Vortex 313ZR-37 420-Pitch Aluminum Rear Sprocket 37 Tooth

The Vortex 313ZR-37 is a lightweight 420-pitch aluminum rear sprocket with 37 teeth, engineered for performance-oriented riders seeking reduced rotational mass and precise power transfer. Part of Vortex's ZR aluminum sprocket series, this rear sprocket is 100% CNC machined from a specially formulated aluminum alloy to exact tolerances.

Key Features:

• 420 Chain Pitch — designed for 420-pitch chain applications common on mini bikes, small-displacement motorcycles, and youth motocross bikes
• 37 Teeth — allows riders to fine-tune final drive gearing for improved acceleration or top-end performance
• Lightweight aluminum construction — specially formulated alloy per Vortex specifications reduces unsprung and rotating mass
• Silver anodized finish — corrosion-resistant anodizing helps protect the sprocket surface from wear and the elements
• Vortex patented unique tooth design — engineered to extend sprocket longevity and improve chain engagement
• Lightening holes — strategically placed to further reduce rotating mass without sacrificing strength
• Precision CNC machined — manufactured to tight tolerances for concentricity and smooth, quiet operation

Vortex Racing is a U.S.-based manufacturer with a proven track record in Motocross, Supercross, Road Racing, and Flat Track Racing. Each sprocket is tested with direct feedback from professional race teams, making the 313ZR-37 a trusted upgrade over stock gearing for both competitive and recreational riders.