Tire size help???
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3rd Gear
Joined: Jul 2002
Posts: 3
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From: laconia nh
Tire size help???
I recently purchased a new set of ZR-1 style wheels for my '94. They are 17X9.5 on all four corners w/56mm backspacing. My car currently has the stock 8.5 and 9.5 wheels, with 255/45 front and 285/40 rear.
I know that the grand sport ran a 9.5 inch wheel with a 275/40 on the front, but an 11 inch wheel on the back.
Has anyone ever run the 9.5 wheels on all four corners, and if so, which tire size did you use? Unfortunately, my rear tires are new, just don't know why they wear out so fast!
Any input would be appreciated!
I know that the grand sport ran a 9.5 inch wheel with a 275/40 on the front, but an 11 inch wheel on the back.
Has anyone ever run the 9.5 wheels on all four corners, and if so, which tire size did you use? Unfortunately, my rear tires are new, just don't know why they wear out so fast!
Any input would be appreciated!
Melting Slicks
Joined: Oct 2000
Posts: 2,491
Likes: 1
From: prescott AZ
For best handling with a 9 1/2" wheel go the way GM went when they wanted max handling - a 275x40x17. It will handle better than the slightly larger 285x40x17 due to the rim being slightly more over the thread, less side wall flex, lower center of gravity, less unsprung weight.
Melting Slicks
Joined: May 2003
Posts: 3,490
Likes: 68
From: Hewitt NJ
Originally Posted by skeet
For best handling with a 9 1/2" wheel go the way GM went when they wanted max handling - a 275x40x17. It will handle better than the slightly larger 285x40x17 due to the rim being slightly more over the thread, less side wall flex, lower center of gravity, less unsprung weight.
Safety Car
Joined: Oct 2003
Posts: 3,597
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From: TN PA
CI 5-6-7-8-9-10-11 Vet
I have 9.5 in. ZR1's on all four with 275/40's. I bought the Yokohama AVS ES 100's....Great tire, quiet, good bite at the strip, and neat tread pattern....Also with 275/40's on all four You can rotate them front to back.
Last edited by pettvette; Jan 15, 2005 at 12:39 PM.
Drifting
Joined: Jun 2002
Posts: 1,305
Likes: 11
From: Savannah Ga.
Originally Posted by skeet
For best handling with a 9 1/2" wheel go the way GM went when they wanted max handling - a 275x40x17. It will handle better than the slightly larger 285x40x17 due to the rim being slightly more over the thread, less side wall flex, lower center of gravity, less unsprung weight.
just curious why did they go to a slightly larger rear tire? 
Melting Slicks
Joined: May 2003
Posts: 3,490
Likes: 68
From: Hewitt NJ
Originally Posted by redcorvettedave
just curious why did they go to a slightly larger rear tire? 
