The bicycle is the world's most popular form of transport. From the penny-farthing, the Dandy-horse and the Velocipede the design of the bicycle has evolved over the decades both in terms of style and technology. From high-performance cycles to practical run-arounds, conceptual bikes to commercial models, Alex Newson explores the 50 most important, pivotal bicycles from around the world.

The bicycle is the world's most popular form of transport. From the penny-farthing, the Dandy-horse and the Velocipede the design of the bicycle has evolved over the decades both in terms of style and technology. From high-performance cycles to practical run-arounds, conceptual bikes to commercial models, here are the 50 most important, pivotal bicycles from around the world.