A crankarm, also know as crank arm and crank-arm, is the lever arm on a bicycle that attaches to the bottom-bracket spindle at one end and the pedal at the other end. The right crankarm has one or more chainrings — sometimes incorrectly called "gears" — attached to it, usually by means of chainring-mounting arms.
References
John Barnett, Barnett's Manual: Analysis and Procedures for Bicycle Mechanics (5th Edition).
A bicycle pedal provides the connection between the cyclist's foot or shoe and the crankarm allowing the leg to be used to turn the crank.
Pedals were initially attached to crankarms connecting directly to the driven (usually front) wheel.
The safety bicycle as we know it today came in to being when the pedals were attached to a crankarm driving a ring gear that was attached to the driven wheel by means of a chain.
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