You have two choices: The E350 contains a robust 350 watt motor driving the rear wheel, and is ideal for riders whose typical ride is flat urban terrain. The E500 has a dedicated 250 watt motor in each wheel, supplying 500 watts and 26 newton meters of torque so you can easily tackle hills with steep inclines. Our motors are completely custom-built utilizing rare-earth neodymium magnets and a monitoring system to prevent overheating. It’s been painstakingly optimized for performance, efficiency, responsiveness and longevity.