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What is the Right Tire Size

Posted: 7/15/08 6:19pmMessage 1 of 14

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jp75vette

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Bloomfield Hills, MI - USA

Joined: 6/29/2008

Posts: 199

Vette(s): 1975 Corvette coupe, 4 speed manual, 383 ci 9.5:1,Edelbrock dual plane Air Gap intake, Alum Heads,Comp Cam, roller Rockers, PS,PB,Tilt

My 1975 Corvette has P235 60R 15 raised white letter tires on the front and AP295 50R 15 raised white letters tires on the rear. The car sits high and I'm looking to get a conventional ride height and also closer to normal size tires on the vehicle. Originally it came with G70R 15 tires, but I'm not concerned with keeping the car 100% original. The wheels on the car come from a 1976-1979 Corvette (I believe) and are 8" wide (see photos).

Photo #1 Photo #2

Any recommendations on proper tire size?

(large photos modified to clickable links - Norsky)

Norsky2008-07-17 20:13:01

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What is the Right Tire Size

Posted: 7/15/08 6:31pmMessage 2 of 14

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KDADDY79

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Dutchess County, NY - USA

Joined: 8/27/2007

Posts: 2484

Vette(s): White '79 Corvette. It's a driver.

There are two commonly used sizes.

225/70-15 & 255/60-15

I have the 225's but it seems like most folks use the 255's, from what I've seen.

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What is the Right Tire Size

Posted: 7/15/08 6:58pmMessage 3 of 14

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cthulhu

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Hot Springs, AR - USA

Joined: 4/24/2004

Posts: 3236

Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans

I concur about the 2 sizes and the preference for 255/60

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What is the Right Tire Size

Posted: 7/15/08 7:19pmMessage 4 of 14

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ebo

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Holland Patent, NY - USA

Joined: 6/3/2008

Posts: 4422

Vette(s): #1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Sizes as stated are correct, go to any sight like tire rack and they have a drop down for your car with sizes and makes. You also can compare side by side.

Click on image for larger view!
LIFETIME MEMBER 151

ebo

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What is the Right Tire Size

Posted: 7/16/08 9:20amMessage 5 of 14

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steves74

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Klamath Falls, OR - USA

Joined: 2/1/2006

Posts: 1062

Vette(s): 74 coupe 4 speed 350, 54K actual miles, all original; paint, interior, engine, split bumper. #'s match. 2nd owner, no stress cracks.

You might find this tire chart helpful Tire Dimension Guide

Steve, Lifetime Member #129

74 coupe 4 speed 350, 54K actual miles,
all original; paint, interior, engine,
split bumper. #'s match. 2nd owner, no stress cracks.

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What is the Right Tire Size

Posted: 7/16/08 10:17amMessage 6 of 14

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fp_vetter72

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COPPERAS COVE, TX - USA

Joined: 7/6/2002

Posts: 475

Vette(s): 1972 corvette stingray convertible 2007 coupe

I run 255/60-15 on my 72 keeps the speedo right

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What is the Right Tire Size

Posted: 7/16/08 12:25pmMessage 7 of 14

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sundew

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Eagan, MN - USA

Joined: 6/18/2007

Posts: 468

Vette(s): Gone, but not forgotten: 1974 Coupe Red, matching numbers, Black Interior, L-48 w/ 4 speed; The “Admiral”, also gone and never to be forgotten. 1994 Admiral Blue LT-1 coupe, Black Interior Automatic

I run 225/70-15 B.F.G. TAs on my car. I had read on this website a while back that there could be clearance issues with older C3's and 255 section tires. Since my car is a '74, I decided to go with 225/70-15s. I also did not want to reduce the ride height and invite clearance issues with my exhaust system. Circumference is also important for speedometer accuracy. Although Corvette and accurate speedometer in the same sentence seems to be an oxymoron.

sundew2008-07-16 12:28:09

There is no substitute for low end torque!