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Tire Pressure

Old 06-06-22, 09:45 PM
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rclouviere
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Tire Pressure

I know there are a lot of opinions on tire pressure, but Iíd like to get some opinions. I want to be as fast as possible on my road bike (conti tubeless) and my TT bike (conti clincher). Iívelooked at the silcachart and it seems to be pretty accurate?
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Old 06-06-22, 09:50 PM
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cxwrench
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You're kidding, right? This is the most beat down dead horse of a topic that has been discussed hundreds of times but you're going to crack into it yet again...but not provide any info about your or your equipment? Really?
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Old 06-06-22, 10:10 PM
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Lots of people will tell you that wider tires at lower pressure are just as fast if not even faster than thin tires pumped up hard. Its bollocks, the fastest tires are narrow and pumped hard. The ideal PSI depends on your body weight and preferred riding style. Some people prefer less pressure to roll over imperfections in the road smoother, some people prefer the harsh ride of a rock hard tire, its really up to you.
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Old 06-06-22, 10:11 PM
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OP, what's your opinion on tire pressure? (you started it)
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Old 06-06-22, 10:12 PM
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A lot of top racers us the Silca info so it will be as good as any info anyone puts up here or on any public forum. The only extra thing you could do is check with the manufacturers of your tires to see if for some reason they need different pressures than those of other manufacturers. Let us know what they say..........
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Old 06-06-22, 10:14 PM
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Get a Garmin or something similar and see what works for you.
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Old 06-07-22, 02:18 AM
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Smooth road surface high pressure is fast,rough road bigger tire with lower pressure,actual pressure level put your bodyweight into the scale,there is nothing to discuss about,also carbon spoke wheelset is the future road wheelset with instant response fast acceleration
https://www.elite-wheels.com/drive-c...okes-wheelset/

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Old 06-07-22, 04:10 AM
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PeteHski
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Originally Posted by rclouviere
I know there are a lot of opinions on tire pressure, but Iíd like to get some opinions. I want to be as fast as possible on my road bike (conti tubeless) and my TT bike (conti clincher). Iívelooked at the silcachart and it seems to be pretty accurate?
Use the Silca chart as your baseline then. There are too many variables to perfectly optimise your tyre pressure for every occasion anyway. Looking to maximise speed I would perhaps go a little higher than recommended pressures unless the road surface was rough. In which case I would go a little lower.
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Old 06-07-22, 06:13 AM
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I run my Veloflex 700 x 23C's at 140 psi on smooth pavement. Works for me.
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Old 06-07-22, 07:06 AM
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I use the tire pressure calculator at zipp.com. It works for me. Tubeless tires at much lower pressures is what I use.
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Old 06-07-22, 07:11 AM
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trial & error for the rear tire
5-10psi lower for the front tire

​​​​​​​I believe air resistance/drag & weight, will have a greater effect on your speed
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Old 06-07-22, 07:29 AM
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Experiment. Rinse, Repeat.
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Old 06-07-22, 08:35 AM
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Originally Posted by LarrySellerz
Lots of people will tell you that wider tires at lower pressure are just as fast if not even faster than thin tires pumped up hard. Its bollocks, the fastest tires are narrow and pumped hard. The ideal PSI depends on your body weight and preferred riding style. Some people prefer less pressure to roll over imperfections in the road smoother, some people prefer the harsh ride of a rock hard tire, its really up to you.
Larry...just stop it. They're not the suggestions of physics, or the feels of physics, they're the LAWS of physics.
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Old 06-07-22, 08:42 AM
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Low pressure has more rolling resistance because at the tangent point ( just before road contact), you are flexing the tire material to a higher angle than a tire at a very high pressure.
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Old 06-07-22, 08:47 AM
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Here is an idea. Run your own experiment. Create a Strava segment on a longish downhill that will take at least a couple minutes to roll down without pedaling. Next start at low pressure and run down the segment a few times. Add pressure and repeat. Any RR difference will show up as an average time difference.

The reason I think that this is a divisive topic is that inflation pressure isn’t that important for speed. It’s down in the noise and difficult to measure a true diffence. Otherwise, if there was a large difference there would be universal consensus on what pressure to run.

Then run the pressure that feels the best to you and you don’t get pinch flats or blow the tire off the rim. There is no wrong pressure. (There, I said it)
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Old 06-07-22, 10:26 AM
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I have found this site tremendously helpful when it comes to pressures. Just feed in your data. https://silca.cc/pages/sppc-form
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Old 06-07-22, 02:21 PM
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Originally Posted by Daniel4
Low pressure has more rolling resistance because at the tangent point ( just before road contact), you are flexing the tire material to a higher angle than a tire at a very high pressure.
You have no clue. Go join Larry somewhere else.
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Old 06-07-22, 02:31 PM
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Originally Posted by LarrySellerz
Lots of people will tell you that wider tires at lower pressure are just as fast if not even faster than thin tires pumped up hard. Its bollocks, the fastest tires are narrow and pumped hard. The ideal PSI depends on your body weight and preferred riding style. Some people prefer less pressure to roll over imperfections in the road smoother, some people prefer the harsh ride of a rock hard tire, its really up to you.
Way more to it than that, Larry. https://www.renehersecycles.com/myth...ure-is-faster/

Don't you have a seat post to weld, remove, lower... break? Oh, and you honesty don't know what you are talking about.
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Old 06-07-22, 02:41 PM
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ofajen
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Originally Posted by rclouviere
I know there are a lot of opinions on tire pressure, but Iíd like to get some opinions. I want to be as fast as possible on my road bike (conti tubeless) and my TT bike (conti clincher). Iívelooked at the silcachart and it seems to be pretty accurate?
Sorry, Iíll pass on the opinions but hereís the explanation of the Silca calculator along with a good discussion on the overall topic of rolling resistance of tire casings, the impedance of surfaces and how they interact.

https://silca.cc/blogs/silca/tire-pr...ator-explained

Otto
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Old 06-07-22, 04:59 PM
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rclouviere
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Originally Posted by ofajen
Sorry, Iíll pass on the opinions but hereís the explanation of the Silca calculator along with a good discussion on the overall topic of rolling resistance of tire casings, the impedance of surfaces and how they interact.

https://silca.cc/blogs/silca/tire-pr...ator-explained

Otto
perfect. Thanks
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Old 06-07-22, 05:06 PM
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Originally Posted by cxwrench
You're kidding, right? This is the most beat down dead horse of a topic that has been discussed hundreds of times but you're going to crack into it yet again...but not provide any info about your or your equipment? Really?
not on here much. Here goes: Iím 6í, 160+ pounds, have a madone and emonda set up tubeless with conti 5000 tires TLR and a TT bike, speed concept with conti 5000 clincher tires. All tires 25 mm

discussion came when another cyclist, known to be an annoying know it all, made the statement that anyone with tubeless tires who still inflated to 100 psi is an ďidiot.Ē I said i was that idiot. He went in to say i should have wider tires (i have 25mm) and run them around 70psi. There were varying opinions.

bottom line is Iím 65 years old, but still trying to keep up with the youngsters, and need every speed advantage i can get.
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Old 06-07-22, 05:09 PM
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Originally Posted by Outrider1
OP, what's your opinion on tire pressure? (you started it)
Iíve always run at least 110psi. ďFeelsĒ faster to and how itís always been for me. Lower psi just seems slower. I know thereís been lots of testing on this, but Iím just not sure now. The silica chart indicates i should be around 95psi
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Old 06-07-22, 05:10 PM
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Originally Posted by smd4
I run my Veloflex 700 x 23C's at 140 psi on smooth pavement. Works for me.
Ew, David.
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Old 06-07-22, 05:11 PM
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rclouviere
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Originally Posted by LarrySellerz
Lots of people will tell you that wider tires at lower pressure are just as fast if not even faster than thin tires pumped up hard. Its bollocks, the fastest tires are narrow and pumped hard. The ideal PSI depends on your body weight and preferred riding style. Some people prefer less pressure to roll over imperfections in the road smoother, some people prefer the harsh ride of a rock hard tire, its really up to you.
I donít care about comfort, only going faster.
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Old 06-07-22, 05:11 PM
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Originally Posted by rclouviere
I donít care about comfort, only going faster.
Smooth is fast. Fast is smooth.
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