Chrome Trike Conversion Kit for 16 inch Bicycle. Comes with Two 16 inch Hollow-Hub Wheel 72 Spoke. Tricycle, Trike, three-wheel bike conversion kit - Walmart.com
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
Tricycle Conversion Kits for sale | eBay
24 Volt 450 Watt Gear Motor DIY Electric Tricycle Power Kit with Reverse # KIT-140