'67 GTO rear tire size - Pontiac GTO Forum
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post #1 of 20 (permalink) Old 01-11-2010, 11:42 AM Thread Starter
 
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'67 GTO rear tire size

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.
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post #2 of 20 (permalink) Old 01-11-2010, 12:17 PM
 
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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.


67 Post Coupe,
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06 BOM, M6, 18's
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post #3 of 20 (permalink) Old 12-16-2012, 11:17 AM
 
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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.
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post #4 of 20 (permalink) Old 12-16-2012, 12:39 PM Thread Starter
 
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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.
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post #5 of 20 (permalink) Old 12-16-2012, 12:49 PM Thread Starter
 
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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.
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post #6 of 20 (permalink) Old 12-16-2012, 05:11 PM
 
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tires

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.
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post #7 of 20 (permalink) Old 12-17-2012, 10:53 AM
 
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Originally Posted by gjones View Post
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.
is that with a 4" backspace?
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post #8 of 20 (permalink) Old 12-18-2012, 10:28 AM
 
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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...
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post #9 of 20 (permalink) Old 12-19-2012, 06:38 AM
 
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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.
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post #10 of 20 (permalink) Old 12-20-2012, 05:15 PM
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Garage
Running 275x60x15 on vintage 15x7 rally's. No clearance issues at all...

Mitch
1967 GTO; Gulf Turquoise on Black, 4 speed, buckets SOLD
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