At DMG Motorsports, we present the Vortex Aluminum Rear Sprocket 40T-520 in Silver for Yamaha (Part# 654A-40) — the same CAT5-style sprocket trusted by racers and champions across the paddock. Vortex Racing has built its reputation on precision-engineered drivetrain components, and this rear sprocket is a shining example of why it has become the go-to upgrade for riders who demand lightweight strength without compromise. Swapping to a Vortex aluminum sprocket sheds unsprung rotating mass compared to a heavier stock steel unit, translating into quicker acceleration, sharper throttle response, and improved handling every time you roll on the gas.

Machined from premium 7075 aircraft-grade aluminum, this sprocket is built to the exacting tolerances that have made Vortex the industry standard for race-proven drivetrain parts. Its patented saber-tooth design isn't just for looks — the unique tooth profile is engineered to extend chain and sprocket life while maintaining smooth, consistent power transfer. Finished in a durable anodized silver coating, this 40-tooth, 520-pitch sprocket is ready to bolt on and deliver the confidence-inspiring performance that has helped Vortex-equipped riders stand on podiums for decades.

Features:

• CNC machined from high-strength 7075 aircraft-grade aluminum for maximum strength at minimum weight
• Patented CAT5-style saber tooth design increases sprocket and chain longevity
• Lightweight aluminum construction reduces rotating mass for quicker acceleration and improved handling versus heavier steel sprockets
• Anodized silver finish for a durable, race-ready appearance
• 40-tooth, 520-pitch configuration designed for Yamaha applications
• Race-proven design trusted by champions and used at the highest levels of motorcycle racing
• Part of Vortex's industry-standard sprocket lineup, manufactured to precise racing specifications