Bike in Cyprus

Posts Tagged ‘Bicycle Parts’

Wheel: The assembly consisting of the hub, spokes, rim, tire and tube.
Hub: The assembly at the center of the wheel that houses the axle bearings, and to which spokes attach.
Freehub: A hub and freewheel that have been combined into a single integrated assembly.
Spokes: The tensioned wires that join the hub and rim together.
Rim: The hoop at the outer edge of the wheel to which the tire is mounted.
Tire: The rubber hoop at the outer edge of the wheel assembly.

Headset: The bearing assembly that connects the fork to the frame and allows the fork to rotate inside the head tube.
Pedal: A mechanism that supports the rider’s foot. It contains a bearing assembly and is mounted to the crank arm.
Seat post: The pillar (usually a tube of metal) that attaches the seat to the frame.
Saddle: The soft structure that supports the rider’s posterior.
Stem: The piece that connects the handlebars to the fork.
Handlebar: The piece that supports the rider’s hands and is turned to control the bike.
Brake lever: The levers that are operated by the rider’s hands to control the braking function.
Shift lever: The levers operated by the rider’s hands that control the derailleurs.
Brake caliper: The mechanisms that squeeze against the rims to control the bike’s speed.

Derailleur: There are two such mechanisms: a front derailleur and a rear derailleur. The front derailleur moves the chain between the selection of gears on the crankset; the rear derailleur moves the chain between the selection of gears on the rear wheel.
Chain: The loop of links that connects the front gears to the rear gears.
Freewheel: The set of rear gears. Freewheels and freehubs have a confusing overlap of terminology.  In a general sense, the freewheel is the set of gears that the chain turns in order to apply drive forces to the rear wheel.
Crankset: The mechanism that is turned by the rider’s feet. It consists of two lever arms called crank-arms, one to three gears called chainrings, and a bearing assembly that the crank arms rotate around called the bottom bracket.
Bottom bracket: The bearing assembly that allows the crankset to rotate in the bottom-bracket shell.

Chapters on individual component areas of the bicycle have more specific terminology and definitions. For the purpose of this manual, the following terms apply to the frame and basic components.

Frame: The structural piece, usually a number of tubes joined together, to which all of the components are attached.
Fork: The structural piece that attaches the frame to the front wheel. The fork turns to allow the rider to control the bicycle.
Frame set: The frame and fork combination. Head tube: The near-vertical tube that is the forward most part of the frame.
Top tube: The upper tube of the frame that extends back from the head tube to the seat tube.
Down tube: The lower tube of the frame that extends from the bottom of the head tube to the bottom of the frame (the bottom-bracket shell).
Seat tube: The near-vertical tube that is at the middle of the frame, which the seat post slides into.
Bottom-bracket shell: The portion of the frame that contains the crankset bearing parts, which are called the bottom bracket.
Seat stay: The two tubes of the frame that start from below the seat and meet the chain stays at the center of the rear wheel.
Chain stay: The two tubes of the frame that go from the lower end of the seat tube and meet the seat stays at the center of the rear wheel.
Dropout: The fittings at the end of the fork, and at the juncture of the seat stays and the chain stays, to which the wheels are attached.