Wheels

A wheel is a rotating component (typically circular in shape) intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle, which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily, facilitating transportation, supporting loads, and performing work in machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel, potter's wheel, and flywheel.

torture device used for capital punishment

A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. thumb|right|A spoked wheel on display at the National Museum of Iran, in [[Tehran. The wheel is dated to the late 2nd millennium BCE and was excavated at Choqa Zanbil.]] thumb|right|The remains of a pair of cart wheels with metal axle assembly. thumb|right|An ox-wagon in [[Aliwal North, South Africa. Note the three missing spokes and the metal tire.]] right|thumb|Wooden spoke wheel with metal rim from antique truck on display in Under

thumb|A wheelwright's shop

wheel designed for a bicycle

outer part of a wheel on which the tire is mounted

machine for rodent exercise and play

wooden wheel found near Ljubljana, Slovenia

type of omnidirectional wheel

thumb|The Tweel airless tire design

thumb|A swivel caster A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved.

component of a computer mouse used to scroll up and down

wheel that can move along multiple axes

wheels whose rims connect to their hubs by wire spokes

type of wheel used to transit over irregular terrain

composite wheels of North American railway carriages