Quote:
Originally Posted by The Champ
225/50/17's are 25.9" tall so you should have no problems with those on all 4 corners if you want.
The 17x7 Cragar Eliminators have 4.25" BS - same as the factory 15x7's that I run on my '64 GTO. I have 235/60/15's that are 10 millimeters wider (about .4") than the 225's and are 26.1" tall. These fit fine inside the stock wheelwells with all stock components.
The 17x8 Eliminators have 4.5" BS - which is what you'll want if you are planning to go with a disc brake conversion. The conversion typically requires .25" more BS so that's why I'd suggest 8's. Because the 225/50's are narrower than my 235/60's you might be alright with 7's - but I'd go with 8's to be sure.
Personally I think a 26" tall tire is too short for the rear of our cars - I run 255/60's which are 27" tall. A 255/50/17 would be about that tall and would fit fine on the 17x8's.
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Actually, disc brakes push the rim out further (typically .25").
And when you go from a 7 with 4.25 inch to a 8 with 4.5", you've pushed it out again .25".
If it were a 8 with 4.75" backspacing it would recenter the tire the same. In other words, a one inch wider rim needs 0.5" more backspace just to keep it equivalent. If you're trying to compensate for the discs, you'd need 4.75" backspacing with the 8".
This calculator might help you visualize it. Use offset 6mm with the 7, and offset 0 for the 8.
http://www.rimsntires.com/specs.jsp