'67 GTO rear tire size - Page 2

fiesta62 · 12-20-2012, 11:05 PM

i have 15 x 8 with 5 inch backspace running 275/60 on rear.....15 x 7 with 4.5 inch back space runs 235/60 on front no issues, tried 245 on front it rubbed

novafreak69 · 12-27-2012, 08:50 AM

Quote:

Originally Posted by Too Many Projects

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

THANK YOU!!!!

This one correct???

Wheel Vintiques 60-573404 Wheel Vintiques 60 Series Pontiac Rallye II Wheels

Too Many Projects · 12-27-2012, 08:59 AM

Quote:

Originally Posted by novafreak69

THANK YOU!!!!

This one correct???

Wheel Vintiques 60-573404 Wheel Vintiques 60 Series Pontiac Rallye II Wheels

If you are going new aftermarket, I would suggest an 8" wheel as the sidewall bulges more than I like on the 7". Here is a link to the 8" but let me measure my backspace and get back with you today. I think the original 7" has a 4.5 backspace anyway.
Wheel Vintiques 60-5834042 Wheel Vintiques 60 Series Pontiac Rallye II Wheels

Too Many Projects · 12-27-2012, 03:05 PM

Well, I was wrong, the factory 7" wheel has 4" backspace at the bead and 4 1/2" at the lip. I took a few pics to show where I measured from.
First is at the bead...4"

Second is the overall setback of the tire... almost 5 3/4" This is the distance you need to know for clearance anyway. Having a narrower tire will provide more backspace. I couldn't get the camara down level on these pics to accurately show the measurement.

Third, you can see how much sidewall bulge is present with the 7" wheel. This will straighten up quite a bit with an 8" wheel.

I put this on the car to check for fender and frame clearance. Tire to frame is 1 1/2"

Tire to inner wheel well is close...1/2"
The 275x60x15's I have are on another car, a 1966 Chevelle and they are close but don't rub. It is 30 miles away in storage for the winter. Adding another inch to the wheel width and going with the 5" backspace that fiesta62 has should be good. If in doubt, consider a 255x60 tire but be aware that it is almost 2" shorter than a 275x60

novafreak69 · 01-03-2013, 03:43 PM

I test fitted a 15X8 Corvette rally on the car with a MT 275/60 Drag Radial... and there is no way the outside lip would not rub... I had about 2.5 inches to the inside frame rail. The guy wants to be able to rotate the tires..so different offsets on front and back wheels is a No Go. I think the 15X7 wheels with 245/60's will work on the front and rear... and still be stock appearing and not rub in the front or back....and not rub the aftermarket disc brakes in the rear......

Too Many Projects · 01-03-2013, 09:19 PM

A corvette wheel has a shallow offset....more wheel to the outside. Either way, if he wants to rotate tires, he needs to stay with a 235x60. They will rub slightly on the frame at full turn in front and a 245 will rub big time.

novafreak69 · 01-04-2013, 08:52 AM

Quote:

Originally Posted by Too Many Projects

A corvette wheel has a shallow offset....more wheel to the outside. Either way, if he wants to rotate tires, he needs to stay with a 235x60. They will rub slightly on the frame at full turn in front and a 245 will rub big time.

THANK YOU... That is what I was wondering...

Wheels and tires being orderd today! Thank You EVERYONE for your input on this project... I will post some pics on the forum when I finish this project. Car is pretty good shape.... Original Texas car from what I understand...

67 GTO post car. 400 w/automatic and Air.

Someone put the tri power intake and carbs off a 66 on this engine.... I am doing the disc brake upgrade, fixing some leaks.... and doing a Stage 2 Hotchkis suspension under it... and wheels and tires...