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
Black Trike Conversion Kit for 24 inch Bicycle Comes with Two Chrome 24 inch Hollow-Hub Steel Wheel 36 Spoke. Tricycle, Trike, three-wheel bike conversion kit - Walmart.com
Trike+Plus Conversion Kit CD | Fabricating and Metalworking