Wilwood Left Black XRS6R Caliper, 1.75/1.25/1.25-Inch Bores and 1.25-Inch Rotor Channel

This black left-hand Wilwood XRS6R uses the larger 1.75/1.25/1.25-inch differential-piston layout in a forged body. The nominal 1.25-inch rotor-width bridge requires more than matching mounting centers: the radial bracket must also locate the housing at the correct rotor offset. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems for motorsport, street-performance and specialized use, including calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-17220-BK. Type: Forged XRS6R Radial Mount caliper.
• 5.98-inch-center radial attachment, left hand orientation. 0.39-inch holes; 1.45-inch mounting height.
• Nominal rotor width 1.25 inch; compatible width range 1.19–1.25 inch. Rotor diameter specification: 11.75–14.00 inches.
• Compatible pad profile 10416; confirm thickness and compound for the installation.
• 6-piston hydraulic layout with 1.75/1.25/1.25-inch bores and 4.86 sq in of effective area; piston type: stainless steel.
• Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
• Black Powder Coat finish on a forged aluminum body.
• Caliper component weight: approximately 5.2 lb.
• Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
• Piston dust boots: no.

Fitment & Compatibility

Confirm the hydraulic area suits the master cylinder and intended front-to-rear balance. The left-hand caliper must face the correct direction of rotation, with accessible bleeders and adequate space around the wheel barrel.

For help matching this caliper, contact PMB Performance with the brake-package details and rotor measurements. Our team has more than 20 years of experience with brake parts and fitment.