Vortex 491AZK-43 Black 43-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 491AZK-43 is a 43-tooth, 520-pitch aluminum rear sprocket finished in a durable black hardcoat anodize. Engineered for performance street and track riders who demand a lightweight, long-lasting alternative to a heavy OEM steel sprocket, this sprocket delivers measurable gains in throttle response and acceleration by reducing rotating mass in the drivetrain.

Key Features:

• Lightweight aluminum construction — reduces rotating mass compared to stock steel sprockets for improved acceleration and throttle response
• 7075-T6 aluminum alloy — specially formulated per Vortex specifications for an optimal balance of strength and low weight
• 100% CNC machined in the USA — manufactured to tight tolerances for concentricity and precise chain engagement
• Black hardcoat anodized finish — hard anodized with a jet black dye for corrosion resistance and long-term durability
• Vortex patented tooth profile — unique tooth geometry engineered to extend sprocket longevity and promote smooth, quiet chain engagement
• 520 chain pitch — compatible with standard 520-pitch drive chains
• 43 teeth — provides a range of gearing options depending on front sprocket selection

The Vortex 491AZK-43 is a direct upgrade for riders looking to fine-tune their motorcycle's gearing ratio or replace a worn rear sprocket with a high-performance component. Pairs with any standard 520-pitch chain and is compatible with a wide range of motorcycle applications that use the 491-series bolt pattern.