Levenhagen also told us we’d only be able to use a 17-inch wheel. The backspacing of our 17-inch TrailReady wheels is 4.5 inches, which puts the 8.5-inch wheel right next to the caliper retaining bolt. There isn’t quite 1/2-inch of clearance between the head of the bolt and the wheel. We didn’t try it, since we don’t have a 16-inch wheel lying around, but we think with less backspacing a 16-inch wheel might work with this brake combination. We did try it with a 15-inch wheel with 3.5 inches of backspacing and the wheel hits the caliper.