Thesixave789-6 via eBay offers its Sixave 48-volt 1,000-watt 26" Wheel Electric Bike Motor Conversion Kit for $133.99 with free shipping. That's $11 under our October mention and the lowest price we've seen. (It's the best deal now by $7.) It features a motorized wheel, electric controller, speed throttle, power breaks, and wire harness.
Note: This system requires a 48-volt battery (not included) for use.
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