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Product details
This right-hand SRP rear rotor uses the larger 3.12-inch registration bore with a 1.910-inch hat offset. The 12.19-inch drilled-and-slotted ring and cast-in parking drum form one iron component, finished in black electro-coat. Founded by Bill Wood in 1977, Wilwood designs and manufactures disc brake systems in Camarillo, California. Its range includes calipers, rotors, master cylinders, valves, fittings and lines for motorsport, street performance and specialized applications. Rotor choice belongs within that complete system: the caliper, pad, mounting hardware and intended duty must work together.
Technical Details
- Manufacturer part number: 160-9989-BK
- 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: SRP Drilled & Slotted
- Finish: Black Electro Coat
- Approximate weight: 14.40 lb
- Factory burnished: No
- Dynamically balanced: No
- Installation orientation: Right-hand
- 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
- Opposite-hand companion rotor: 160-9990-BK (sold separately)
- 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
Check the axle register and complete rear-kit geometry before ordering. The multi-pattern clearance holes do not compensate for an incorrect center bore or hat offset.
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.
