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Product details
A 3.12-inch center register is the identifying feature of this 12.19-inch HP rear rotor. The plain 0.81-inch friction ring is cast around a 1.910-inch-offset hat and 7.24-inch parking drum, so the larger register must match the axle flange. Camarillo, California is home to Wilwood, founded by Bill Wood in 1977. The company designs and manufactures disc brake systems for motorsport, street performance and specialized applications, supplying rotors, calipers, master cylinders, valves, fittings and lines. Matching the rotor to the complete assembly matters as much as selecting its diameter or surface treatment.
Technical Details
- Manufacturer part number: 160-9987
- Quantity: One rotor; not an axle pair
- Outside diameter: 12.19 inches
- Nominal thickness: 0.81 inches
- Rotor material: Iron
- Construction: 32 vanes
- Friction surface: Plain Face
- Finish: Plain
- Approximate weight: 14.40 lb
- Factory burnished: No
- Dynamically balanced: No
- Installation orientation: Non-directional
- Registration / lug inside diameter: 3.12 inches
- Far-side inside diameter: 8.38 inches
- Rotor offset: 1.910 inches
- Internal parking-brake drum diameter: 7.24 inches
- Internal clearance diameter: 7.16 inches
- Mounting-face thickness: 0.18 inches
- Hat wheel-stud clearance pattern: 5 x 4.50/4.75/5.00 inches
- Wheel-stud clearance hole diameter: 0.52 inches
- Intended use and restrictions: Rear rotor for compatible internal-drum parking-brake kits.
The integral hat is part of the rotor; caliper, pads, parking-brake mechanism and installation hardware are separate.
Fitment & Compatibility
Confirm the 3.12-inch bore rather than substituting the 3.06-inch-register version. Match the installed parking shoes, caliper position and wheel-stud clearance pattern together.
Wilwood product specifications · Rotor dimension diagram
PMB Performance has supported brake projects for more than 20 years. Our team can help identify the correct replacement when your caliper, hat or hub configuration needs a closer look.
