At DMG Motorsports, we present the Vortex CAT5 Rear Sprocket in 45-tooth, 520 pitch, black finish, built for Yamaha applications and part-numbered 840AZK-45. This sprocket swaps out heavy OEM steel for a purpose-built, race-bred aluminum component that sheds unsprung weight while looking as aggressive as it performs. Vortex sprockets are trusted at the highest levels of racing, and the CAT5 line brings that same championship-proven design straight to your bike.

Every CAT5 sprocket starts life as a raw billet that is anodized in color first, then precision CNC machined from 7075 aluminum, a process that reveals sharp silver highlights against the black anodized surface for a finish that is as distinctive as it is durable. The result is a lightweight, aerospace-grade sprocket that is 100% CNC manufactured in the USA to Vortex's own specially formulated alloy specifications, giving it the strength and consistency required for serious street and track use.

Features:

• Anodized in color FIRST, then CNC machined from 7075 aluminum for a trick two-tone finish with silver highlights
• 100% CNC manufactured in the USA from a specially formulated alloy per Vortex specifications
• Unique tooth design increases sprocket longevity over standard sprocket profiles
• Lightweight aluminum construction reduces unsprung and rotating mass versus heavier OEM steel sprockets
• Patented Vortex sprocket design unlike any other sprocket on the market
• 45-tooth, 520 pitch configuration in a black finish, engineered to fit specified Yamaha models
• Design proven by champions and trusted across professional racing paddocks