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Topic: What is the Right Tire Size

in Forum: C3 Handling Components


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What is the Right Tire Size

Posted: 7/15/08 6:19pm Message 1 of 14
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 6:31pm Message 2 of 14
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.



What is the Right Tire Size

Posted: 7/15/08 6:58pm Message 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
 
 



What is the Right Tire Size

Posted: 7/15/08 7:19pm Message 4 of 14
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ebo
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Holland Patent, NY - USA
Joined: 6/3/2008
Posts: 4421
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.



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LIFETIME MEMBER 151
Evil Smileebo

What is the Right Tire Size

Posted: 7/16/08 9:20am Message 5 of 14
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steves74
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Klamath Falls, OR - USA
Joined: 2/1/2006
Posts: 1059
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.

What is the Right Tire Size

Posted: 7/16/08 10:17am Message 6 of 14
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fp_vetter72
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COPPERAS COVE, TX - USA
Joined: 7/6/2002
Posts: 417
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 12:25pm Message 7 of 14
sundew
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Eagan, MN - USA
Joined: 6/18/2007
Posts: 427
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!


What is the Right Tire Size

Posted: 7/16/08 4:03pm Message 8 of 14
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tinbender
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edgwood, MD - USA
Joined: 11/1/2007
Posts: 736
Vette(s): 1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.
What came on the 75 wasG70x15 steel belted radial's. I agree with everyone else on the two sizes.I have 225/70-15's on mine and it rides fine.
     Rick



What is the Right Tire Size

Posted: 7/17/08 2:25pm Message 9 of 14
jp75vette
Former Member
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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
Did you have to make any modifications for clearance, or did the tires fit with the stock setup? Which brand tires do you have?


What is the Right Tire Size

Posted: 7/17/08 7:54pm Message 10 of 14
KDADDY79
Former Member
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Dutchess County, NY - USA
Joined: 8/27/2007
Posts: 2484
Vette(s): White '79 Corvette. It's a driver.
Like mine, your Corvette does not have the front spoiler.
You should be just fine with the 255/60-15's.
 
I have the BFG T/A's. I'll buy 'em again when the time comes.
 
Some members have had good things to say about the Firestone Indys.
 
 



in Forum: C3 Handling Components


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