Vortex 151ZK-52 CAT5 420 Rear Sprocket 52-Tooth Black Aluminum

The Vortex 151ZK-52 is a CAT5 series 52-tooth aluminum rear sprocket designed for 420 pitch chains, finished in a black anodized coating. Built from 7075 T6 aluminum, this sprocket delivers a significant weight reduction over stock steel units, reducing rotating mass for improved throttle response and acceleration.

Key Features:

• 52-Tooth / 420 Chain Pitch — designed for small-displacement and mini-bike applications running 420 pitch chains
• 7075 T6 Aluminum Construction — premium aerospace-grade alloy offering maximum strength with minimal weight
• CAT5 Tooth Profile — Vortex's patented tooth geometry reduces friction, minimizes chain wear, and promotes smooth engagement and release
• Black Anodized Finish — corrosion-resistant hard anodize provides lasting protection and a clean, aggressive appearance
• CNC Machined in the USA — precision manufacturing ensures consistent concentricity and accurate tooth spacing for reduced drivetrain noise and vibration
• Lightening Holes — strategically placed cutouts reduce overall weight and rotational inertia without sacrificing structural integrity

The Vortex 151ZK-52 is a direct replacement rear sprocket for riders seeking a performance upgrade over heavy OEM steel components. The black anodized finish is both functional and visually distinctive, making it a popular choice for street, track, and pit bike builds.