Wilwood GP320 Caliper

The Wilwood GP320 Caliper is a compact, high-efficiency four-piston brake caliper designed for lightweight open-wheel racecars, karts, motorcycles, mini-sprints, and formula sports racers. Machined from premium billet aluminum using CNC technology, this caliper is engineered for strength, rigidity, and minimal weight, tipping the scales at just 2.1 lbs.

Featuring a dual bleeder design, the GP320 can be installed in either left or right-hand orientations. Its full-width bridges are reinforced with four high-strength, corrosion-resistant steel cross bridge bolts, providing resistance to deflection and body separation under high loads.

Technical Specifications

• Piston Count: 4
• Piston Material: Stainless Steel
• Piston Bore: 1.25" (each)
• Total Piston Area: 2.46 in²
• Pad Area: 3.65 in²
• Pad Volume: 1.03 in³
• Brake Pad Type: 6211
• Rotor Compatibility: 0.75"–0.81" width, 9.00"–11.50" diameter
• Mount Type: Lug
• Mount Center: 3.50"
• Mount Hole Size: 0.39"
• Mount Height: 1.63"
• Mount Side: Universal
• Inlet Thread Size: 1/8-27 NPT
• Material: Billet Aluminium
• Finish: Type III Anodize
• Color: Anodize
• Weight: 2.1 lbs
• Dust Boot: No

Key Features

• Full CNC billet aluminum construction for maximum rigidity and minimal weight
• Dual bleeder design for flexible mounting
• Four stainless steel pistons for even clamping force and reduced heat transfer
• Internal fluid ports with a single outboard bleeder for efficient fluid evacuation
• Corrosion-resistant cross bridge bolts for structural integrity under racing loads

The Wilwood GP320 Caliper is built for racers who demand reliable, lightweight braking performance and precise pedal feel in demanding competition environments.