Wilwood 120-10174 GP310 4-Piston Rear Sprocket Brake Caliper Chrome

The Wilwood GP310 is a high-performance, 4-piston billet aluminum disc brake caliper engineered specifically for custom rear sprocket brake applications on Harley-Davidson motorcycles. Precision CNC-machined from aircraft-grade billet aluminum, this caliper delivers race-proven stopping power wrapped in a bold, distinctive aesthetic that complements any custom build.

The GP310 sprocket brake configuration mounts to a dedicated bracket system designed to work with 5 x 3.25 sprockets in 48-tooth or 51-tooth designs, combining structural rigidity with clean, purposeful styling. Available in both brilliant chrome and matte black finishes, this right-hand rear mount caliper is sold individually.

Key Features:

• 4-piston billet aluminum construction — precision CNC-machined for strength and lightweight performance
• Stainless steel pistons — reduce brake fade and resist corrosion under high heat and moisture
• High-temperature piston seals — extend service life, control retraction, and ensure drag-free operation
• 1.25" piston bore diameter — compatible with 0.35" disc thickness
• Bracket-mounted design — available for 48-tooth and 51-tooth sprocket applications
• Bright-finish bleed screws and hardware — polished presentation with easy maintenance access
• Exclusive anti-rattle pad clip — eliminates brake noise and pad movement
• Included brake pads — low-dust, low-noise formulation rated for a wide temperature range using Wilwood's stainless steel rotor-compatible compound
• Available in chrome or black finish

The GP310 sprocket brake caliper brings Wilwood's motorsport-derived engineering to the custom motorcycle segment, delivering the performance characteristics of a racing caliper in a bolt-on package purpose-built for style and function.