Amazon.com : Black Trike Conversion Kit for 20 inch Bicycle. Comes with Two 20 inch Hollow-Hub Steel Wheel 36 Spoke. Tricycle, Trike, Three-Wheel Bike Conversion kit : Sports & Outdoors
VINTAGE! 12-16 TRIKE CONVERSION KIT 1 SPEED COASTER 5/8 AXLE IN CHROME OR BLACK. | eBay
Tricycle Conversion Kit 7 speed and disc brake | tricycleconversion
Trailmate E-Kits / Tricycle Electric Conversion Kit
Electric Baja Trike Conversion Kit System w/ 48v Li-Ion Battery