At DMG Motorsports, we present the Vortex Aluminum Rear Sprocket 42T-520 (Silver) for Yamaha, part number 654A-42 — a race-bred drivetrain upgrade built by a brand that has been putting championship-winning sprockets on podiums since the mid-1990s. This standard-series Vortex sprocket is CNC machined from high-strength 7075 aircraft-grade aluminum, shedding rotating mass compared to a heavy OEM steel sprocket so your Yamaha accelerates quicker and handles with less gyroscopic resistance. Vortex's proprietary tooth profile is engineered to reduce friction and wear on your chain and sprockets, extending drivetrain life while keeping power transfer smooth and consistent lap after lap. Finished in silver for a clean, factory-plus look, this 42-tooth, 520-pitch sprocket is trusted by racers and everyday riders alike who want proven strength without the extra weight.

Features:

• CNC machined from 7075 aircraft-grade aluminum for an excellent strength-to-weight ratio
• 42-tooth, 520-pitch design for precise gearing and chain compatibility
• Lightweight aluminum construction reduces rotating mass versus OEM steel for quicker acceleration and improved handling
• Unique, race-proven tooth design that minimizes friction and extends chain and sprocket life
• Silver anodized finish for a clean, performance-ready appearance
• Manufactured by Vortex, an industry-standard brand trusted by champions since 1995
• Designed as a direct-fit application for Yamaha models using 520-pitch chains