Vortex 151ZB-57 CAT5 420 Aluminum Rear Sprocket 57-Tooth Black

The Vortex 151ZB-57 is a 57-tooth, 420-pitch CAT5 aluminum rear sprocket finished in a black anodized coating. Engineered for performance-oriented mini bikes and small-displacement motorcycles that use a 420 chain, this sprocket delivers a meaningful upgrade over stock steel units in both weight and durability.

Key Features:

• 420 Chain Pitch — designed for use with 420-pitch drive chains
• 57 Teeth — high tooth count for increased acceleration and low-end pull
• Black Anodized Finish — corrosion-resistant finish for lasting appearance
• Lightweight Aluminum Construction — CNC machined from specially formulated alloy per Vortex specifications, reducing rotating mass
• Vortex Patented Unique Tooth Design — promotes smoother chain engagement and increases sprocket longevity
• 100% CNC Manufactured in the USA — precision machined for consistent concentricity and tight tolerances
• Lightening Holes — strategically placed to further reduce unsprung rotating weight

Vortex Racing rear aluminum sprockets are trusted by professional race teams worldwide and offer a direct performance upgrade for riders seeking improved throttle response. The 151ZB series is engineered to fit specific mini bike and small-displacement motorcycle applications using the 420 chain standard.