Cold PSI
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Pole Position
Joined: Jun 2010
Posts: 264
Likes: 1
From: az
Cold PSI
Just wondering what others run their non run flat tires at??
I got michelin pilot a/s plus and run them around 37.
Tire says max 51
Also I'm at about 4000 ft elevation.
Opinions as to optimal psi?
I got michelin pilot a/s plus and run them around 37.
Tire says max 51
Also I'm at about 4000 ft elevation.
Opinions as to optimal psi?
Intermediate
Joined: Jul 2010
Posts: 473
Likes: 33
From: CA
The front door says to inflate to 33 PSI and I'm assuming this PSI is at sea level. Correcting 33 PSI at sea level to 4,000 ft, would about a 2 PSI decrease, or 31 PSI. I run the same tires at around 34 PSI at, or around sea level, give or take a few feet.
Last edited by sixonemale; Sep 16, 2011 at 07:54 AM.
The suggested pressure has nothing to do with elevation. As you have said you lose external pressure as you go up. This means that the internal pressure will go up proportionally. So, going up you let air out. Not add it, to maintain the 33 lb. suggestion.
Intermediate
Joined: Jul 2010
Posts: 473
Likes: 33
From: CA
Agreed, for about every 1,000 feet of elevation atmospheric pressure decreases by about a half pound.
Pole Position
Joined: Feb 2007
Posts: 2,090
Likes: 10
From: NM
If you inflate your tires at sea level then drive to a higher elevation, your tires will be overinflated and you'll need to let air out. But if you inflate your tires at elevation, they'll be correct. You don't need to make any adjustments.
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