C-3 tire size

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Dec 20, 2011 | 08:41 AM

Kendog

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C-3 tire size

I am look for the correct tire size for a 1975 corvette with stock 8" rally wheels. I have been to several tire outlets and I get different answers. What are you running?

Dec 20, 2011 | 08:49 AM

24695bob

Burning Brakes

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From: Frederick Md

All I know is that I will never go with 60 series tires again... 235x70's fill out the rear fenderwells much better then the 60's....

Bob G
64 72 & 98 Convertibles
76 79 88 (35th anc) Coupes

Dec 20, 2011 | 08:55 AM

Easy Mike

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From: Southbound

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GR70-15s were stock. 225R-15s would be close.

Dec 20, 2011 | 11:43 AM

gbvette62

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From: Shamong, NJ

Quote:

Originally Posted by Easy Mike

GR70-15s were stock. 225R-15s would be close.

The GR70-15 was the OEM size. Tires went to metric sizing in 1978, and the GR70 designation was replaced with P225/70R-15.

The metric sizing is still in use today, so P225/70R-15 is still the correct replacement size, for your 75's original GR70's.

Dec 20, 2011 | 04:24 PM

Roughrider

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From: Frederick Maryland

60-series tires weren't an option until 1978 when the body panels were modified for clearance.

Dec 20, 2011 | 05:10 PM

Tim H

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From: Southern Indiana

A 237/70 was a small suv truck tire if thats what you want.
If you won't go 255/60s that fit your car than get the right size 225/70s.

Dec 20, 2011 | 05:36 PM

larrywalk

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From: St Louis MO

Both 225-70-15 and 255-60-15 are within 1/4" of the same diameter, but the 255 has a 1 inch wider section width.

Dec 20, 2011 | 07:18 PM

leadfoot4

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From: Western NY

Quote:

Originally Posted by larrywalk

Both 225-70-15 and 255-60-15 are within 1/4" of the same diameter, but the 255 has a 1 inch wider section width.

That is indeed correct, but the OP said original size for his '75 car. The 255/60s, as previously mentioned, were not available until 1978, and I believe first available on the Indy pace cars.