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Old 08-14-2011, 10:59 AM   #21
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Quote:
Originally Posted by DF5.4 View Post
It's 1 pound per 10 degrees
Pretty good rule of thumb.

Goodyear narrows it down a bit more - 2% per 10 degrees F [top of page 6]


As for absolute temperature, Bridgestone finds temps ~60 degrees greater than ambient, and over 200 is bad (for truck tires). Unfortunately,they also note that a handheld gauge provides the least reliable readings.
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Old 08-14-2011, 11:06 AM   #22
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What exactly are you measuring? You can measure tire tread temperature easily. You need a sensor in the tire to measure the air temperature in the tire.
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Old 08-14-2011, 01:47 PM   #23
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this past week i was going to check the pressure and tire temp early in the morning then as the sun baked them (while sitting). soon realized that i couldn't do it that way because part of the tire wasn't exposed to the sun. also found that the temp gun readings would vary even on the outside of the tire.
memory doesn't work very well for me. what i really remember abt the pressure and temp on my tires is that if one was in an alarm state, after a few miles it would gain enough pressure to satisfy the alarm.
thought the previously stated temp and pressures were what i observed. in looking at pressure changes and season changes, the pressure doesn't change very much.
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