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Best F/R Pressure On The Street

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Old 12-17-2008, 12:26 AM   #1
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Default Best F/R Pressure On The Street

I have a 2000 SS with 275/40zr17 kumho ecsta asx tires all around on the stock 17x9 ZR1s, and after taking a wheel/tire combo to hibdon's for a flat repair, I noticed that the rears are both wearing more in the center signaling an overinflated condition. I run all four corners at 30psi as per the gm sticker. What's the best rear pressure for the street?
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Old 12-17-2008, 08:14 AM   #2
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They shouldn't be wearing in the middle at that pressure.
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Old 12-17-2008, 09:57 AM   #3
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i keep a little more pressure in the front than the rear, due to the front haveing more weight on the tires.
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Old 12-17-2008, 11:20 AM   #4
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Default Pressure

I think that the F/R weight balance on our cars is 57/43 or 58/42 so that would require less air pressure in the rear tires than the front. Since 30 psi has delivered even wear in the front, I expect that less pressure would deliver the best results in the rear.
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Old 12-17-2008, 03:14 PM   #5
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i have ran 32 front and 30 rear on my KDW tires the past 2 years with no issue. I think my next tires i will try 32 front and 28 rear.
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Old 12-18-2008, 08:55 AM   #6
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32 ish . . .
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Old 12-18-2008, 10:09 AM   #7
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Quote:
Originally Posted by ss346ci View Post
I have a 2000 SS with 275/40zr17 kumho ecsta asx tires all around on the stock 17x9 ZR1s, and after taking a wheel/tire combo to hibdon's for a flat repair, I noticed that the rears are both wearing more in the center signaling an overinflated condition. I run all four corners at 30psi as per the gm sticker. What's the best rear pressure for the street?
No way should there be a problem at 30 psi. Get a new quality tire gauge and see the probable difference. Some cheap gauges can be way off.
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Old 12-18-2008, 11:07 AM   #8
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I have a "quality" camel tire gauge and I have tried a snap on gauge at my dads shop which corresponded with my dial gauge. With almost 60% of the 3500 lbs over the front axle, the rear tires will definately need a few psi less to wear evenly. I'm just going to mark tht top of the tread with chalk and alter pressure until the wear is even across the tread surface.
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Old 12-18-2008, 11:07 AM
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