TommyG67

I'd like to put as larger a set of rear tires on '67 GTO (currently have 225/70-15's). I am using 15 x 7 Rallye II wheels. Does anyone know if 245/60-15 or 255/60-15 tires will work OK on the rear? Front is lowered ~2" and has 225x60-15's.

SANDU002

With the stock backspace they will not fit. You will need at least 5" backspace. I have 225/60/15 7" rallye II on the back of mine and they are fine.

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67 Post Coupe,
69 RA III Judge
06 BOM, M6, 18's

novafreak69

I am doing some work on a nice 1967 GTO Post car...
the guy wants a stage 2 Hotchkis suspension under it and rear disc brakes...
Problem is that it has stock 14x6 Ralleye II wheels on it and the SSBC brakes that I put on the rear rub. So I am going to upgrade the wheels with some 15" Ralleye IIs. Just wanted to see if anyone has done any 15X8 wheels on one... and what the backspacing was... I could always go with a 15X7... but still would like to know what backspacing... want to do a 235/60 15... Any input on the matter would help me out a lot. Thanks in advance.

TommyG67

Hi, novafreak69

I now have 245/60 X 15's on the rear of my '67, mounted on 15x7 Rally II's. The wheel backspacing is 4 1/2" and the tire fit is very close on the outside - inside is fine. I had wanted 255/60x15's, but 245's are the widest recommended size on 7" rims, so the best solution would be new 15x8 wheels with a 5" backspacing.

TommyG67

Continued response to novafreak69 -
While getting to the point where I am, I looked into whether I might get the 15x7 Rally II's widened to 7 1/2 or 8". That got me looking into where the interference would be with 255's. At first I thought it was the lip at the wheel opening in the fender - figured that I could do some carefull trimming back to reduce the flange from 1+ inch down to ~3/4" and it would be OK. Upon further review..... there is a part of the inner fender wheel 2 - 3" above the opening that curves in toward the center of the car and back out again - a sort of formed bulge that is probably there to stiffen the fender well(?). I entertained the idea of slitting this area - pounging it flat (or at least less of a bulge) and re-welding. Decided against all of the above, but thought I'd share...
By the way - my car is now lowered ~1" in front with front discs and 225/60x15's. The rear has 1" spacers under old springs, so I'm about 1/2" high at the back.

gjones

I run 245 60 r15's Rally II 7's all the way around on our '66 Lemans convertible- stock drum brakes, new springs. No issues, no rubbing. G.

novafreak69

is that with a 4" backspace?

novafreak69

TommyG67...

I would like all the wheels and tires to be the same size so that he can rotate them. I am not sure what the standard BS on a 7" Rally II is... I am leaning towards a 235/60/15 on a 7" Rally II BUT... the current 14"X6" rally II are pretty close on the outer lip in thee back... and I do not want to change the stance of the car or cut on it...

bobby326

On my 67 lemans be fore the rebuild I had 15x8 weld pro stars. 225/15 on front with a 4.5 bs on front and a 275/60/15 drag radial on the rear with a 5 or 5.25 (not sure have to measure again) on the rear. The only difference is I have a 68/69 12 bolt which is about a 1.5 inches wider than a stock 10bolt so my backspacing would be a little more. But it's possible to fit a wider tire with the right bs. Going to buy myself new wheels for Xmas. Prob ridler 695 245/45/18 front with 4.5 bs and 275/40/18 with 5.5 bs on rear. Going to put the body on the frame on sat to double check the measurements for the rear to make sure they fit.

Too Many Projects

Running 275x60x15 on vintage 15x7 rally's. No clearance issues at all...

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Mitch
1967 GTO; Gulf Turquoise on Black, 4 speed bench, basket case
1967 Camaro ss/rs 350...driver
1966 Chevelle SS 396...driver
1970 Chevelle SS 396...basket case
1952 Chev 2 ton flat bed...future car hauler
1938 Chev coupe...street rod