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Product details
This chrome right-rear GP310 is a bracket-mounted motorcycle caliper for the appropriate Harley-Davidson rear brake arrangement. Four 1.25-inch stainless pistons are housed in a billet aluminum body with 3.50-inch mounting centers. The caliper is supplied separately from the model-specific rear mounting bracket. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. The manufacturer produces disc brake systems and components for motorsport, street-performance and specialized applications, with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Individual components are chosen to suit the complete brake system.
Technical Details
- Manufacturer part number: 120-7740
- Caliper type: GP310 Motorcycle Rear
- Construction: Billet Aluminium
- Finish: Chrome
- 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: 9.00–11.50 inches
- Mounting style: Lug
- Mounting side: Right Hand
- Mounting centers: 3.50 inches
- Mounting-hole size: 0.39 inch
- Mount height: 1.55 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: 2.1 lb
- Supplied brake components: Individual GP310 caliper with brake pads
Fitment & Compatibility
Identify the exact rear bracket and motorcycle application before choosing this component. Wilwood offers different brackets for the supported rear layouts; a general GP310 rear description does not establish every model-year combination. Verify the rotor, 3/8-24 hydraulic inlet, pad position and clearance around the wheel and final drive.
For help identifying the correct brake component, provide the caliper markings and installation dimensions. PMB Performance has over 20 years of experience with parts and brake-system details.
Brake-pad warning: Cancer and Reproductive Harm. www.P65Warnings.ca.gov. This warning applies to the brake pads.
