Wilwood rotor/hat register rings, 2.17-inch diameter, are offered in a two-pack to help center and seat rotors on hats or hubs with mismatched register sizes. These rings promote precise rotor alignment and smooth running by ensuring the rotor bore matches the hub register, a common requirement when installing aftermarket rotors or adapting different hardware during brake upgrades.

Wilwood Adapter Rotor/Hat Register Ring 2.17in Dia. - 2 Pack