How to assemble Dream Bike Tricycle Conversion Kit "English version" - YouTube
Black Trike Conversion Kit for 12 inch Bicycle. Comes with Two 12 inch Hollow-Hub Wheel 36 Spoke. Tricycle, Trike, three-wheel bike conversion kit - Walmart.com
Amazon.com : Trike Rear Axle,Tricycle Conversion Kit 7 Speed, 5/8Inch Axle(15.8mm),Black Or White Frame .This Tricycle Part Suitable for Adult Bicycle Or Motorcycle. (Black) : Sports & Outdoors