TRIS BIKE is powered by ZEHUS technology: brushless motor, batteries and an innovative 4-sensor system are all integrated in the rear hub. Everything stays within 180 mm diameter and 120 mm width. There is no wire to obtain a very elegant solution. With a battery capacity of 172 Wh and a weight of just 3 kg our all- in-one hub has the highest energy/weight ratio on the market. The mode of operation of the ZEHUS motor is very intuitive: as soon as you start pedalling, the motor will start pushing! If you want to recharge the batteries, you just need to plug the charger into the rear spin axis. The full charging time is 3 hours.