The central kit excels especially by its light weight and simple installation.The motor assembly is done to the centre of frame instead of pedal. The motor installed in the center of frame, results in optimum center of gravity without limiting riding qualities. The engine is designed for central axis of 68-72 mm or 100 mm. You can choose from 250W to 1000W. The conversion is so versatile that it can be installed on 99% of the series produced wheels.