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tire psi

Old 09-02-10, 08:58 AM
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Gts24
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tire psi

hey all,

rather new to the sport and coming from a road background i've had the tendency to over inflate my tires. i'm riding entry level clinchers at about 50psi (i'm 160 lbs). i was wondering what others were riding at about the same weight?

greg.
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Old 09-02-10, 09:33 AM
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Cynikal
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For racing I run my tubulars from 28-35 depending on the course. For clinchers you need to run higher due to pinch flats but I found that using tubes with removable valve cores and sealant worked well at low pressures. Also, remember to use a talc between your tire and tube, this will help reduce pinch flats too.

Go out to a field with an extra tube and pump and experiment with your pressure.
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Old 09-02-10, 09:49 AM
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Sounds to me at 160 you could probably go lower then that. What does the tire sidewall say? If it gives you a range then use the lowest.
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Old 09-02-10, 10:14 AM
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At 150lbs I race with my Tubulars at 25-32psi. With my clincher training wheels, just riding fireroads I run 40psi.
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Old 09-02-10, 12:18 PM
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I also made the roadie mistake of running too high a pressure. I think I rattled a couple of teeth out during my first race.

I'm 170 lbs and race my clinchers around 40psi.

Read somewhere that the formula was around 25% of your weight. Someone else can confirm/refute that, but seems to work for me.
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Old 09-02-10, 03:16 PM
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There's no magic number. Too many variables, even beyond rider weight. Weather, riding surface, tire volume, etc. 50 psi (or more) could be great for smooth, dry pavement, but riding a muddy CX course with 35mm tires would probably suck.

Wet, slippery surface = lower pressure*
Smooth, dry surface = higher pressure
Bumpy surface = lower pressure*
Large volume tire = lower pressure*
Lower rider weight = lower pressure*
* although not so low that you pinch flat

Experiment and decide what's best for you in each situation.
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Old 09-03-10, 09:20 AM
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If you have the $70 to drop, I would highly recommend converting to tubeless with the Stan's kit. You can run your tire pressure nearly as low as on tubulars. Standard tubes and CX just don't mix.
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Old 09-03-10, 09:24 AM
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OP, you never said where were riding or if you are planning on racing at all. Terrain and intended use would inform recommendations here.
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Old 09-03-10, 10:50 AM
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i'm going into my second year of racing and i'll be seeing a wide range of conditions. northeast races range from all grass to all mud with some single track thrown in for good measure. i'm mostly just worried about pinch flats because i've fallen victim to a few running at 40psi on my clinchers. but it sounds like that's pretty standard for most racing on clinchers. i just need to learn how to not ride my bike like a sack of anvils.

cheers, and thanks for the advice.
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Old 09-03-10, 02:52 PM
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I think pinch flats are an urban legend. I weigh nearly 200 pounds, and last year I ran my clinchers as low as 30 psi without flatting. I powder my tubes and use 700x28-35 tubes.

Now, of course, I expect to flat immediately on my first race this year.
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Old 09-03-10, 05:17 PM
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Originally Posted by Andy_K View Post
I think pinch flats are an urban legend. I weigh nearly 200 pounds, and last year I ran my clinchers as low as 30 psi without flatting. I powder my tubes and use 700x28-35 tubes.

Now, of course, I expect to flat immediately on my first race this year.
Oh you most definately jinxed it!
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Old 09-03-10, 06:55 PM
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I was 220, and there were races where I prayed for a pinch flat... But nothing.
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Old 09-03-10, 07:29 PM
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Originally Posted by gfactor View Post
I was 220, and there were races where I prayed for a pinch flat... But nothing.
LOL. I know the feeling.
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