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Product details
A polished billet body identifies this right-front GP310 for Wilwood’s documented 1984–1999 Harley-Davidson fitment. Four stainless pistons apply the pads in the direct leg-mount arrangement. The caliper has a 3/8-24 inlet and the 3.44-inch mounting centers used by this earlier front version. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components for motorsport, street-performance and specialized uses, including calipers, brake rotors, master cylinders, valves, fittings and brake lines; each component must match the requirements of the complete brake system.
Technical Details
- Manufacturer part number: 120-7736-P
- Caliper type: GP310 Motorcycle Front (1984-1999)
- Construction: Billet Aluminium
- Finish: Polish
- Piston bores: 1.25 / 1.25 inches
- Piston type: Stainless
- Piston count: 4
- Published piston area: 2.46 square inches
- Dust boots: No
- Nominal rotor width: 0.25 inch
- Rotor thickness limits: 0.18–0.25 inches
- Rotor diameter limits: 11.00–11.50 inches
- Mounting style: Lug
- Mounting side: Right Hand
- Mounting centers: 3.44 inches
- Mount height: 2.33 inch
- Hydraulic inlet thread: 3/8-24
- Required pad shape: 6208
- Published pad area: 3.65 square inches
- Published pad volume: 0.63 cubic inches
- Manufacturer-listed component weight: 2.0 lb
- Supplied brake components: Individual GP310 caliper with brake pads
Fitment & Compatibility
Confirm the original fork and brake layout, excluding Springer and four-speed FL models. A rotor must match the caliper’s width and diameter limits, with correct pad contact and room inside the wheel. Follow the motorcycle’s fluid requirements, and confirm the right side rather than substituting a later or rear GP310. Wilwood also specifically includes the 1983 Harley-Davidson XR1000 front application; verify the same fork, rotor and mounting requirements.
PMB Performance has over 20 years of experience helping customers with brake and parts fitment. Share the installed component identification and relevant measurements when requesting assistance.
Brake-pad warning: Cancer and Reproductive Harm. www.P65Warnings.ca.gov. This warning applies to the brake pads.
