Manufacturer reference: 189U-420-55GRSI — RENTHAL Ultra-Light mud-resistant sprocket 189U - 420
Designed for motocross and enduro riders seeking lightweight and reliability, the Renthal Ultralight™ mud-resistant sprocket is machined from 7075 T6 aluminum to provide an excellent balance between reduced weight and mechanical strength. Its specific tooth profile facilitates mud evacuation and minimizes performance losses related to chain/sprocket friction.
- Material: 7075 T6 aluminum, anodized for a harder surface and better abrasion resistance.
- Number of teeth: 55 (engine compatibility and standard gearing).
- Chain pitch: 420 — common format for motocross and small displacement bikes.
- Mud-resistant design: tooth profile and strategic cutouts to evacuate debris without sacrificing strength.
- Color: silver, aesthetically pleasing and protective anodized finish.
The Renthal 189U is aimed at MX, SX, or enduro practitioners looking to reduce unsprung inertia and improve transmission responsiveness. Compatible with several models, it is particularly suited for Honda CRF 150 R (all listed variants). A sprocket designed to last, withstand the demands of the terrain, and keep the chain smooth even in muddy conditions.
