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Product details
The Pontiac GTO rear-package rotor uses a different parking-drum diameter from many other 12.19-inch Wilwood castings. This GT version combines a slotted 0.81-inch friction ring with the 7.48-inch drum and 2.310-inch integral-hat offset. System compatibility is central to choosing a replacement rotor, including its relationship to the caliper, pad and mounting hardware. Wilwood designs and manufactures disc brake systems in Camarillo, California, offering calipers, rotors, master cylinders, valves, fittings and lines across motorsport, street performance and specialized applications. The company was founded in 1977 by Bill Wood.
Technical Details
- Manufacturer part number: 160-8743-GTB
- 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: GT Slotted
- Finish: Black Electro Coat
- Approximate weight: 15.80 lb
- Factory burnished: No
- Dynamically balanced: No
- Installation orientation: Non-directional
- Registration / lug inside diameter: 2.76 inches
- Far-side inside diameter: 6.70 inches
- Rotor offset: 2.310 inches
- Internal parking-brake drum diameter: 7.48 inches
- Internal clearance diameter: 6.38 inches
- Mounting-face thickness: 0.21 inches
- Hat wheel-stud clearance pattern: 5 x 4.75 inches
- Wheel-stud clearance hole diameter: 0.52 inches
- Intended use and restrictions: Rear rotor for compatible Pontiac GTO kits with an internal parking drum.
The integral hat is part of the rotor; caliper, pads, parking-brake mechanism and installation hardware are separate.
Fitment & Compatibility
Match the exact Wilwood GTO rear disc/drum kit and its parking-brake mechanism. Confirm the 2.76-inch register and five-on-4.75-inch stud clearances; the model name alone is insufficient for fitment.
Wilwood product specifications · Rotor dimension diagram
For more than 20 years, PMB Performance has helped customers choose brake components. Share the details of your current setup for assistance with rotor selection.
