Wilwood's Sprocket Brake kits 140 - 10722 140 - 10722 - P are for a 48 tooth sprocket and LH caliper application. The sprocket - rotor bolt circle is consistent on all Harley Davidson models with a 5 x 3.25 bolt circle. The accompanying billet aluminum GP310 caliper is a 4 piston powerhouse, available in either chrome or a bright polished finish. Sprocket brake kits utilize a unique bracket design that combines the right elements of strength and style for your custom application.