Renthal 404U-520-47P-HA Ultralight Rear 520 Conversion Sprocket 47T Aluminum

The Renthal Ultralight Rear Sprocket (404U-520-47P-HA) is a high-performance 47-tooth, 520-pitch rear chainwheel engineered for the extreme demands of Supercross, Motocross, and Enduro competition. Precision-manufactured from 7075-T6 aerospace-grade aluminum alloy, this sprocket delivers an impressive 66% weight reduction compared to a standard steel sprocket — without sacrificing durability or strength.

Key Features:

• 7075-T6 Aluminum Construction — High-strength aerospace alloy provides exceptional durability at a fraction of steel's weight
• 520 Pitch Conversion — Designed for riders converting to the lighter, narrower 520 chain format for reduced drivetrain weight
• 47-Tooth Configuration — Precision tooth count for optimized gearing ratios
• Advanced Tooth Profile — Engineered for maximum power transfer, superior chain engagement, and extended service life
• Tight Manufacturing Tolerances — Exceptional concentricity and accuracy of fit minimize drivetrain wear and vibration
• Hard-Anodized Surface Treatment — Renthal's proprietary surface hardening process significantly extends sprocket life beyond standard aluminum chainwheels
• Self-Cleaning Mud Grooves — Strategic cutouts in the sprocket body expel dirt and debris to maintain consistent performance in off-road conditions
• Ultralight Cutout Design — Material-relieved body reduces rotational mass for improved throttle response and handling

Renthal's combination of a very high-strength base material and an exceptionally hard-wearing surface treatment results in a rear sprocket that outlasts conventional aluminum options while keeping unsprung and rotating weight to a minimum. Trusted by factory race teams worldwide, the Renthal Ultralight series is the benchmark for off-road competition sprockets.