SHIBATA Alum. GRK Multi-use Rear Knuckle - BlackSHIBATA (#R31S334BK) Alum. GRK Multi use Rear Knuckle Black Feature: For: SHIBATA GRK This innovative aluminum rear knuckle is designed with a new concept, offering compatibility with both A arm and H arm setups depending on the chosen configuration. By separating the axle hub unit from the knuckle base body, it allows for flexible adjustments such as tread width and axle shaft position, simply by changing spacer thickness. For A arm setups, the