In under two years, Seattle e-bike startup Clean Republic has gone from prototype to delivery of more than 1,000 units. Clean Republic is a garage-based company that markets an e-bike conversion kit for the do-it-yourselfer as well as its Hill Topper electric bike kit -- basically a ready-to-install bike wheel with built-in electric assist motor.

The beauty of the Clean Republic Hill Topper is that it installs in just about 3 minutes and it’s relatively inexpensive. It's available with an 11-pound sealed lead acid (SLA) battery pack that delivers a 10-mile range or a more expensive lithium battery that weighs about 6 pounds and gives a 20-mile range. The Clean Republic Hill Topper is intended to assist, not replace the rider; as anyone who has been to Seattle knows, a little help on the hills can be very handy.

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