wheels
 

I HAVE A 67 GTO AND WANT TO KNOW IF I CAN PUT 15 INCH WHEELS IN THE REAR. IM THINKING OF DOING 15-7 FRONT REAR 15-8. IF SO WILL THE 15-8 FIT AND WHAT TIRE SIZE CAN I USE SO IT DONT RUB. ANYONE CAN HELP WITH THIS ID BE HAPPY. CARS BEEN CONVERTED TO DISC IN FRONT. SO A 15 INCH WHEEL WILL HAVE TO BE USED. ANY SUGGESTIONS WOULD BE GREAT

First.....

Welcome to the forum..... Tons of great knowledge here.....

Yes.... there are guys running 18" rims and larger even..... it will come down to tire size and wheel offset....

15x7 in front will like at least 4" backspacing and shoot for 4.5" backspacing on the 15x8's in the rear....

I am running 235/60r15's in front and 245/60r15's in rear....



One last thing..... undo the CAPS LOCK button.....

The factory 15x7" rims have 4.25" BS - and work fine with many tire sizes.

A 15x8" rim would need 4.75"BS to put the wheel and tire in the same space.

Bottom line, it's a combination of wheel diameter and width combined with the tire diameter and width that will determine if the combo will work.

I run 235/60/15's front and 255/60/15's rear on 15x7's with 4.25"BS on my '64.

Your results may vary...;)

wheels
 

thanks for the imfo. just wanted to know so i dont have to keep ordering stuff. so you can use 4.50 back space on rear. one guy says he uses 4.25. just dont want it to rub. use to have a 64 gto. bought it from a friend that had it 33 years. we had it 6.5 years. pro street car with 455-400 turbo- dana 60 rearend. we had a blast. its now in minnesota. miss it. we have a 67 gto now and cant wait to start. keep pontiac alive. thanks so much. tom

Listen to Champ. 7" wide factory rims had 4.25" BS. In order to have wheel centered up in same location with 8" rim (1" wider) add 1/2" to the 4.25 BS number. This way, the wheel is still equally centered, just 1/2" wider on each side of centerline of mounting surface. So, like Champ said, 8" rims with 4.75 backspacing will center the wheel up exactly like the factory wheels were centered up.
Good Luck,
Tony

I'd be looking to use 5" of backspacing for the 8" wide wheel in the rear, 4.75" at the very minimum.

A wheel with only 4.5" of backspacing is cutting it way too close, personally I think it would surely cause the tires to rub.