Bicycles

• bicycle

  /ˈbaɪsək(ə)l/ (noun)
  A vehicle composed of two wheels held in a frame one behind the other, propelled by pedals and steered with handlebars attached to the front wheel.

• brake lever

  /breɪk lɛvər/ (noun)
  A rigid bar resting on a pivot, which when pressed applies the brake, slowing or stopping a moving vehicle.

• chain

  /tʃeɪn/ (noun)
  A connected flexible series of metal links used for fastening or securing objects and pulling or supporting loads.

• crank

  /kræŋk/ (noun)
  A part of an axle or shaft bent out at right angles, for converting reciprocal to circular motion and vice versa.

• derailleur

  /dəˈreɪlər/ (noun)
  A bicycle mechanism that moves the chain out and up, allowing it to shift to different cogs.

• handlebar

  /ˈhændlˌbɑr/ (noun)
  The steering bar of a bicycle, motorcycle, scooter, or other vehicle, with a handgrip at each end.

• helmet

  /ˈhɛlmət/ (noun)
  A hard or padded protective hat, various types of which are worn by soldiers, police officers, firefighters, motorcyclists, athletes, and others.

• hub

  /həb/ (noun)
  The central part of a wheel, rotating on or with the axle, and from which the spokes radiate.

• pedal

  /ˈpɛdl/ (noun)
  Each of a pair of foot-operated levers used for powering a bicycle or other vehicle propelled by the legs.

• saddle

  /ˈsæd/ (noun)
  A seat for riding, typically made of leather.

• seat

  /sit/ (noun)
  A thing made or used for sitting on, such as a chair or stool.

• spoke

  /spoʊk/ (noun)
  Each of the bars or wire rods connecting the center of a wheel to its outer edge.

• sprocket

  /ˈsprɑkət/ (noun)
  Each of several projections on the rim of a wheel that engage with the links of a chain or with holes in film, tape, or paper.

• tire

  /ˈtaɪ(ə)r/ (noun)
  A rubber covering, typically inflated or surrounding an inflated inner tube, placed around a wheel to form a flexible contact with the road.

• tread

  /trɛd/ (noun)
  The thick molded part of a vehicle tire that grips the road.

• wheel

  /wil/ (noun)
  A circular object that revolves on an axle and is fixed below a vehicle or other object to enable it to move easily over the ground.