Motorcycle Caliper – Part No: 120-7737-P
Call (805) 388-1188
GP310 Motorcycle Front (1984-1999)
Prod #: 120-7737-P
Price: $481.17
GP310 Motorcycle Front (1984-1999) - Product Summary
Caliper No: 120-7737-P
GP310 Motorcycle Front (1984-1999)

Piston Count 4
Piston Area (in²) 2.46
Piston Type Stainless
Dust Boot No
Rotor Dimensions
Rotor Width (in) 0.25
Rotor Diameter(in) 11.50
Pad Dimensions
Pad Area (in²) 3.65
Pad Volume (in³) 0.63
Duty Rating & Material
Material Billet Aluminium
Weight(Lbs) 2.0
Colors & Finish
Color Polished
Finish Polish

Mount Center(in) 3.44
Mount Position
Mount Side Left Hand
Mount Type Lug
UPC Number
UPC 889545005585
Product Documents
Product Data Sheet

Click To Download
Installation Instructions

WARNING: Cancer and Reproductive Harm
Applicable to Brake Pads Only

120-7737-P - Product Description

GP310 Motorcycle Front (1984-1999)

Wilwood's GP310 motorcycle disc brake caliper has been designed and engineered for use on 1984 to 1999 Harley-Davidson® Motorcycles. Built around a 4-piston, high performance powerhouse, this billet aluminum caliper brings distinctive, bolt-on styling: Direct leg-mounted calipers are available for all single and dual disc models (except Springer and 4-speed FL models), as well as the 1983 XR 1000.

Rear calipers are available for all Softail®, Dyna, and touring models, utilizing unique bracket designs that combine the right elements of strength and style.

The GP310 caliper is available in polished, brilliant chrome or black finishes, with the added performance characteristics found in Wilwood's racing calipers: stainless steel pistons to reduce brake fade while resisting corrosion and high temperature piston seals for extended life, controlled retraction and drag free operation. Additional features include bright-finish bleed screws and hardware, exclusive pad anti-rattle clip, and brake pads designed to operate in the widest range of temperatures and environments, utilizing our industry leading stainless steel rotor compatible formulation.

Vehicle Applications
Driving Environment Motorcycles
Vehicle Sub-Types
Application Duty Heavy Duty
Driving Environment Power Sports
Vehicle Sub-Types ATV, Snowmobile
Application Duty Medium Duty

Product Specifications

Rotor Compatibility
Rotor Width (in) 0.25
Maximum Rotor Width (in) 0.25
Minimum Rotor Width (in) 0.18
Maximum Rotor Diameter(in) 11.50
Minimum Rotor Diameter(in) 11.00

Brake Pad Specifications
Brake Pad Type 1 6208
Brake Pad Type 2 N-A
Brake Pad Type 3 N-A
Total Pad Area (in²) 3.65
Total Pad Volume (in³) 0.63
Piston Specifications
Piston 1 Bore (in) 1.25
Piston 2 Bore (in) 1.25
Piston 3 Bore (in)
Total Piston Area (in²) 2.46

Mounting Specifications
Mount Type Lug
Mount Side Left Hand
Mount Center(in) 3.44
Mount Hole Size(in)
Mount Height(in) 2.33
Inlet Thread Size 3/8-24
Pad Dimensions & Part Numbers
Pad Dimensions for the GP310 Motorcycle Front (1984-1999) Pad Dimensions for the GP310 Motorcycle Front (1984-1999) Zoom Image
Axle Set P/N
Pad Type
Non-Bedded Pads - by Compounds
Mount Dimensions & Part Numbers

Dimensions for the GP310 Motorcycle Front (1984-1999) Dimensions for the GP310 Motorcycle Front (1984-1999) Zoom Image

Additional Notes

Parts & Accessories

O-Ring Kit 130-3602
Replacement Dust Boot N-A
Replacement Piston 1 200-3533
Replacement Piston 2 200-3533
Replacement Piston 3 N-A
Replacement Piston 4 N-A
Cross-Over O-Ring Kit 130-10540
Bridge Bolt Kit N-A
Wear Plate L/H N-A
Wear Plate R/H N-A
Pad Retainer 180-10341
Bleed Screw Kit 220-3537
Self Bleeder Tube N-A
Cross-Over Tube N-A
Products commonly used with this item:

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Wilwood makes every effort to maintain our web site to ensure the accuracy of prices and product information. However, product information and prices are subject to change without notice. Please call (805) 388-1188 before ordering to verify current prices and product information.
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Version: 3.05 June 23, 2023