Wilwood 160-4565-B GT48 Curved Vane Spec-37 Left-Hand Disc Brake Rotor - Bedded

The Wilwood 160-4565-B GT48 Curved Vane Spec-37 is a competition-grade left-hand disc brake rotor pre-treated with a bedding process for immediate race-ready performance. Built from a proprietary iron alloy engineered to endure extreme braking temperatures, this rotor delivers exceptional resistance against distortion, warping, cracking, and premature wear — making it an ideal choice for short track and road course competition.

The iron alloy formulation draws from technology developed during Wilwood's manufacturing of extreme-duty military-spec rotors, providing a level of material integrity that goes far beyond conventional brake rotor construction. Every Spec-37 rotor is precision machined to less than .001" run-out, flatness, and parallelism, ensuring consistent, fade-free braking at any speed.

Key Features:

• GT48 Curved Vane Design — 48 curved internal vanes maximize airflow and heat dissipation for sustained braking performance under extreme conditions
• Proprietary Spec-37 Iron Alloy — Military-derived alloy formulation resists distortion, warping, cracking, and wear at extreme temperatures
• Asymmetrical GT Series Face Slot Pattern — Reduces harmonics and improves thermal balance across the rotor face for smooth, vibration-free engagement
• Individual Dynamic Balancing — Each rotor is balanced individually for smooth, vibration-free performance at all speeds
• Precision Machined — Less than .001" tolerance for run-out, flatness, and parallelism
• Pre-Bedded Finish — Factory bedding treatment prepares the rotor surface for optimal brake pad transfer from first use
• Left-Hand (LH) Directional — Curved vane geometry is directional; verify correct side before installation
• 12 x 8.75" Bolt Circle (Thru Bolt) — 12-bolt mounting pattern on an 8.75" bolt circle
• 12.90" Diameter / 1.25" Thickness — Full-size competition rotor dimensions

Designed for the highest cooling capacity and longest service life in demanding motorsports environments, the Wilwood GT48 Spec-37 rotor is the benchmark for short track and road course braking systems.