Vortex pulley brakes are for custom Harley Davidson motorcycles (HD), custom choppers, bobbers and most custom motorcycles with Harley type Softail or rigid frames. These pulley rotors are precision machined from billet aluminum for strength and durability. Pulley rotor combo kit includes: custom four piston rear caliper, caliper bracket, 65 tooth pulley-rotor, anchor rod, weld-on tab and necessary hardware. Pulley rotors are available only for 1-1/2” belts. These custom motorcycle brakes perfectly match our 3D Vortex Wheels, Vortex Floating Rotors, Five Spoke Wheels and Five Spoke Rotors.