Electric Bike 27.5In 500W Adults City Commuting E-Bike Mountain Bicycle. Standard 500W geared motor, provides superior power and torque. 🚴SHIMANO 21-SPEED GEARS : Front Derailleur Shimano Tourney 3-Speed + Rear Derailleur Shimano Tourney 7-Speed; With the right gear, you can conquer any terrain with efficiency.