I put a Currie conversion kit on my 21-speed mountain bike last year. With aggressive knobby tires that increase rolling resistance and reduces speed and using the standard SLA battery, my top speed is 17 MPH. With different tires that have less rolling resistance, the speed could easily be increased by 2 MPH. The area where the Currie motors shine is torque. I live in the far northern US Rockies and the Currie motor is awesome--handling hills with significant grades with ease. In my opinion, you can't beat the bang for the buck buying an IZip or Ezip, especially the less expensive, non-hub models.
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