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Old 01-27-2013, 11:19 PM   #1
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propper tire pressure

What should the proper tire pressure for daily driving on the Cooper STT 295/70R17 tires I just installed? They seem to hop when hitting bumps not drastic but noticeable. I checked the pressure and the 2 drivers side are at 38.5, the front passenger is at 39, and the rear passenger is 32. I will get them all the same just not sure what would be the best for normal driving. Also if you let go of the wheel it seems to have a gradual pull to the drivers side could the pressure diff be causing this? the alignment was perfect before the new wheels and tires.

Thanks in advance.

Dave
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Old 01-28-2013, 08:35 AM   #2
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Wow I thought this would have had the typical all across the board range of answers. I am thinking about trying 30 psi for now. I would try the "Chalk Test" but I feel it would not work very good on the currently snow covered streets.

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Old 01-28-2013, 09:07 AM   #3
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I run my 315 75 16 around 25-29#...
My buddy runs his 37 70 15 around 27#
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Old 01-28-2013, 04:30 PM   #4
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Quote:
Originally Posted by shadowglenn View Post
Wow I thought this would have had the typical all across the board range of answers. I am thinking about trying 30 psi for now. I would try the "Chalk Test" but I feel it would not work very good on the currently snow covered streets.
Bigger tires take less pressure; 38 PSI is way too high for a 33" aftermarket tire. That's probably why you feel em hopping. The one tire that's 32 is closest...that's what I'd try first. Go with 32, drive it, and if it's still a little squirrely go down to 30 PSI.

As a rough guide, 33" tires will need about 30-32 PSI; 35" tires around 28-30, etc.

If you've got a really thin layer of snow, you can do a rough kind of chalk test with that, by seeing how much of your tire coverage shows up...
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Old 01-28-2013, 04:36 PM   #5
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Quote:
Originally Posted by kbwwolf

Bigger tires take less pressure; 38 PSI is way too high for a 33" aftermarket tire. That's probably why you feel em hopping. The one tire that's 32 is closest...that's what I'd try first. Go with 32, drive it, and if it's still a little squirrely go down to 30 PSI.

As a rough guide, 33" tires will need about 30-32 PSI; 35" tires around 28-30, etc.

If you've got a really thin layer of snow, you can do a rough kind of chalk test with that, by seeing how much of your tire coverage shows up...
^This. I run my 33's at 32 psi an almost all the tread touches the pavement
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Old 01-28-2013, 10:37 PM   #6
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Thanks All. I am gong to drop them all to 32 and see how it rides.

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