Renthal 121U-420-47GBSI Ultralight Rear Sprocket 47T 420 Pitch Silver Anodized Aluminum

The Renthal 121U-420-47GBSI Ultralight rear sprocket is CNC machined from aerospace-grade 7075-T6 aluminum alloy at Renthal's facility in Manchester, UK. Designed for 420-pitch chain applications, this 47-tooth sprocket delivers race-proven reliability while weighing 66% less than a comparable steel sprocket — a meaningful reduction in unsprung mass that translates directly to improved acceleration and handling response.

Key Features:

• 7075-T6 aerospace aluminum construction for an exceptional strength-to-weight ratio
• 66% lighter than steel sprockets, reducing unsprung weight for sharper throttle response
• Computer-engineered tooth profile optimizes power transfer and chain engagement
• Grooved sprocket body promotes mud and debris clearance in off-road conditions
• Manufactured to tight tolerances for precise concentricity and consistent fitment
• Advanced surface treatment enhances wear resistance and extends service life
• 420 chain pitch compatibility
• 47 teeth
• Silver anodized finish for corrosion resistance and clean aesthetics

Renthal's Ultralight sprockets are a trusted choice among factory race teams worldwide. The combination of premium aluminum, proprietary surface treatments, and precision CNC manufacturing ensures optimal load dispersion across every tooth, extending both sprocket and chain life even under the most demanding race and trail conditions.