Our options for making the reducing rings work included machining them to a shorter length or reaming them to a larger inside diameter--neither of which seemed to be an optimum solution to us. We also thought if we ever needed to change a tire in sand or mud, we wouldn't want five tiny rings to worry about dropping once the wheel was off. (Lug nuts alone are hard enough to keep track of!) We decided a quick trip to the machine shop to get the rotor redrilled seemed a better solution. The new holes were laid out and drilled for a snug fit on the studs and were also slightly chamfered on the backside to clear the stud shoulders.