The Serpent SER903732 2-speed gear 56T XLI Gen2 is a track-capable unit for the Viper 989 GP chassis, focused on delivering steady ratio changes under load. It is intended for racers and hobbyists who value predictable drivetrain behaviour.
Fit the gear into a clean gearbox and verify mesh with the mating gear before final torque. Keep the area free of debris and recheck the assembly after the first few runs to confirm stable operation.
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