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Amazon.com : BAFANG 48V 500W Rear Hub Motor : 20" Electric Bike Conversion Kit for 20 Inch Rear Cassette Wheel with 500C Display & PAS, Ebike Kit for Mountain Road Commuter Bicycle (
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48V 1000W Cassette Electric Bike Conversion Kit Rear Wheel Motor Kit MTB CST Electric Bicycle Hub Motor E Bike Kit - AliExpress
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