Crank may refer to:


  • Crank conjecture, a term coined by Freeman Dyson to explain congruence patterns in integer partitions.
  • Crank, a college slang term for a numerologist or a practitioner of pseudomathematics.


  • Crank, in mechanical engineering, a bent portion of an axle, or shaft, or an arm keyed at right angles to the end of a shaft, by which motion is imparted to or received from it
  • Crankshaft, the part of a piston engine which translates reciprocating linear piston motion into rotation
  • Crankset, the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain, which in turn drives the rear wheel



Popular culture


  • Crank, a disparaging term for a person who holds unorthodox opinions
  • Crank calls, a term for false telephone calls made to strangers
  • Crank, a slang term for the powdered form of the recreational drugs methamphetamine or amphetamine


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