Wilwood Right-Hand SRP Replacement Ring, 13.06-Inch Drilled Spec-37 Rotor

This right-hand SRP ring supplies the 13.06-inch diameter in a twelve-bolt Spec-37 configuration. The 48-vane casting carries drilled-and-slotted faces and a black electro-coat finish, while retaining a 1.25-inch nominal section. 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: 160-7798-BK
• Quantity: One rotor; not an axle pair
• Outside diameter: 13.06 inches
• Nominal thickness: 1.25 inches
• Rotor material: Spec-37 Iron
• Construction: 48 curved vanes
• Friction surface: SRP Drilled & Slotted
• Finish: Black Electro Coat
• Approximate weight: 12.30 lb
• Factory burnished: No
• Dynamically balanced: No
• Installation orientation: Right-hand
• Rotor attachment pattern: 12 x 8.75 inches
• Rotor mounting hole / thread: 0.251 inches
• Registration / lug inside diameter: 8.25 inches
• Far-side inside diameter: 9.46 inches
• Opposite-hand companion rotor: 160-7799-BK (sold separately)
• Intended use and restrictions: For racing durability, Wilwood recommends comparable HD or GT rotors. Suitable for moderate-temperature racing and street use. Spec-37 heavy-wall castings.

The hat or hub, fasteners, caliper and pads are not included.

Fitment & Compatibility

Check the 0.251-inch attachment holes and 9.46-inch far-side inside diameter. For maximum racing durability, Wilwood directs comparison with corresponding HD or GT rotors.

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.