Looking at 15" rims to use with radials for everyday driving. My 67 GTO has factory disc brakes in front. What is the correct offset and bolt spacing needed for aftermarket wheels?

Looking at 15" rims to use with radials for everyday driving. My 67 GTO has factory disc brakes in front. What is the correct offset and bolt spacing needed for aftermarket wheels?

I think that the wheel shop should be able to look at your current 14" factory wheels and figure out from them what offset etc you're going to need for the new ones. I don't know if this will affect you or not but the optional Rally One wheels in '67 that the factory put on disc brake cars were different than the Rally Ones that they put on the all-drum vehicles...there was a clearance problem with the 4 piston disc calipers. However since you're moving on up to 15" rims anyway you will probably avoid any of the clearance issues that came up with the 14"s. ( It's probably not a big deal but putting 15" wheels on the back will throw your speedo off a little too.)
Jim.

Based on experience with my '67 GTO. You can run a 15x7 with 4 inch backspace and 235-60's all the way around, or a 15x8 with a 4.5 backspace with 235's in front/rear, or go up a step to 245's or 255's in the rear. (You may have to raise the rear an inch or so with the 255's,I did.) A 4.75"/5 " backspace will give you even more clearance in the rear, but I used Rally II's and 4 and 4.5 were the only choices available.