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See the Shelby Clone up in the page header?? That's me, running 16x8 all around!!!

You can run a 16x8 4.5" backspace with a 225/50-16 with some mods......

1) With Global West or TCP controls arms, you will be fine
OR
2) With the Pro-Motorsports negative wedge kit, you will PROBABLY be OK
OR
3) SOME 65-66 cars are getting by with just the Shelby drop, but "the moons must align" just right for this to work with no rubbing!!!

17" are actually an EASIER fit, because the wheel rim is above the ball joint, meaning you can run 4.75" backspace, which gives you a little more clearance.

If you have non-stock brakes, be aware that some aftermarket kits push the wheel further out in the wheelwell by 1/4"-3/8", like my Wilwoods did!!!
I'm still running 16x8 (4.5" BS), but I had to step down 1 tiresize to get 100% "no-rub". Be sure to compensate for your brakes BEFORE ordering wheels!!!
 
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