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      10-26-2011, 10:23 PM   #1
flagger
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Tire Temps

I know summer tires are compounded to work best in environments above 45 - 50 degrees, and winter tires in environments below 45 degrees. My question is this:

When the car is driven, the tires heat up due to sidewall and tread flex. Is the heating sufficient to eventually bring the tire up to a more normal temp in cold weather?

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      10-27-2011, 08:36 AM   #2
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At the margins, yes, the summer tires will grip a little better after they are warmed up. So the most dangerous time in cold weather is right when starting out. But the further you go below the ideal ambient temps, the further the warmed-up temperature gets from the ideal operating temperature.

The temperature recommendations already account for the fact that tires warm up, so for normal road use one could not expect to start very far below the recommended temperature range and bring the tire up to an ideal operating temperature.
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      10-27-2011, 08:47 AM   #3
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Even if the carcass is warm the summer tire/race tire compound won't have nearly as much adhesion in the cold as it does above its normal temperature range. The temperature of the outer surface of tire tread is effectively at road surface temp plus or minus some heat transfer contribution from the bulk temperature of the tread and outside air. Because summer tire compound become very rigid when they get cold (lots of internal resistance to deformation) there is less stick because the surface of the tread can't deform. This is one of the reasons why right now in October with the ground still relatively warm a summer tire isn't all that spooky even when it's 30 degrees out, but in the dead of winter after a month of average temps at or below freezing, even on a 50 degree day it's still spin city

You can observe this phenomenon with a probe pyrometer if you leave your tire sitting in one place after coming off track. Take a measurement of the tread where it is exposed to air and the probe will measure at the internal temperature, roll the car forward and probe the contact patch that was touching the ground with the car stopped and it will take about 20 seconds for the temperature to re-stabilize. Of course it all happens much faster and less extensively as the tire is rolling but the first thousandth of an inch of tread is the most important thousandth
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Last edited by Richbot; 10-27-2011 at 08:58 AM.
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      10-27-2011, 02:18 PM   #4
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Quote:
Originally Posted by SehrSchnell View Post
Temperatures are in their upper 30's, lower 40's my tires feel like hockey pucks right now...
yeah my ad08s did too so switched out to my stock ps2s for winter. not ideal but better.
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      10-27-2011, 03:17 PM   #5
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Thank you all.
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