Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The polished billet GP310 is a right-hand rear caliper for a properly matched custom Harley-Davidson sprocket-brake assembly. Its four stainless pistons use 1.25-inch bores, and the caliper accepts the 6208 pad shape. Wilwood Engineering, founded by Bill Wood in 1977, is based in Camarillo, California. The company makes and designs disc brake components and systems for motorsport, street-performance and specialized applications, including calipers, brake rotors, master cylinders, valves, fittings and brake lines.
Technical Details
- Manufacturer part number: 120-10174-P. Component: GP310 Motorcycle Rear (Sprocket Brake) caliper.
- Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
- Hydraulic inlet thread: 3/8-24. Use a fitting with the correct thread and sealing seat.
- polished finish on a billet aluminum caliper body.
- 4 stainless steel pistons with 1.25-inch bore diameter. The specified effective area is 2.46 sq in.
- Caliper weight: approximately 2.3 lb.
- Brake pad profile 6208; select friction material for the actual operating conditions.
- 3.50-inch lug mounting pattern, right hand; hole size 0.39 inch.
- Piston dust boots: not fitted.
- The rotor channel is specified for 0.35-inch nominal width. Rotor outside diameter: 9.00 to 11.50 inches. Specified rotor-width limits: 0.29–0.35 inch.
Fitment & Compatibility
Select the matching sprocket brake mounting hardware and verify a 0.29–0.35-inch braking-surface thickness. Check wheel and chain-area clearance as part of the custom installation rather than relying on the motorcycle make alone.
Ask PMB Performance to check the complete brake arrangement before ordering. Our team brings over 20 years of experience; photographs and measured bracket and rotor dimensions make that check more useful.
