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Ref : RT00383A / 1129513002
Renthal

Renthal Ultra-Light Self-Cleaning Aluminium Rear Sprocket 518U - 420 Sprocket

Recommended retail price: 71,95 €68,30 €

Compatibility

Check that this part fits your motorcycle

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Features

RENTHAL UltraLight 518U Sprocket - 420 (47 Teeth)

Designed for motocross riders seeking a lightweight and durable part, the RENTHAL UltraLight 518U sprocket is CNC machined in Manchester from 7075 T6 aluminum. Its lightweight construction (up to 66% lighter than steel depending on the material) reduces unsprung mass for a more responsive rear wheel behavior without compromising the rigidity needed for power transmission.

  • Material: CNC machined 7075 T6 aluminum
  • Color: silver
  • Number of Teeth: 47 (pitch 420)
  • Type: standard, mud profile
  • Manufacturer Reference: 518U-420-47GPSI

The tooth profile is designed for good torque transfer and uniform load distribution, while the mud profile geometry helps limit dirt accumulation on the teeth in muddy conditions. Ideal for motocross use, it fits 420 pitch transmissions and effectively replaces stock sprockets to enhance the machine's responsiveness.

Common compatibilities: KTM 65 SX (2025), GAS GAS MC 65 (2025) — check fitment on your model before installation.