Bicycle

Bicycle
Bicycle: two-wheeled vehicle operated by pedals.
Rear caliper brake: piece that joins the different parts of the rear brake.
Seat post: metal tube that holds the seat.
Saddle: seat.
Cross bar: cylinder that connects the seat tube and the head tube.
Handlebar stem: metal tube used to steer the front wheel.
handle bars: metal tube used for steering.
Brake cable: braided steel cable used to control the brakes.
Brake lever: device used to operate the brake.
Head tube: cylinder that holds the handlebars and which connects the crossbar to the down tube.
Front caliper brake: piece that joins the different parts of the front brake.
Derailleur gear changer: lever used to shift the chain on a multi-speed bicycle.
Fork: piece formed of two parallel tubes, between which the wheel is fixed.
Down tube: cylinder onto which the crank gear is attached and which connects the down tube to the seat tube.
Spoke: long, thin piece of metal connecting the rim of a wheel to its hub.
Hub: central part crossed by the axle.
Rim: circle of metal forming the edge of a wheel.
Tire: hollow, air-filled casing made of rubber-covered fabric and steel.
Tire valve: system used to regulate the air in a tire.
Wheel: round object that turns around a central axle to allow the bicycle to advance.
Pedal: footed operated system used to propel a bicycle.
Crank arm: arm perpendicular to an axle, used to give it circular motion.
Drive chain: set of metal links that is used to transmit motion.
Rear derailleur: apparatus used to transfer the chain from one gear to another, situated at the rear of a bicycle.
Chain stay: part on which the bicycle rests.
Front derailleur: apparatus used to transfer the chain from one gear to another, situated at the front of a bicycle.
Seat tube: cylinder to which the seat is attached and which connects the down tube to the crossbar.

Photo :

EN : Bridge structure
FR : Structure de pont
ES : Estructura del puente

Bridge 
          structure

A bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. Designs of bridges vary depending on the function of the bridge and the nature of the terrain where the bridge is to be constructed.

Animation : Bike


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