The Unlimited E-Bike Conversion Kit is the simplest, lightest e-bike conversion system in the world; turning your existing bike into a powerful electrified one in just minutes. The kit consists of just 3 parts: A replacement front wheel with an internal 250W or 750W motor, a bottle cage-mount screw-on battery, and a strap-on wireless sensor. Battery & motor options offer ranges from 22-50 miles & pedal-assist speeds from 16-22MPH. Fits most bikes.