Fitment questions?
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Product details
A red finish distinguishes this right-rear GP310 four-piston caliper. It is a billet aluminum hydraulic component with 1.25-inch stainless pistons and a 3/8-24 inlet. It fits through a suitable 3.50-inch rear mounting bracket, which must be selected separately for the particular Harley-Davidson brake arrangement. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components, from calipers and brake rotors to master cylinders, valves, fittings and brake lines, for motorsport, street-performance and specialized applications; selection depends on the complete brake system.
Technical Details
- Manufacturer part number: 120-7740-RD
- Caliper type: GP310 Motorcycle Rear
- Construction: Billet Aluminium
- Finish: Red Powder Coat
- 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
Before ordering, identify the bracket fitted to the motorcycle and check its application and rotor offset. Confirm the published rotor-width envelope, pad sweep and space around the wheel and drive assembly. Do not use the GP310 front-year ranges to infer rear compatibility; the rear bracket and complete package control fitment.
With over 20 years of parts experience, PMB Performance can help compare this component with your existing brake assembly. Include its caliper reference and any conversion-kit information.
Brake-pad warning: Cancer and Reproductive Harm. www.P65Warnings.ca.gov. This warning applies to the brake pads.
