Renthal Ultra-Light Self-Cleaning Aluminium 518U - 420 SprocketRef : RT00344A / 1129514002

RENTHAL Ultra-Light Mud-Resistant Aluminum Sprocket 518U - 420

Specifically designed for motocross, this Renthal 518U sprocket combines lightness and robustness for demanding relay races on muddy tracks. CNC machined in Manchester from 7075 T6 aluminum, it offers an advantageous weight-to-strength ratio — up to 66% lighter than steel — while maintaining precise geometry and good concentricity.

The mud-resistant design and tooth profiling facilitate debris evacuation during the race, limiting accumulation and promoting consistent transmission behavior. Its tooth profile is optimized for efficient power transfer to the rear wheel, suitable for the demands of motocross.

• Color: Orange
• Material: Aluminum (7075 T6, CNC machining)
• Number of teeth: 47
• Chain pitch: 420
• Type: Standard, mud-resistant
• Manufacturer reference: 518U-420-47GPOR
• Universe: Motocross — compatible notably with KTM 65 SX (2025) and GAS GAS MC 65 (2025)

A sprocket designed for riders who want to reduce unsprung weight while maintaining a reliable component for varying terrain conditions. Ideal for gearing adjustments on your small displacement motocross bikes.