Tire Pressure Question
Thread Starter
Pro
Joined: Jan 2004
Posts: 516
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From: Long Island ny
St. Jude Donor '06-'07
Tire Pressure Question
I know that the door sticker says 30 PSI cold, but does anyone know what cold temperature is supposed to be?
I filled the tires this morning to 29 PSI when it was 55 degrees. After siting in the sun the pressure was up to 31 PSI and after driving at 60 mph for 30 minutes the pressure was 33 PSI. Outside temp was 63 degrees.
Sound normal?
I filled the tires this morning to 29 PSI when it was 55 degrees. After siting in the sun the pressure was up to 31 PSI and after driving at 60 mph for 30 minutes the pressure was 33 PSI. Outside temp was 63 degrees.
Sound normal?
Le Mans Master
Joined: Oct 1999
Posts: 8,205
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From: Tucson AZ
Sounds normal; pressure changes with temperature. I always set mine to 32 psi and have to change it as I drive into colder sections of the country. I set the pressure in Tucson before our current trip, and now have 27 lbs. here in cold Illinois. 
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Yes, tire pressure will go up with differences in outside temp and through driving the car. I would just set the pressure at 30 psi before driving the car.
Safety Car
Joined: Feb 2004
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From: monroeville pa
St. Jude Donor '04-'05-'06-'07-'08-'09-'10-'11-'12-'13
I put mine at 30 psi but when i get in the car the dic always will show me 29 even though i know i put 30 in because i always check with my tire gauge i don't think the sensors on the tires are perfect.
Race Director
Joined: Dec 2003
Posts: 10,387
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From: Chicago Burbs, IL
St. Jude Donor '03 & '06
Originally Posted by JDs00PewterCoupe
Yes, tire pressure will go up with differences in outside temp and through driving the car. I would just set the pressure at 30 psi before driving the car.
Tire companies will tell you always follow the door tag. Don't worry about outside temperatures and tire temperatures, just follow the tag.
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Le Mans Master
Joined: Nov 2001
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From: Central Coast CA
As others have stated, cold tire pressure means the temp the tires are from not driving it, usually before the first drive of the day. Tires heat up after driving them and thus so does the pressure inside them. Tire pressure ratings take this into account. So a 30psi rating might end up being 35psi or more after a long drive.
Pro
Joined: Mar 2004
Posts: 675
Likes: 0
From: Talty TX
Biggest concern for the runcraps is too high pressure in the rear, they will quickly wear out the centers. 30psi COLD is good. Monitor the tire wear across the tires every couple of months and adjust the pressure accordingly...
Good luck and enjoy the new ride,
Dave
Good luck and enjoy the new ride,
Dave
