Handlebars

A cylindrical, straight or curved steering bar, usually fitted with handles at each end, as on a bicycle. Often used in the plural.

Spokes

One of the rods or braces connecting the hub and rim of a wheel.

Cranks

A device for transmitting rotary motion, consisting of a handle or arm attached at right angles to a shaft.

Freewheel

A clutch in the rear-wheel hub of a bicycle that permits the wheel to turn without pedal action, as in coasting.

Pedals

A similar foot-operated part attached to a crank and used for powering various devices, such as a bicycle.