Topic: Tire Size
in Forum: C3 Handling Components
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I'm pretty sure the 225/70-15 is the standard size. An optional size on the later C3's was 255/60-15. The 255's seem most common from what I see.
I have the 225's on my '79. I went with them to not have to deal with fitment issues.
I'm sure others will weigh in on this.
Kevin
Rick in '78 I believe they changed the wheel wells to fit the 60 series tires. The earlier cars used the 70 series tires. Some say you can use the 60s on the earlier models but you may have to trim the wheelwell.
Barry
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Canada
Joined: 3/9/2008
Posts: 164
Vette(s): 70 VETTE 350/300HP, AUTOMATIC, ALL STOCK EXCEPT FOR MILD CAM,LAGUNA GREY, 3:55 POSI GEARS
I put 255/60/15 in the rear and 245/60/15 in the front. People have told me 255 in the front will be to close to the wheelwell. If you hit a pump while you are turning the tire can hit the top of the wheelwell
causing big repaires to the body
causing big repaires to the body 
I have 255/60/15 on all 4 corners of my Vette. All works well even in tight turns.
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"It Takes A Little Longer To Do It Right"
"It Takes A Lot Longer To Do It Again"
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Oak Creek, WI - USA
Joined: 5/21/2008
Posts: 1965
Vette(s): 1981 Great White Shark. Red Interior, 350/190 hp. PS, PB (SS), A/C CC, T-Tops. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vettes Car Club. 175,000 Original miles!! Now own a 1998 C-5!
My 81 Has the Goodyear 225 70 R 15 front and back. Good riding tire. If your gonna hit a bump, do it streight on !!!!
dskopp 2010-03-29 19:22:09
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
1968-1972 used F70-15...todays's reference size is P215/70R15.
1973-1978 used GR70-15...today's reference size is P225/70R15.
1978-1982 used P225/70R15 with P255/60R15 as optional.
60-series tires will fit some pre-'78 cars on a car by car basis. Some have had clearance problems, some haven't.
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
My '71 big block car has 255/60/15s all around. It also has freshly rebuilt suspension and new springs, which makes a big difference.
Larry
Larry
Lifetime MemberManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
I too have the 245/60s on the front of the wifes car and 255s all around on my '81, but ours are all newer types cars so,.......no issues with these sizes.
Jimmy B.
Just can't wait to get on the road again. 
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Lusby, MD - USA
Joined: 10/18/2003
Posts: 56
Vette(s): 1981 WHITE ALT WITH ALL THE BELLS
My tire guy say 225/75r15 are way better. There 1/4 inch taller. He says its got stronger side walls. I havent tryed them yet. I have 255/70r15 now. there BF Goodrich. There way better than the junk the car had when I got it.
in Forum: C3 Handling Components
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