At DMG Motorsports, we present the Vortex CAT5 Rear Sprocket 40T-520 in Black for Yamaha (840AZK-40) — a race-bred aluminum sprocket engineered to shed rotating weight while standing up to the abuse of hard acceleration, braking, and shifting. Vortex builds its CAT5 series with a distinctive manufacturing process: color anodizing happens before CNC machining, which is why each sprocket shows off a striking black finish with contrasting silver highlights along the machined edges. Backed by decades of racing pedigree, this sprocket is a favorite among riders who demand performance without added rotational mass.

Features:

• CNC machined from premium 7075 aluminum for a lightweight, race-ready build
• Anodized first, then CNC machined, resulting in a trick black finish with silver highlights
• Unique tooth design engineered to increase sprocket longevity and improve power transfer
• 100% CNC manufactured to Vortex's specially formulated alloy specifications
• 40-tooth configuration designed for 520 chain conversions on compatible Yamaha models
• Vortex's patented sprocket design, trusted and proven by champions on the track