Black Trike Conversion Kit for 20 inch Bicycle. Comes with Two 20 inch Hollow-Hub Steel Wheel 72 Spoke. Tricycle, Trike, three-wheel bike conversion kit - Walmart.com
Traditional Tricycle Conversion Kit w/ Li-Ion Battery | E-TrikeKit™
RCC/PBE15: Cruzbike Shows Prototype Leaning Trike Conversion, Carbon Seat Box for Front Wheel Drive Recumbents - Bikerumor
Bicycle Trike Conversion Kit
Black Tricycle Conversion Kit 5/8" Axle Hollow Hub Fixed Sprocket New | eBay
Trike Conversion Kit 7 Speed 2407-T Black and 24" 36/SpokeTrike Alloy Hollow-Hub Left & Right Wheel Set : Amazon.ca: Sports & Outdoors