Vortex 251AZUV4-42 Aluminum Rear Sprocket 42T 520 Pitch Blue Anodized

The Vortex 251AZUV4-42 is a 42-tooth, 520-pitch aluminum rear sprocket finished in a vibrant blue anodize. Engineered for performance street and track applications, this sprocket is manufactured in the USA using a specially formulated aluminum alloy per Vortex's own specifications, delivering an ideal balance of low weight and high durability.

Key Features:

• 42-tooth, 520 chain pitch rear sprocket
• Blue anodized finish — color anodizing applied to the body while teeth and highlights retain a bright silver appearance
• 100% CNC machined in the U.S.A. to tight tolerances
• Specially formulated aluminum alloy per Vortex specifications for optimal strength-to-weight ratio
• Patented tooth design engineered for increased sprocket longevity and smooth chain engagement
• Reduces rotating mass compared to OEM steel sprockets for improved acceleration and throttle response
• Anodized surface finish provides corrosion resistance and long-lasting color

Vortex Racing has been a trusted name in motorcycle performance components for over 15 years, with products proven at the highest levels of professional road racing, motocross, and supercross competition. The 251AZUV4-42 rear sprocket is an excellent upgrade for riders seeking to reduce unsprung weight and add a distinctive look to their drivetrain.