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Wilwood GT60 Spec-37 Drilled Slotted Rotor 16.00 x 1.50in Black
The Wilwood 160-13787-GTB is a GT60 series 2-piece front brake rotor engineered for extreme braking applications including road course and short track competition. Manufactured from Wilwood's proprietary Spec-37 iron alloy, the 16.00 x 1.50 in. ring features 60 curved vanes and an asymmetric GT face slot pattern with a right-hand orientation. The GTB designation indicates a black e-coat finish on the hat for applications where corrosion resistance is required. This rotor is individually dynamically balanced for vibration-free performance.
Key Features
- Wilwood Spec-37 iron alloy — proprietary military-derived formulation for extreme heat resistance and crack resistance
- 60 curved vanes (GT60) — maximum cooling capacity for road course and short track competition
- Asymmetric GT face slot pattern — proven slot geometry for consistent bite and pad wear
- Right-hand (RH) orientation — confirm correct side before ordering
- Black e-coat hat (GTB) — corrosion-resistant finish on the hat for wet and harsh environments
- Individual dynamic balancing — smooth vibration-free operation at any speed
- 2-piece construction — replaceable rotor rings; retain the hat when replacing rings
What's Included
- 1x Wilwood 160-13787-GTB GT60 2-piece rotor assembly
Specifications
| Specification | Detail |
|---|---|
| MPN | 160-13787-GTB |
| UPC | 889545072266 |
| Rotor Diameter | 16.00 in. |
| Rotor Thickness | 1.50 in. |
| Bolt Pattern | 12 on 9.75 in. BC |
| Vane Count | 60 curved vanes |
| Material | Spec-37 iron (ring), hat material varies |
| Finish | Black e-coat hat (GTB) |
| Orientation | Right-hand (RH) |
| Series | GT60 |
| Slot Pattern | Asymmetric GT face slot |
| Construction | 2-piece (replaceable ring) |
Frequently Asked Questions
-
Q: What is Spec-37 iron?
A: Wilwood's Spec-37 is a proprietary iron alloy developed from military-grade rotor technology. It provides the highest available resistance to heat distortion, warping, cracking, and wear for competition applications. -
Q: What is the difference between GTB and GT?
A: The GTB version includes a black e-coat finish on the hat for improved corrosion resistance. The GT uses a standard hat finish. Rotor ring performance is identical. -
Q: Is this a right-hand or left-hand rotor?
A: The 160-13787-GTB is a right-hand (RH) rotor. A separate left-hand part number is required for the other side. -
Q: Can the rotor rings be replaced separately?
A: Yes. The 2-piece design allows ring replacement while retaining the hat, reducing long-term ownership cost. -
Q: What is the bolt pattern?
A: 12 bolts on a 9.75 in. bolt circle. -
Q: Is this rotor street-legal?
A: The 160-13787-GTB is designed for competition use. Confirm your jurisdiction's street use requirements before installation on a street-driven vehicle. -
Q: What braking systems are compatible with this rotor?
A: This rotor is designed for use with Wilwood's GT series 6-piston calipers on custom and competition brake setups. Consult Wilwood or your brake system builder for caliper compatibility. -
Q: Is individual dynamic balancing included?
A: Yes. Every Wilwood 160-13787-GTB rotor is individually dynamically balanced for vibration-free performance at any speed.
Installation Instructions
This is a competition component. Installation should be performed by a qualified brake system technician. Confirm rotor orientation (RH) before installation. Mount to the hat flange using the specified fasteners and torque to Wilwood specifications. Bed the rotor per Wilwood's competition bedding procedure before racing use. Inspect all hardware after initial use.
WARNING: This product can expose you to chemicals including nickel compounds and other metals known to the State of California to cause cancer or reproductive harm. For more information go to www.P65Warnings.ca.gov.
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