Vortex 491AZK-45 Black 45-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 491AZK-45 is a 45-tooth, 520-pitch black anodized aluminum rear sprocket engineered for performance motorcycle applications. Manufactured by Vortex Racing, this sprocket features the brand's patented tooth profile design, which is purpose-built to reduce wear and extend service life compared to conventional sprocket designs.

Key Features:

• 45-Tooth Configuration – Provides tunable gearing for acceleration-focused performance setups
• 520 Chain Pitch – Compatible with standard 520-series drive chains
• Lightweight Aluminum Construction – High-grade aluminum alloy reduces unsprung and rotating weight for improved throttle response
• Black Anodized Finish (AZK Series) – Hard anodized coating on the sprocket body with contrasting silver machine cuts on the teeth and detail areas for a premium appearance
• Vortex Patented Tooth Design – Unique tooth geometry increases sprocket longevity and chain engagement efficiency
• CNC Machined Precision – Tight manufacturing tolerances ensure consistent fit and smooth chain tracking

The 491AZK-45 is a direct bolt-on rear sprocket replacement for compatible motorcycle models. The black anodized AZK finish uses color anodizing on the sprocket body while leaving the sweep areas, mud grooves, and teeth in natural silver aluminum — delivering a distinctive two-tone look that holds up under demanding riding conditions.