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1 A caster is a wheel mounted to a fork, with an optional, additional offset steering joint. 2  An omni-directional wheel (Mecanum wheel, Omni wheel, or Swedish wheel) is made of a large central hub with many additional smaller wheels mounted along the perimeter such that their axes are perpendicular to the central wheel.
The following is VERY basic information about casters and caster wheels. You may find it informative. A wheel and a caster are not the same thing, but often these words are used to refer to the same object. When a customer uses the words, wheel and caster interchangeably, it often creates confusion. Here is the difference: A wheel is a round object that rolls.