Learning to ride a bicycle seems to be a universal experience for children around the world. Whether you've been riding bicycles since you were a child or just recently started pedaling, how much do you know about this elegant and simple vehicle?
Bicycles originated in Europe in the 19th century.
A bicycle's core, or frame, is made of several metal tubes welded together.
The front fork is the movable part of the frame that holds the front wheel.
A bicycle's ball bearings, which need to be cleaned out and have fresh grease added periodically, reduce friction.
Ball bearings are found in the bicycle's front and rear hubs as well as the bottom bracket, fork tube, pedals and freewheel.
Penny-farthing bicycles, also known as "high-wheeler bicycles," became popular starting in 1870.
A chain connects a bicycle's pedals to the rear wheel.
Just like in a child's tricycle, the pedals are directly connected to the bicycle's front wheel.
Gears and gear ratios allow bicycles to have smaller wheels.
Standard bicycles have wheels that are 26 inches (660 millimeters) in diameter.