1. BRAKE CALIPER
The first critical measurement is the minimum diameter that the barrel of the wheel—the center—can be to fit around your brake package. Using a square, measure from the center line of the hub to the outside edge of the caliper. Tire Rack recommends approximately 1/8 inch between the caliper and hub to accommodate for flex between the wheel or spindle under heavy cornering and braking. With wider aftermarket calipers, measure the distance between the side of the caliper and the face of the rotor to check the clearance on the back side of the spokes. This is not a concern with most OEM brakes, but most aftermarket, multi-piston calipers will need to be measured.
[ We got a radius of approximately 7 inches, meaning the inner diameter of the wheel’s barrel cannot be less than 14 inches (which a 15-inch wheel diameter provides).