Tire Sizing Help for a '67 Formula S Barracuda

You need more backspace on the 17" or any wheel for that matter. Having the RMS K/wilwood brake system myself I learned the hard way. The track width has increased about 1/2 to 5/8" on each side and you will have issues with rubbing the fender especially the front edge if you don't compensate for that. 17" x 7 wheel should have at least 5" of BS to clear that properly. 5" would be better....problem is finding them in styles you like. Most of the hard offsets come on fwd wheels and thus most look like tuner wheels. Front tires are 225 x 45 x 17 on hers and 225 x 45 x 18 on mine.

I had to make custom hubs for my wifes cuda when I went with the 73 up a arms/wilwoods and had to cut the front edge of the wheel opening 1" on my fat blu fish which has the RMS k on it. I am running 17 x 7 with 4.5" bs on wifes (with custom hubs that are 3/4" shorter than stock wilwood hubs) and 18x8 with 5.25 bs on my fbf with stock wilwood hubs....they still stick out to far by 1/2" to 5/8" on my car btw but they don't rub the front edge of the fender.

Good luck with the wheels....it can be a bit frustrating.

The hub on the left is the custom hub btw.