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racing bicycle is built using lightweight, shaped aluminium tubing and carbon fiber stays and forks. it sports a drop handlebar and thin tires and wheels for efficiency and aerodynamics. a bicycle (or bike) is a pedal-driven, human-powered vehicle with two wheels, one behind the other, attached to a frame
. the basic shape and configuration of a typical bicycle's frame, wheels, pedals, saddle, and handlebars have hardly changed since the first chain-driven model was developed around , [ ] although many important improvements have since been made, especially since the advent of modern materials and computer-aided...
https://www.newworldencyclopedia.org/entry/Bicycle