Vortex 438-66 Silver 66-Tooth 530-Pitch Aluminum Rear Sprocket

The Vortex 438-66 is a 66-tooth, 530-pitch aluminum rear sprocket finished in silver anodize. Designed for the 438 bolt pattern — compatible with select Yamaha and Suzuki sportbike platforms — this large-tooth stunt sprocket delivers the low-end torque and acceleration response demanded by performance and stunt riders alike.

Key Features:

• 66-tooth, 530-pitch rear sprocket for maximum low-end acceleration and stunt riding performance
• CNC machined from 7075 T6 billet aluminum — aircraft-grade alloy chosen for its exceptional strength-to-weight ratio
• Patented saber tooth groove design increases sprocket longevity and is unlike any other sprocket on the market
• 100% CNC machined to tight tolerances for precise fitment and reliable chain engagement
• Silver anodized finish — note: Vortex Racing sprockets in sizes 55 teeth and above are available in silver only
• 438 bolt pattern fits select Yamaha (R1, FZ6, FZ6S) and Suzuki (GSXR1000 2009–2018) applications
• Manufactured in the USA by Vortex Racing, trusted by professional race teams worldwide

Vortex Racing has been producing top-quality motorcycle racing components since 1995. Each part is engineered and tested on the track with direct input from top professional race teams. The 438-66 is the go-to choice for stunt riders who need maximum pulling power at any RPM, and for road riders seeking a significant gearing-down for more aggressive acceleration.