Ultra Motor 2nd Reduction Gear model version_Ultra Duo Step-Over 3 Juggernaut XD Duo

Juggernaut XD Duo

Powerful eBikes need reliable brakes

Replacement rear wheel w/motor for the Challenger 1

This bundle includes the hub and adaptor to fit your hub spacing and axle type (if applicable)

Ultra Motor 2nd Reduction Gear model version_Ultra Duo Step-Over 3 Juggernaut XD DuoDirect replacement second reduction gear for the Bafang Ultra M620 motor systems. This precision engineered component restores optimal power transfer and torque delivery when wear or damage affects your motor's performance. Compatible with Ultra M620 equipped e bikes. Essential maintenance part for riders seeking reliable drivetrain function and extended motor lifespan.