Renthal 490U-520-45P-HA Ultralight Rear Sprocket 520 Pitch 45 Tooth Hard Anodized Aluminum

The Renthal 490U-520-45P-HA Ultralight rear sprocket is a precision-engineered aluminum chainwheel built to the exacting standards demanded by professional motorcycle racing. CNC-machined from specially enhanced 7075-T6 aluminum alloy, this 520-pitch, 45-tooth sprocket delivers the performance and durability trusted by factory race teams across supercross, motocross, enduro, and road racing.

Key Features:

• 520 pitch, 45-tooth configuration for optimized power delivery and gearing
• 66% lighter than comparable steel sprockets while maintaining exceptional strength and durability
• CNC-machined from high-strength 7075-T6 aluminum alloy to extremely tight tolerances
• Hard anodized surface finish — an integral coating that significantly increases hardness and wear resistance for extended service life
• Advanced tooth profile with precision concentricity ensures accurate chain alignment and maximum power transfer
• Machined self-cleaning mud grooves at each tooth prevent debris buildup and increase wear resistance
• Computer-aided Ultralight design reduces unsprung rotational mass at the rear wheel for sharper throttle response

The hard anodized finish on the 490U series makes it particularly well-suited for road and road racing applications, offering all the benefits of Renthal's aluminum construction with enhanced longevity from the hardening process. The reduction in unsprung weight contributes directly to improved suspension performance, quicker acceleration, and more responsive handling — qualities that have made Renthal the choice of more factory race teams than any competing brand.