Enkei 4 Pk OD 73 ID 56.15 Hub Centric Rings BRZ/FRS
Enkei hub centric rings are manufactured so that when they are installed on a vehicle, the wheels are located directly off of the center flange of the brake rotor. This is done to ensure that the outer beads of the wheel are concentric with the wheel bearings. The result is a much truer, better balanced tire/wheel assembly. Hub centric rings are not required, but they do often make the mounting of wheels onto the hub easier.