<http://schema.org/caption>
"Rennholz features custom 16-inch rims at the front and a 20-inch rear wheel, all using Schwalbe Kojak tires, with a caliper brake providing stopping power at the rear"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/renholz-drill-powered-trike/22186/>