Moto-Master 4-Piston Supermoto Racing Caliper This caliper is developed specifically for supermoto racing, but also works great for aggressive stunt riding. Moto-Master components are manufactured to the tightest tolerances. The 4-Piston SM Racing Caliper is CNC-machined and anodized black. It can be used with your stock master cylinder, though a soft lever feel is typical. For the best performance and lever feel, match this caliper with a Moto-Master 12mm Radial Master Cylinder. Each caliper includes a set of SinterPro RacingGP brake pads. This is a "Universal" axial caliper, and requires a Moto-Master Racing Adapter Bracket, in order to mount it on a converted supermoto bike like a Honda CRF 450R or KTM 450 SX-F.(Will not work on radial fork bottoms like current Husqvarna FS 450 or KTM 450 SMR) This caliper is also available in these kits: Caliper Kit - Includes this caliper, brake pads, and adapter bracket. Full SM Racing Kit - Includes the above caliper kit, along with a master cylinder, brake line, and racing rotor. To find these kits for your bike, use the Bike Search at the top of the web page.