bottom bracket

Bicycle component that is inserted into the bottom bracket shell. The bottom bracket consists of the crank axle (bottom bracket spindle), ball bearings, and (in older style bottom brackets) a fixed cup and an adjustable cup. Crankarms are bolted to the bottom bracket. Also see adjustable bottom bracket. sealed bottom bracket, splined bottom bracket, and square tapered bottom bracket

Dictionary of automotive terms. 2015.

Look at other dictionaries:

  • Bottom bracket — A square taper cartridge bottom bracket. The bottom bracket on a bicycle connects the crankset to the bicycle and allows the crankset to rotate freely. It contains a spindle that the crankset attaches to, and the bearings that allow the spindle… …   Wikipedia

  • bottom bracket — noun : bracket 2b …   Useful english dictionary

  • bottom bracket — part of a bicycle frame around which the pedals revolve (connected to the down tube and the chain stays) …   English contemporary dictionary

  • bottom bracket shell — The barrel shaped portion of the frame into which the bottom bracket is inserted. The seat tube, down tube, and chain stays are connected to the bottom bracket shell …   Dictionary of automotive terms

  • bottom bracket, adjustable — See adjustable bottom bracket …   Dictionary of automotive terms

  • bottom bracket, sealed — see sealed bottom bracket …   Dictionary of automotive terms

  • bottom bracket, splined — See splined bottom bracket …   Dictionary of automotive terms

  • bottom bracket, square tapered — see square tapered bottom bracket …   Dictionary of automotive terms

  • bottom bracket spindle — The axle to which both of the crankarms are attached. The spindle length is measured in millimeters from one end of the spindle to the other …   Dictionary of automotive terms

  • adjustable bottom bracket — [1] A component of a bicycle through which the crank fits. It has two bearing cups on either side. One cup is fixed in place while the other is removable or adjustable. [2] This is the older type of bottom bracket before sealed cartridge bottom… …   Dictionary of automotive terms

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