Boaters have special requirements for a bicycle. It needs to fit into small spaces, it needs to be rust proof, and it needs to be able to handle some abuse. Hence a folding bike with an internal hub and belt drive ( or stainless steel chain ) are ideal. Rear derailleurs can bend on a boat, additionally they require thin chains that always rust. Overall boaters love our miniB, or 8H/11H with belt drives. Below are pictures of an older Downtube folding bike on a sailboat. It is perfect for buying groceries when docked, or just tootling around town.