Wilwood Brake Kit GP310 R/H Sprocket Rear Chrome 51 ToothWilwoods Sprocket Brake kits 140 10181 140 10181 P are for a 51 tooth sprocket and R H 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