Vortex 610-39 Silver 39-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 610-39 is a 39-tooth, 520-pitch aluminum rear sprocket finished in silver anodize. Engineered for motorcycle powersports applications, this sprocket is part of Vortex Racing's trusted 610 series — a go-to choice for street riders and track enthusiasts looking for a precision-crafted, lightweight alternative to heavy OEM steel sprockets.

Key Features:

• 39-Tooth / 520 Chain Pitch — direct replacement or gearing upgrade for compatible 520-chain motorcycles
• Lightweight aluminum construction — reduces unsprung and rotating mass compared to stock steel sprockets
• Precision CNC machined — manufactured to exact specifications for true concentricity and reliable chain engagement
• Vortex patented tooth design — unique profile engineered to increase sprocket longevity and reduce chain wear
• Hard anodized silver finish — corrosion-resistant coating protects the aluminum alloy for long service life
• Lightening holes — strategically placed cutouts reduce rotating mass without sacrificing structural integrity

The Vortex 610-39 rear sprocket is a direct bolt-on upgrade that delivers improved throttle response and drivetrain efficiency. Whether used as a stock replacement or as part of a gearing change, it provides the quality and consistency that Vortex Racing is known for.