Wilwood Left-Hand 12.72-Inch GT Slotted Rotor, 1.38 Thick, Spec-37 Iron

This left-hand GT ring retains a thick 1.38-inch Spec-37 section within its 12.72-inch outside diameter. The slotted faces and 48-vane core are supported by a twelve-hole flange that differs substantially from eight-bolt rings of similar size. 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: 160-3315
• Quantity: One rotor; not an axle pair
• Outside diameter: 12.72 inches
• Nominal thickness: 1.38 inches
• Rotor material: Spec-37 Iron
• Construction: 48 curved vanes
• Friction surface: GT Slotted
• Finish: Plain
• Approximate weight: 18.70 lb
• Factory burnished: No
• Dynamically balanced: Yes
• Installation orientation: Left-hand
• Rotor attachment pattern: 12 x 6.75 inches
• Rotor mounting hole / thread: 0.251 inches
• Registration / lug inside diameter: 6.25 inches
• Far-side inside diameter: 7.69 inches
• Opposite-hand companion rotor: 160-3314 (sold separately)
• Intended use and restrictions: 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

Confirm the 6.25-inch register and 7.69-inch far-side inside diameter. The twelve-on-6.75-inch rotor connection must match the carrier independently of any wheel bolt pattern.

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.