GR70 15 new tire match
#1
Advanced
Thread Starter
GR70 15 new tire match
i know corvette went to a 225 70 15 in 78 which replace the GR70 15. a lot of people say that that size work for the FR70 15. my car has HR60 15 right now which would be about a 255 60 15, looks good but for ncrs judgeing would a 235 70 15 or a 245 70 15 be a closer match for the GR70 15 than the 225 70 15.
The following users liked this post:
glbarn (02-15-2020)
#5
Race Director
i know corvette went to a 225 70 15 in 78 which replace the GR70 15. a lot of people say that that size work for the FR70 15. my car has HR60 15 right now which would be about a 255 60 15, looks good but for ncrs judgeing would a 235 70 15 or a 245 70 15 be a closer match for the GR70 15 than the 225 70 15.
If you have H series tires on your car currently and drive the car at all, I would find a replacement for them soon. As you state, P-metric tires have been in use since 1978, which makes your H series tires are 30 years old. Tires older than 10 years are usually not concidered safe for use at highway speeds.
Last edited by gbvette62; 01-31-2010 at 10:06 PM.
#6
Team Owner
An "F" width tire is equivalent to a 215 mm for a radial tire. "G" is 225; "H" is 235....etc. You can spend big buck$ on stock "looking" tires from one of the specialty tire outfits...but the date codes, etc. won't be correct so that is probably overkill. 60 series tires look better on the C3 Corvettes, anyway. Just put RWL, 235R60-15's on it and get docked a few points. It'll look , won't it?
#7
Advanced
Thread Starter
yes the tires on my car been on her since before 1980 i was looking at tire rack and they said a p225 70 15 for the GR70 15 and a P205 70 15 for the FR70 15. i know that in 78 the changed vettes to 3 options a P225 70 15, P255 70 15 and a P255 60 15. i think my HR60 15 are close to the p255 60 15. for looks i would do a P255 60 15 but for showing i think i'll go with the P225 70 15 thanks for the opions.
#8
Race Director
yes the tires on my car been on her since before 1980 i was looking at tire rack and they said a p225 70 15 for the GR70 15 and a P205 70 15 for the FR70 15. i know that in 78 the changed vettes to 3 options a P225 70 15, P255 70 15 and a P255 60 15. i think my HR60 15 are close to the p255 60 15. for looks i would do a P255 60 15 but for showing i think i'll go with the P225 70 15 thanks for the opions.
Strangely enough, the 78 sales brochure lists a P225/60R15 white lettered tire as the optional tire, but this is a misprint. The only optional size tire offered was the 255/60, not a 225/60, the option code for this tire was QBS.
#9
Advanced
Thread Starter
my car is a 77 i was using the 78 tire sizes to try to match up something i got the 3 different tire sizes from c3 corvette land which had the 2 sizes u said + a P255 70 15 white letter which could be a misprint i guess it should be P225 70 15 white letter ok thanks
#11
'76's Tires
[B]I have been using 255/60-15's for about twenty years.
They look virtually stock, and have a good footprint.
But even these are getting harder to get.
Hummm........I wonder if my Camaro's 20"ers will fit.......
They look virtually stock, and have a good footprint.
But even these are getting harder to get.
Hummm........I wonder if my Camaro's 20"ers will fit.......
#12
Instructor
Member Since: Nov 2010
Location: Hampton Fl.
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
St. Jude Donor '11
Whats up with that??
#13
2nd Gear
Member Since: Dec 2016
Location: New Hyde Park NY
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
225/70R-15 -won't fit in my '69 spare holder
An "F" width tire is equivalent to a 215 mm for a radial tire. "G" is 225; "H" is 235....etc. You can spend big buck$ on stock "looking" tires from one of the specialty tire outfits...but the date codes, etc. won't be correct so that is probably overkill. 60 series tires look better on the C3 Corvettes, anyway. Just put RWL, 235R60-15's on it and get docked a few points. It'll look , won't it?
I'm wondering why you recommend the 235R60-15. It may look right on he car but I doubt it will fit in the spare tire tub. I just purchased a new G225/70R-15 and mounted it on a new 15x8 rallye rim, and my '69's spare tub won't close. I 'd measured the old Goodyear GR70-15 that's still on the original spare rim, and it's section width measured 8-7/8". When I checked the 225-70R-15 specs, it shows a 9" section width. However, the mounted and inflated dimension shows 10". So I'll have to deal with either replacing the tub hanger bolts, or adjusting them - if they have the thread length.