Thanks! Looks you have about as much tire as possible!Oh and here is my wagon on 15x8.5 rear vectors with 275/50/15 drag radials on the back. These wheels had 3.375" backspace which is a little small and they stuck out more than ideal. They cleared no problem, but stuck out too much to really tuck the wheel under the tub.
The rear wheel tubs on the wagons aren't anything special or smaller than any other G body so a 15X8 with 4" BS fits well.
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