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Pastimes : Auto Repair & Maintenance Tip

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To: Jon Khymn who wrote (1)	11/1/1999 5:45:00 PM
From: SI Bob	Read Replies (3) of 134

New site posting test: We bought a Honda minivan two months ago. We upgraded the tires to wide body with 44 PSI. That's an awful lot of pressure for a car tire. That's the exact pressure I use in the right front on my Mustang for road course use. And that's a racing tire, at that. My truck uses 90, but I'm more accustomed to seeing mid 30's for a passenger car tire. I don't know what low-profile tires usually take (is that what you're using?) but it would seem reasonable to expect higher pressure in those to help keep the rims off the ground. I checked the air pressure today and all 4 tires were only at mid 20s psi. Most likely way too low. If they were all at 44 at some point and are all now 20, it's most likely due to a temperature change. If your tires are at 44 immediately after some spirited driving on a hot day, they could conceivably show mid 20's on a cold day before the car's been driven. Especially, I would think, a low-profile tire, which doesn't hold much air to begin with, comparatively speaking. I always just inflate them to the maximum shown on the sidewalls. But it's got to be done cold. Hot temps are very unreliable. A tire that's underinflated will run much hotter than a properly inflated tire (more tire flexing equals more heat equals higher pressure) and can actually show a higher pressure when hot than a correctly inflated tire will. Kinda worried if I put too much air... Personally, I worry about underinflation more, although severe overinflation can cause problems, too.

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