Shift tricycle

Industrial designers from Purdue University have invented the Shift tricycle, whose rear wheels move closer together as the rider picks up speed, then separate for easier balance at slower speeds or at a standstill. A spring-loaded mechanism in the rear hub controls the rear wheels, and there are no spokes or exposed bike chain. The 25-lb. aluminum trike won an international bike-design competition in Taiwan. Now its creators want to produce it commercially.

Source: designapkin.comAdded: 4 July 2006