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Old 06-30-2015, 08:42 AM   #1
Classax
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Tire Pressure Consensus Question, NOT the one youíre thinking

There are at least half a million threads about tire sizes, brands and which respective pressures it is recommended to run. Iím not asking about that.

My question is much more general. I understand that lowering the tire pressure allows the carcass to flex more and generate more heat. Assuming that you want to keep the tires in particular optimal temperature range, am I correct in assuming that GENERALLY speaking:

as ambient and track temperatures rise we could/should raise the cold pressures slightly ( a lbs or two) to keep the tires from overheating and becoming greasy.

as ambient and track temperatures fall we could/should lower the cold pressures slightly in order to ensure the tires come up to and remain at temp and donít cold tear
.

Is that GENERALLY correct?
Anyone want to shed a little more light on the subject of what to do with tire pressure as the track heats up or cools down during the day, or what to do with tire pressures for fall/springs vs mid summer track days?

Thanks
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Old 06-30-2015, 08:55 AM   #2
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Correct. As for changes throughout the day with temperature variation, you can buy a pyrometer and measure tire temp immediately after you exit the track. You'll want a probe to measure the temp under the surface of the tire.

You can then adjust tire pressures to keep the temps in your preferred operating range.

Longacre also makes a temperature compensated tire pressure gauge of you really want to get techie. I have a memory pyrometer but not a temp compensated gauge.
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Old 06-30-2015, 09:33 AM   #3
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I would definitely recommend getting a tire pyrometer if you're having issues with tires tearing. It was recommended to me by Whoop and it has already paid off for me. I kept tearing up tires and going thru them quickly because I couldn't figure out the right pressures to run. I now just check my tire temps with the pyrometer after a session out to see where I'm at and make adjustments from there. My tires are feeling a lot stickier too now that I am running them in the correct temperature range. I bought the same one that Dave Moss recommends in the thread below. Its a good thread to read thru regarding tire temps.

http://pnwriders.com/threads/tire-te...e-moss.183660/
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Old 06-30-2015, 03:04 PM   #4
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I listen to what hutch says for tire pressures and then adjust them based on what the tire looks like after coming off the track. Generally if I keep the pressures on the warmers stay the same all day and it works. Though out the day the pressures on the warmers will rise so I let some air out to keep them at the same pressure.
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Old 06-30-2015, 03:24 PM   #5
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I listen to what hutch says for tire pressures and then adjust them based on what the tire looks like after coming off the track. Generally if I keep the pressures on the warmers stay the same all day and it works. Though out the day the pressures on the warmers will rise so I let some air out to keep them at the same pressure.
Yeah, air expands and contracts in direct relation to temperature. If the pressure increases too much because of overheating, air should be added to the tire to bring the temp back down.
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Old 06-30-2015, 03:32 PM   #6
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I guess that's a better way to say it as a general rule of thub-

Add air if the tire is getting too hot
release air if the tire is staying too cold
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Old 06-30-2015, 04:37 PM   #7
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I don't really ever adjust my pressures during the day to make up for track temp. Once I find a good setting that works its works throughout the day. I am not running track record paces though. Proper suspensions settings have a great deal to do with tire wear and tear and should be addressed as well. You have the theory of pressures correct, most of us track mortals won't need to keep adjusting the tire pressures all day though.
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Old 06-30-2015, 05:49 PM   #8
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Find a good suspension guy, and you're half way there.

Listen to the tyre vendor for a range. Each bike varies depending on hardware. Each rider varies depending on habits and skill set.

I was told 5 years ago to go 32/26 on Pirelli. 5 years on, I run 31/24 off the warmers and don't look at it again.

Your results will vary.....
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Old 07-01-2015, 10:31 PM   #9
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You are correct. As temps go down, let out air. That will build heat in the tire.

But, All that really matters is hot, aka on track, temp. Regardless of cold temp setting, there is an optimal temp for the tires to hit the perfect PSI in steady state hot conditions. In relation to cold temp, the change in cold temp PSI will equate to a relative change in hot temp PSI. Lowering cold temp setting will lower hot temp PSI. Tire flex will not cause an under inflated tire to exceed the pressure of an over inflated tire when run in steady state hot conditions. How could it? Conditions in the tire will stabilize.

For reference, in terms of PSI versus temp...

Tire Pressure Consensus Question, NOT the one youíre thinking

Car tires. But, 2psi creep in PSI for about a 20 degree change in ambient temperature.
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Old 07-02-2015, 05:33 AM   #10
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For the street, I set cold tire pressure during the hottest part of the day, the day before I ride.
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Old 07-05-2015, 05:06 PM   #11
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I use nitrogen to minimize the moisture and help maintain a more stable temp.
I have a nitrogen generator available at home if anyone is interested in trying...

Air compressors don't do a very good job of keeping the moisture out of the air system.
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Old 07-05-2015, 06:34 PM   #12
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Air compressors don't do a very good job of keeping the moisture out of the air system.
Especially in Houston, but I wear tires out so fast it's not really an issue, plus I usually just use a bike pump instead of my compressor
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