MCAK1 Motor Cycle Adapter Kit for the Rhino CB155, CB250, CB255 and CB300 Wheel Balancer. also fits "The Max" CB150 and CB155 wheel balancer. The MCAK1 will allow you to balance Motorcyle wheels with center hole .555 inch up to 1.25 inch. Keep in mind for larger center holes or heavier bikes you might need the MCAK2.