounds. 120 psi is not extremely high for his weight. The bike path looked smooth. The same tires, tubeless at 72 psi might be way too low for him. Tube might very well be faster in this instance, maybe not in others.
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Old 09-15-22, 06:10 PM
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Originally Posted by WhyFi View Post
I believe him. Lookkit the size of his melon - he must be smart!
He needs every advantage he can get, rocking an aerobeard like that. It's like how a giant tail is a setback for a peacock, only the strongest ones can pull it off. Dude must be using red tubes to be fast enough to have a beard like that.
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Old 09-15-22, 06:29 PM
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Originally Posted by seypat View Post
That's what I run, even on my beach cruiser.
black wall or white wall ?
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Old 09-15-22, 06:34 PM
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Originally Posted by Jack Tone View Post
He weighs 200 pounds. 120 psi is not extremely high for his weight. The bike path looked smooth. The same tires, tubeless at 72 psi might be way too low for him. Tube might very well be faster in this instance, maybe not in others.
agree - 200 lb riding skinny clinchers @ 72 psi would be an invitation for snake bite punctures
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Old 09-15-22, 07:08 PM
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Originally Posted by WhyFi View Post
I believe him. Lookkit the size of his melon - he must be smart!
He also did a YouTube video and works in a bike shop.

Good beard, too.
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Old 09-15-22, 07:53 PM
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I quit watching when I saw the valve caps.
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Old 09-15-22, 08:01 PM
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Originally Posted by t2p View Post
black wall or white wall ?
Please!


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Old 09-15-22, 08:05 PM
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Originally Posted by Mojo31 View Post
The dude looks like an axe swinging, height challenged person from the Hobbit in post #1
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Old 09-16-22, 12:17 AM
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Might as well have made a video of himself running 72psi on a tubed setup and getting a pinch flat. Would have been just as informative.
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Old 09-16-22, 04:27 AM
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120 psi on our rough local roads would be a non-starter for me. It's plenty bad enough running 60 psi tubeless. His roads looked super-smooth so hardly a shock result here.
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Old 09-16-22, 05:05 AM
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Not comparing tires at the same pressure what's the point of that? I mean... "I'm running a tubeless setup at about 72 psi" - well, what do you expect? That's too little for a narrow tire.

When you use normal hooked tubeless rims and just ride tubeless at 90-100 psi (or whatever is appropriate for your weight) tubeless tests faster than any tube type bar latex in every single test, all things being equal. Hookless tubeless wheels which are limited to 72,5 psi don't make any sense with anything thinner than a 28mm tire, and even that is going to be a bit low pressure wise for most riders if you're looking for maximum speed on a decent road surface.
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Old 09-16-22, 07:00 AM
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Originally Posted by Branko D View Post
Not comparing tires at the same pressure what's the point of that? I mean... "I'm running a tubeless setup at about 72 psi" - well, what do you expect? That's too little for a narrow tire.

When you use normal hooked tubeless rims and just ride tubeless at 90-100 psi (or whatever is appropriate for your weight) tubeless tests faster than any tube type bar latex in every single test, all things being equal. Hookless tubeless wheels which are limited to 72,5 psi don't make any sense with anything thinner than a 28mm tire, and even that is going to be a bit low pressure wise for most riders if you're looking for maximum speed on a decent road surface.
I think it's relative. I'm running a hookless & TL setup here on 28mms @ 70PSI back & 65PSI front. I weight 165lbs.

Tried 75 and 80 (not recommended, I know), and I prefer 70. The part of the rear tire that touches the tarmac does not deform (flatten?) very much when my arse is on my saddle. I could probably go even lower without any significant increase in RR.
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Old 09-16-22, 07:12 AM
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Originally Posted by PeteHski View Post
120 psi on our rough local roads would be a non-starter for me. It's plenty bad enough running 60 psi tubeless. His roads looked super-smooth so hardly a shock result here.
Still over-inflated IMO even if his roads are smooth and he is a fattie. He would probably have a more comfy ride and same speed (or even higher) at 100 PSI. 120 should be saved for the velodrome.
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Old 09-16-22, 07:29 AM
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Originally Posted by datlas View Post
Still over-inflated IMO even if his roads are smooth and he is a fattie. He would probably have a more comfy ride and same speed (or even higher) at 100 PSI. 120 should be saved for the velodrome.
On 25s for a heavy guy on a good road Silca suggests that about 100 is ideal for going fast. Pump manometer being off by 10 psi at 120 psi wouldn't be unheard of; mine is off by 7-8 psi at 100 psi - so 120 psi on his pump could be fairly close to ideal. We don't know.

However, tubeless 25s on 72.5 psi (or if the pump is off, "somewhere under 70 psi") is definitely way below ideal for a guy of 200 lbs.

The corollary of that is that hookless wheels with 72.5 psi limit and tires below 28c just don't make sense as a combination and even those are borderline on good surfaces. I'm fortunate to have plenty of them.

​​​​​
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Old 09-16-22, 07:41 AM
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Originally Posted by Branko D View Post
On 25s for a heavy guy on a good road Silca suggests that about 100 is ideal for going fast. Pump manometer being off by 10 psi at 120 psi wouldn't be unheard of; mine is off by 7-8 psi at 100 psi - so 120 psi on his pump could be fairly close to ideal. We don't know.

However, tubeless 25s on 72.5 psi (or if the pump is off, "somewhere under 70 psi") is definitely way below ideal for a guy of 200 lbs.

The corollary of that is that hookless wheels with 72.5 psi limit and tires below 28c just don't make sense as a combination and even those are borderline on good surfaces. I'm fortunate to have plenty of them.

​​​​​
I won't argue your point.

One of my pet peeves, though, is cyclists who think the MAX pressure on a tire is the IDEAL pressure. Rarely is that the case, at least for clinchers.
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Old 09-16-22, 07:47 AM
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Geraint Thomas in his Podcast once said he was typically running approx 75 psi on his Contis. Those guys ride pretty fast.
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Old 09-16-22, 07:50 AM
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Likely more off-topic drivel, but I cannot tell you how many novice cyclists I know who brag about their new fancy carbon fiber frames and say how smooth and comfortable it is compared to their aluminum frame, but they are pumping their tires up to 115PSI. You will do much better (and save a crap-ton of $$$$) if you stay with that aluminum frame and just drop your PSI down to 80 or 90.

/end rant
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Old 09-16-22, 08:05 AM
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Originally Posted by datlas View Post
I won't argue your point.

One of my pet peeves, though, is cyclists who think the MAX pressure on a tire is the IDEAL pressure. Rarely is that the case, at least for clinchers.
This was mostly the case for 23mm tires which were faster on 8 bar, roughly their maximum allowed pressure. The conventional wisdom wasn't wrong during the days of very narrow tires.

https://www.researchgate.net/publica...sure_Influence

What happened in the meantime is that rims and tires both got wider, and a wider tire at the same pressure is effectively stiffer, meaning the optimal pressures went down, while maximum allowed on a 25mm tire is still around 110 psi. So the old ways don't make sense on 25mm tires, and even less on 28mm, but at one point, they did.
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