Vortex 523ZK-51 520-Pitch 51-Tooth Black Aluminum Rear Sprocket

The Vortex 523ZK-51 is a 51-tooth, 520-pitch aluminum rear sprocket finished in a durable black hard-coat anodize. Engineered for motorcycle road racing, motocross, supercross, and high-performance street riding, this sprocket delivers the precision and reliability that Vortex Racing is known for worldwide.

Key Features:

• 520 Chain Pitch — compatible with standard 520-pitch drive chains
• 51-Tooth Rear Sprocket — provides increased low-end torque and improved acceleration
• Black Hard-Coat Anodized Finish — PTFE-based hard coat bonds to the aluminum surface for superior corrosion resistance and reduced friction
• 100% CNC Machined — manufactured in the USA to tight tolerances for concentricity and smooth power transfer
• Aerospace-Grade Aluminum Construction — lightweight design reduces rotating mass for improved throttle response
• Lightening Holes — strategically placed cutouts further reduce weight without sacrificing strength
• Patented Tooth Design — Vortex's unique tooth profile extends sprocket longevity and reduces chain wear

Vortex Racing has been manufacturing top-quality motorcycle racing components in the USA for over 15 years, supplying professional race teams across motocross, supercross, road racing, and flat track disciplines. The 523ZK-51 rear sprocket is a direct performance upgrade over OEM gearing, offering a perfect balance of weight savings and durability for both track and street applications.