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"This rugged electric bike conversion kit, which is robust enough for offroad cycling, offers a unique feature that uses your heart rate to control the amount of assistance coming from the motor."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/bikes/new-electric-wheel-kit-converts-any-bike-cardio-controlled-offroad-ebike.html>