Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
This Forged XRD caliper is the thin-rotor, 1.75-inch-bore version of Wilwood’s four-piston lug-mount racing component. Top-supported pads and Quick-E-Clip retention leave the lower body profile open for installations where hub-side space is limited. A Type III anodized finish covers the forged aluminum housing. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. The manufacturer produces disc brake systems and components for motorsport, street-performance and specialized applications, with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Individual components are chosen to suit the complete brake system.
Technical Details
- Manufacturer part number: 120-17866
- Caliper type: Forged XRD Lug Mount
- Construction: Forged Aluminium
- Finish: Type III Anodize
- Piston bores: 1.75 / 1.75 inches
- Piston type: Stainless
- Piston count: 4
- Published piston area: 4.80 square inches
- Dust boots: No
- Nominal rotor width: 0.38 inch
- Rotor thickness limits: 0.25–0.38 inches
- Rotor diameter limits: 10.00–13.06 inches
- Mounting style: Lug
- Handedness: Not restricted to one side; correct mounting and bleed orientation required
- Mounting centers: 5.25 inches
- Mounting-hole size: 0.39 inch
- Mount height: 2.10 inch
- Hydraulic inlet thread: 1/8-27 NPT
- Required pad shape: 7812
- Published pad area: 6.36 square inches
- Published pad volume: 2.1 cubic inches
- Manufacturer-listed component weight: 3.8 lb
Fitment & Compatibility
Treat the XRD as a dimensional replacement or conversion component, not a universal bolt-on vehicle part. Confirm its 2.10-inch mounting height, rotor centerline and 5.25-inch bolt spacing together. The published rotor width is 0.38 inch, with a 0.25–0.38-inch thickness envelope; use a rotor diameter and pad sweep compatible with the complete mounting drawing.
PMB Performance has over 20 years of experience helping customers with brake and parts fitment. Share the installed component identification and relevant measurements when requesting assistance.
