View Full Version : Best F/R Pressure On The Street


ss346ci
12-17-2008, 12:26 AM
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?

Bird Man
12-17-2008, 08:14 AM
They shouldn't be wearing in the middle at that pressure.

kdavis
12-17-2008, 09:57 AM
i keep a little more pressure in the front than the rear, due to the front haveing more weight on the tires.

ss346ci
12-17-2008, 11:20 AM
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.

cookba
12-17-2008, 03:14 PM
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.

Xsta Z 28
12-18-2008, 08:55 AM
32 ish . . .

NC01TA
12-18-2008, 10:09 AM
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.

ss346ci
12-18-2008, 11:07 AM
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.