jersey68l36

The '68's came with F70-15's 7 inch wide wheels as most on the C3 forum are aware, actually mine originally had Uniroyals, white stripe.

Trying to fit a spare in the carrier, in case the Corvette is actually need to be used as a short term driver and the question is what is the modern day alternative to the ancient F70,? 205-70X15?

Also noticed that the later 8 inch wheels will not fit in the carrier, so I guess the '69 up were deeper.

Thanks for any responses.

Easy Mike

I've had a 15x8 wheel and tire in my 68's tub with no problems.

You should be okay with 205s or 225s. I have 70R225s on my 68.

Rotonda

You should be able to adjust the depth of the spare tire tub by lower the two mounting bolts in the rear (front of car) that form the pivot for lowering the tub, allowing the use of an 8 inch wheel.

bashcraft

I believe 215-70R15 equates to an F70-15 but 225's would fit as well.

Paul Borowski

.....to me, IMHO, the 215/70 is the perfect replacement size. The 225s on the '68-'72 are a little too large, not much, but they are. I even measured original F70 tires and the closest size is the 215/70.
...the 225s are a better replacement sizewise for the GR70-15 tires found on '73-'77 Corvettes.

jersey68l36

Thanks for the responses.

215-70X15 is most likely the replacement size for the old F70's.

It was a while ago, but it seemed like no dice trying to fit just an unmounted 15X8 back in place in the carrier. I'll check it out again. As I recall, the pivoting bolts toward the front have a short threaded length, but maybe only need a washer on each side to get the clearance.

7T1vette

The tire tub is adjustable on 'depth' with the two inboard bolts being backed out as needed, and the locknut run up to lock them in place.

Most C3 folks find that the R60 series radial tires handle better and look better than the R70 series. A '68 can handle up to 235 width without having any front tire rubbing issues. Some can handle more, but it's a 'crap shoot' with more than a 235 tire on the front. I would also suggest 8" wide rims, unless you are going the NCRS judging route.

jersey68l36

There's actually, 235-60's up front and 275-60's out back BFG/TA's on 8 inch. This '68 has not been stock since the first pair of Hooker side mounts were installed back in '72. I think before the radials, there were bias belted G60's front and J60's rear.

Justed wanted some thing in-place as a spare, as the regular driver is going off the road, and may need to press this hobby car as a back-up.

Thanks