Vortex 840AZK-39 CAT5 Rear Sprocket 520 Chain 39T Black Aluminum

The Vortex 840AZK-39 CAT5 rear sprocket is a premium lightweight aluminum racing sprocket designed for aftermarket wheels including BST, Marchesini, and Marvic applications. Engineered for 520 chain pitch with 39 teeth, this black anodized sprocket delivers exceptional performance and durability for high-performance motorcycles.

Key Features:

• 100% CNC manufactured in the USA from specially formulated 7075-T6 aluminum alloy
• Lightweight CAT5 design reduces unsprung weight for improved handling and acceleration
• Black anodized finish with contrasting silver machined highlights for a distinctive appearance
• Saber tooth grooves and unique tooth design increases sprocket longevity and power transfer efficiency
• Vortex patented sprocket design machined to the tightest tolerances
• Designed specifically for aftermarket wheel applications

Vortex Racing has been manufacturing top-quality racing components since 1995, with products tested by professional race teams worldwide. Each CAT5 sprocket is anodized first, then precision CNC machined to create the signature colored finish with bright silver highlights. The advanced tooth profile and precision manufacturing ensure optimal chain engagement, reduced wear, and maximum power transfer to the rear wheel.