Tubes are faster
Well, tubes are faster. Says so right here -
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Does that factor in the time spent on the roadside fixing punctures?
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You don't have a support vehicle?
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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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So TPU tubes at 120 PSI should be more popular??
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Originally Posted by datlas
(Post 22648576)
So TPU tubes at 120 PSI should be more popular??
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I believe him. Lookkit the size of his melon - he must be smart!
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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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Originally Posted by WhyFi
(Post 22648587)
I believe him. Lookkit the size of his melon - he must be smart!
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Originally Posted by seypat
(Post 22648578)
That's what I run, even on my beach cruiser.
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Originally Posted by Jack Tone
(Post 22648609)
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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Originally Posted by WhyFi
(Post 22648587)
I believe him. Lookkit the size of his melon - he must be smart!
Good beard, too. |
I quit watching when I saw the valve caps.
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Originally Posted by t2p
(Post 22648679)
black wall or white wall ?
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Originally Posted by Mojo31
(Post 22648507)
Well, tubes are faster. Says so right here -
WHAT IS FASTER? *TUBE'S OR TUBELESS?* (POWER METER TEST!!) - YouTube |
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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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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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. |
Originally Posted by Branko D
(Post 22648958)
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. 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. |
Originally Posted by PeteHski
(Post 22648948)
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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Originally Posted by datlas
(Post 22649052)
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.
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. |
Originally Posted by Branko D
(Post 22649073)
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. 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. |
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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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 |
Originally Posted by datlas
(Post 22649091)
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. 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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