Crank gear: mechanism comprised mainly of pedals, cranks and a chain wheel that drives a bicycle.
Frame: chassis of a bicycle.
Cone: roller bearing.
Fixed cup: metal plate covering the ball bearings.
Chain wheel: support that holds a disk clutch.
Pedal: foot-operated system used to propel a bicycle.
Crank arm: arm perpendicular to an axle, used to give it circular motion.
Ball bearings: ball-bearing mechanism used to reduce friction between pieces rolling on each other.