1) Cycle type 
==Definition== 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. Later historians began to use the term in a more restricted way, for the design that was a direct ancestor to most modern bicycles. `Diamond frame` is also sometimes used as a term f.....
• A bicycle with equal or nearly equal wheels, usually 28 inches diameter, driven by pedals connected to the rear (driving) wheel by a multiplying gear.
(from the article `bicycle`) As the ordinary was developing, numerous designs offered safer alternatives, including tricycles, gearing to allow smaller front wheels, and treadle ...
Safety bicycle A bicycle with equal or nearly equal wheels, usually 28 inches diameter, driven by pedals connected to the rear (driving) wheel by a multiplying gear. 
[n] - bicycle that has two wheels of equal size
safety bike noun bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear