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The term 'safety bicycle' was used in the 1880s for any alternative to the penny-farthing. The front and rear wheel were not necessarily the same size. [3] Later historians began to use the term in a more restricted way for the design that was a direct ancestor to most modern bicycles.
ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear.
The first was the chain drive, originally used on tricycles, allowing a gear ratio to be chosen independent of the wheel size. The second was the pneumatic bicycle tire, allowing smaller wheels to provide a smooth ride. An 1880 penny-farthing (left), and the first modern bicycle, J. K. Starley's 1885 Rover safety bicycle (right)
The wheel size is sometimes erroneously called "650B" [8] [9] as a "marketing term" by some manufacturers for their 27.5", but the 650B size has traditionally been a designation for a 26 inch diameter (ISO ~ 40-584 demi-ballon tire) using the same ISO 584 mm rim [10] used by French tandems, Porteurs and touring bicycles.
A small wheel bicycle, such as a Moulton Bicycle, has a traditional seating position and small wheels. A portable bicycle, such as a Strida, is a folding bicycle that is small and light enough to be easily carried afoot or in a cramped vehicle. An exercise bicycle remains stationary; it is used for exercise rather than propulsion.
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Another advantage of both wheels being the same size is that the bike requires only one size of inner tube. One common arrangement is an ISO 559 (26-inch) rear wheel and an ISO 406 or ISO 451 (20-inch) front wheel.
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