FSA Yamaha Alloy E-MTB Chain GuardThis electric bike (E-bike) chainring features a hard-wearing alloy construction, which allows it to handle the increased speeds and torque produced by electric motor systems. This model is compatible with Yamaha E-bike engines.Features: Material: Alloy Use: E-bike BCD: 104 Engine Compatibility: Yamaha Part Number: 4713170266768Buy FSA Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.