Wilwood Red Left XRS6R Six-Piston Caliper, 1.75/1.25/1.25-Inch Differential Bores

This red left-hand Wilwood XRS6R is selected by its 1.75/1.25/1.25-inch bores and nominal 1.10-inch rotor width. The six-piston design uses stainless pistons in a forged housing with internal passages, avoiding an external crossover tube. From its base in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and components. Bill Wood founded the company in 1977; its motorsport, street-performance and specialized range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-17218-RD. Type: Forged XRS6R Radial Mount caliper.
• Construction and surface: forged aluminum, finished in Red Powder Coat.
• Bore sequence 1.75/1.25/1.25 inches across 6 pistons. Piston construction: stainless steel; specified effective area 4.86 square inches.
• Attachment geometry: radial mount with 5.98-inch centers; left hand. 0.39-inch holes; 1.45-inch mounting height.
• Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
• Rotor dimensions: outside diameter 11.75–14.00 inches; nominal width 1.10 inch, with width limits of 1.00–1.10 inch.
• Pad fit uses shape 10416. Match the pad to the rotor and intended operating conditions.
• Caliper component weight: approximately 5.2 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Match the fitting thread and sealing arrangement to the brake hose.
• Piston dust boots: no.

Fitment & Compatibility

Compare the caliper's effective area with the brake system's original sizing. Then check the radial bracket, rotor midline and 10416 pad sweep together; the left-hand designation alone does not establish compatibility.

PMB Performance brings over 20 years of experience to brake-component selection. Share the installed caliper, rotor size and mounting arrangement so the relevant dimensions can be compared.