420 Primary Drive Sealed X-Ring Replacement Chain | Surron Ultra Bee RonixMods Black Carbon rollers

Black Carbon rollers

HUSQVARNA WR 360 2002

HUSQVARNA TE 250 (Braktec caliper) 2023

14mm shaft — 50% larger than most coils on market to handle large side-loading events

420 Primary Drive Sealed X-Ring Replacement Chain | Surron Ultra Bee RonixMods Black Carbon rollers420 Primary Drive Sealed X Ring Replacement Chain Sur Ron Ultra Bee Replacement 420 sealed X ring chain designed specifically for use with DirtyBike primary belt to chain conversion kits for Sur Ron Ultra Bee. Built to handle the demands of electric drivetrains, the X ring design reduces friction while retaining lubrication for consistent, long service life. This chain is a direct fit for DirtyBike 420 primary conversion kits for the Ultra Bee. Key