Vortex 313ZK-36 420 Aluminum Rear Sprocket 36-Tooth Black Anodized

The Vortex 313ZK-36 is a 36-tooth, 420-pitch aluminum rear sprocket finished in a black anodized coating. Engineered as a high-performance, lightweight replacement for heavy OEM steel sprockets, it is designed for motocross, off-road, and mini-bike applications where reducing rotating mass translates directly into improved throttle response and acceleration.

Key Features:

• 7075 T6 Aluminum Construction: Aerospace-grade alloy delivers exceptional strength-to-weight ratio, significantly lighter than stock steel sprockets
• 420 Chain Pitch: Compatible with standard 420-pitch drive chains
• 36-Tooth Configuration: Optimized tooth count for balanced acceleration and top-end performance
• CNC-Machined Precision: Tight manufacturing tolerances ensure accurate concentricity, consistent chain alignment, and reduced drivetrain wear
• Black Anodized Finish: Hard-anodized coating provides corrosion resistance and a clean, aggressive appearance
• Vortex Patented Tooth Design: Unique tooth profile minimizes chain drag and friction for smoother gear transitions and extended chain and sprocket life
• Lightening Holes: Strategic cutouts further reduce rotational mass for improved handling and acceleration response

The Vortex 313ZK-36 is a direct bolt-on upgrade that delivers measurable performance gains. Vortex Racing is a U.S.-based manufacturer known for producing race-proven drivetrain components held to the tightest tolerances in the industry.