All Rickshaws and Vangari’s in Bangladesh have only a single gear. It’s something like 61 gear inches and way to stiff when under load. We adapted a vangari with a retro-direct drive system which means that if you pedel backwards you get a different gear. The upshot of this over a normal geared system with derailleurs is that it uses much fewer parts and is potentially more rugged. This first attempt has got some issues to work out but it might have some potential. Here’s the Video.