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Old 06-15-2009, 12:05 AM   #1
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what psi do you fill the tires up to....

mine came with 15 inch tires, now i have 17's which i got from tirerack. what should the psi read on these?

what do you all infalet them too. each tire right now is at a different psi
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Old 06-15-2009, 12:06 AM   #2
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30psi.
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Old 06-15-2009, 12:11 AM   #3
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any confirmation on that?

what if it is too low or high? does it affect performance?

and thr front and rears should be different, right??

Last edited by URgfWaNtSME12; 06-15-2009 at 12:11 AM. Reason: Automerged Doublepost
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Old 06-15-2009, 12:15 AM   #4
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Wait? Fuck.. Tires have boost?

I run 31psi in the front and 33 in the rear..

Should be around 32.

More than 32 = uneven wear (more wear in middle of tires) and potentially better gas mileage..

Less than 32 = uneven wear (more wear on outer parts of the tires) and potentially better traction..
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Old 06-15-2009, 12:19 AM   #5
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Look on the door jam of your car, there should be a sticker that says what the company recommends. I run mine at 32psi but that's me.
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Old 06-15-2009, 12:21 AM   #6
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Quote:
Originally Posted by white07ls View Post
Look on the door jam of your car, there should be a sticker that says what the company recommends. I run mine at 32psi but that's me.
my door is for 15.. i have 17
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Old 06-15-2009, 12:46 AM   #7
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It doesn't matter how big the tire is. 30psi is still 30psi. PSI = Pounds per Square Inch of tire. There's just more air in the 17" to make it 30psi. Go with what GM says it should be at - that's what your alignment is set for and all that magical voodoo.
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Old 06-15-2009, 01:02 AM   #8
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sidewall will tell you on the tire.. or i think it does? back me up anyone?
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Old 06-15-2009, 01:08 AM   #9
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That's the maximum inflation pressure.
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Old 06-15-2009, 01:09 AM   #10
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Quote:
Originally Posted by silver06cobalt View Post
sidewall will tell you on the tire.. or i think it does? back me up anyone?
Yeah it should.

I usually go about 35 psi for normal driving... and fill to about 41 psi for autocross.
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Old 06-15-2009, 01:09 AM   #11
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sidewall will tell you max pressure, not recomended pressure. the door tag will tell you the recomended pressure for the factory installed tires. things like tire compound, sidewall stiffness, ect effect what the ideal tire pressure is.

the best thing, start with 32psi and keep an eye on treadwear
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Old 06-15-2009, 01:10 AM   #12
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That's maximum inflation pressure. aka, how much pressure the tire can handle.
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Old 06-15-2009, 01:13 AM   #13
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Ahh thats right.. I just went to look haha..

Carry on
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Old 06-15-2009, 02:54 AM   #14
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Put your front tires at 30-32, and your rear tires at the rating on the sidewall. Just be wary, your car will be ass sliding happy!

I don't count since I run 16's (and 15's in the winter), but I run 38 PSI up front and 29 in the rear. Neutral handling FTW (and yes, it took a LOT of time to find that out, and several tanks of gas. The guys working at the 76 station got worried that I had a bad tire, and were going to recommend tire places, until I told them I was driving up and down the side of a mountain spiritedly to find the best air pressure for handling).

If it was a Ford, you would have to automatically add 10 PSI to whatever is on the placard in the door sill. Otherwise, your tires will catch on fire and you will die when your car pops a tire on the freeway, and you roll 12 times into the oncoming lane and get TBoned, in the roof, by a Semi. That is assuming it didn't catch on fire before you could even get in it and drive it.
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Old 06-15-2009, 07:27 AM   #15
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Max psi if you want your sidewalls and tires to be happy. Otherwise you WILL wear out your tires faster.
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Old 06-15-2009, 10:47 AM   #16
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Quote:
Originally Posted by Chad92 View Post
It doesn't matter how big the tire is. 30psi is still 30psi. PSI = Pounds per Square Inch of tire. There's just more air in the 17" to make it 30psi. Go with what GM says it should be at - that's what your alignment is set for and all that magical voodoo.
Actually it does and it depends more on the TIRE you're running than the rim size. My dad's old Chevy Silverado 2500 came with crummy rims and cheapo highway only tires, so he swapped them out for a set of nice American Racing Atlas rims and some BFG All-Terrain tires of the same size. The stock tires recommended being aired up to something like 70 psi because they're designed for heavy towing. His BFG's were only rated to go up to like 45 psi.
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Old 06-15-2009, 10:59 AM   #17
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check what your tires say and dont go over that. start in the middl eabout 30 to 35 psi then if you car feels a bit twitchy and doesnt go straight down the highway drop pressure a bit and try again.
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Old 06-15-2009, 10:59 AM
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