A bicycle saddle, sometimes called a bicycle seat, is one of five contact points on an upright bicycle, the others being the two pedals and the two handles on the handlebars. (A bicycle seat in the specific sense also supports the back.)[1] The bicycle saddle has been known as such since the bicycle evolved from the draisine, a forerunner of the bicycle.[2][3] It performs a similar role as a horse's saddle, not bearing all the weight of the rider as the other contact points also take some of the load.
A bicycle saddle is commonly attached to the seatpost and the height of the saddle can usually be adjusted by the seatpost telescoping in and out of the seat tube.
Before starting, one has to screw the saddle just to such a height that the feet still stand on the ground...
4. A fixed seat for the rider of a bicycle, motorcycle, etc. 1819 Belles-lettres Repository May 31/2 The Velocipede, or Swift-walker... consists of two wheels, one behind the other, connected by a perch, on which a saddle is placed for the seat of the traveller... The saddle may be raised or lowered..at pleasure, and thus suited to the height of various persons.