Wattcycle.com sells ultra-fast electric (e-bike) conversion kits for your existing bicycle. Top speed on some of our bikes exceed 50 MPH! (72V 40A Phoenix Racer System)

Basically we're out here trying to show people that bikes are cool again and if you have a heavy old bike that you're not using anymore (or even a new cheapie from Walmart) you can turn it into a favorite toy - that will actually pay for itself by saving gas.