Fitment questions?
Call (855) 786-7101 or text (801) 304-3141.
Real people. Real answers.
Product details
The red left-hand GP310 supplies four-piston braking in the later front fork-mount configuration documented for 2000–2007 Harley-Davidson motorcycles. It has a billet aluminum housing and stainless pistons. A 0.25-inch nominal rotor width and M10 x 1.50 inlet identify the selected version’s rotor and line interfaces. 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: 120-7739-RD
- Caliper type: GP310 Motorcycle Front (2000-2007)
- 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: 11.00–11.50 inches
- Mounting style: Lug
- Mounting side: Left Hand
- Mounting centers: 2.72 inches
- Mount height: 2.18 inch
- Hydraulic inlet thread: M10 x 1.50
- 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
Confirm that the left fork uses the 2.72-inch mounting centers and correct stand-off. Springer and four-speed FL models are excluded by Wilwood. Measure the rotor, inspect pad overlap and leave adequate spoke clearance; motorcycles with replacement forks or brake conversions require the actual component specifications to be compared.
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.
