Proper front to back diameter ratio for R888's?
08-20-2007, 04:01 PM
#1
Pro
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Proper front to back diameter ratio for R888's?
Trying to determine what combination of R888's will fit best on my stock C6 wheels.
Stock GY Runflats have a diameter of 25.7 front, 26.9 rear, a difference of 1.2 in front to back.
The R888's I'm looking at are their 245/40/18, @25.7in front, and 295/30/19, @26.0 rear, a difference of only .3 front to back. Will that much ratio difference mess up the AH in the computer?
Edit: oops, my bad, looks like the 255/35/18 be a better choice for the fronts @25.1 in?
fyi, here's Toyo's sizing chart:
http://marktg.toyotires.com/file/30029.pdf
Stock GY Runflats have a diameter of 25.7 front, 26.9 rear, a difference of 1.2 in front to back.
The R888's I'm looking at are their 245/40/18, @25.7in front, and 295/30/19, @26.0 rear, a difference of only .3 front to back. Will that much ratio difference mess up the AH in the computer?
Edit: oops, my bad, looks like the 255/35/18 be a better choice for the fronts @25.1 in?
fyi, here's Toyo's sizing chart:
http://marktg.toyotires.com/file/30029.pdf
Last edited by Goodwood; 08-20-2007 at 04:24 PM.
08-20-2007, 04:41 PM
#2
Burning Brakes
Member Since: Apr 2005
Location: River Vale, NJ & Ft. Myers, FL
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St. Jude Donor '09-'10
I just ordered and received a set of 4 245/40/18s for my CTS-V (Im not trolling--I also have a C6Z). Found the best prices were at Frisby--$285 each.
I'll break them in at Watkins Glen on Sept. 4. I'll be happy to let you know how I like them.
BTW, I spoke to a technician at Toyo and he told me that even though the R888s are uni-directional, you can rotate from side to side (as long as you don't drive them in the rain). So they should last longer.
I'll break them in at Watkins Glen on Sept. 4. I'll be happy to let you know how I like them.
BTW, I spoke to a technician at Toyo and he told me that even though the R888s are uni-directional, you can rotate from side to side (as long as you don't drive them in the rain). So they should last longer.
Last edited by sefa01; 08-20-2007 at 04:44 PM. Reason: more info
08-23-2007, 04:49 PM
#4
Melting Slicks
Trying to determine what combination of R888's will fit best on my stock C6 wheels.
Stock GY Runflats have a diameter of 25.7 front, 26.9 rear, a difference of 1.2 in front to back.
The R888's I'm looking at are their 245/40/18, @25.7in front, and 295/30/19, @26.0 rear, a difference of only .3 front to back. Will that much ratio difference mess up the AH in the computer?
Edit: oops, my bad, looks like the 255/35/18 be a better choice for the fronts @25.1 in?
fyi, here's Toyo's sizing chart:
http://marktg.toyotires.com/file/30029.pdf
Stock GY Runflats have a diameter of 25.7 front, 26.9 rear, a difference of 1.2 in front to back.
The R888's I'm looking at are their 245/40/18, @25.7in front, and 295/30/19, @26.0 rear, a difference of only .3 front to back. Will that much ratio difference mess up the AH in the computer?
Edit: oops, my bad, looks like the 255/35/18 be a better choice for the fronts @25.1 in?
fyi, here's Toyo's sizing chart:
http://marktg.toyotires.com/file/30029.pdf
If anyone see's any problems with my worksheet, let me know.
Last edited by Poppy's Vette; 08-23-2007 at 04:53 PM.