• Wheel = the entire setup of the rim, tire, tube, spokes, and hub.
• Rim = the metal hoop the spokes are laced to and the tire & tube sit on.
• Hub = located in the center of the wheel from which the spokes radiate outward.
• Rim Strip = the rubber, cloth or plastic covering over the spoke nipples.

• Presta Valve	Schrader Valve

  
  
• Headset = bearing component that secures the fork to the frame. Can be either threaded or threadless.
• Stem = holds the handlebars and mounts to the steerer tube on the fork.
  
  
• Crank = the drivetrain parts consisting of the crankarms and chainrings.
• 1-Piece = arms and axle are forged as one piece
• 2-Piece = one arm and the axle are forged as one piece; other arm is separate
• 3-Piece = arms and axle are separate (usually preferred for strength)
• Bottom Bracket = consists of the crank axle (bottom bracket spindle) and ball bearings
• American
• European
• Chainwheel = mostly solid front gear used for single-speed bikes. Often called a sprocket.
• Chainring = ring-shaped front gear often used for multi-speed bikes or BMX race bikes.
• Freewheel = a style of gear cluster which threads onto the rear hub.
• Cassette = a style of gear cluster that slides onto the rear hub. Generally lighter than freewheels.
  
  
• Derailleur = front and rear gear changing devices. Moves the chain across the cassette and front chainrings.
• Chainstay = the frame tubes that run horizontally from the bottom bracket shell to the rear dropouts where the wheel is attached.

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