Amazon.com : Chrome Trike Conversion Kit for 12 inch Bicycle. Comes with Two 12" Hollow-Hub Wheel 36 Spoke. Tricycle, Trike, Three-Wheel Bike Conversion kit : Sports & Outdoors
Black Tricycle Conversion Kit 5/8" Axle Hollow Hub Fixed Sprocket New | eBay
CHROME TRICYCLE CONVERSION KIT 5/8" AXLE HOLLOW HUB WHEELS for 12" or 16" BIKES | eBay
Amazon.com : Lowrider Black Trike Conversion Kit for 26 inch Bicycle. Comes with Two Chrome 26 inch Hollow-Hub Steel Wheel 72 Spoke. Tricycle, Trike, Three-Wheel Bike Conversion kit : Sports & Outdoors
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