At DMG Motorsports, we present the Vortex CAT5 Rear Sprocket 42T-520 in Black for Yamaha (Part #840AZK-42) — a race-inspired rear sprocket built for riders who demand lightweight strength and standout style. Vortex is a trusted name in the sprocket world, and this CAT5 series piece is engineered to deliver reliable performance whether you're carving up the track or logging miles on the street.

Features:

• Anodized FIRST then CNC machined from 7075 aluminum for a durable, race-ready sprocket
• Unique color-anodizing process reveals a trick black finish with striking silver highlights where the material is machined
• Unique tooth design engineered for smooth chain engagement and increased sprocket longevity
• 42-tooth configuration built for 520 chain pitch, designed to fit Yamaha applications
• Vortex's patented sprocket design and craftsmanship make it unlike any other sprocket on the market
• Trusted by champions — Vortex sprockets are proven in competitive racing environments
• Lightweight aluminum construction helps reduce unsprung weight for improved acceleration and handling