Caster Wheel
Pronunciation: KAS-ter
A small, swivelling front (or rear) wheel on a manual or powered wheelchair that provides directional freedom, contributing to manoeuvrability.
Full Definition
Caster wheels are the smaller, non-drive wheels on a wheelchair that swivel 360° to allow changes in direction. On a standard manual wheelchair, casters are positioned at the front; on rear-wheel-drive powered chairs, they may be at the front, rear, or both. Caster diameter, width, and material (solid rubber, pneumatic, polyurethane) affect rolling resistance, obstacle-climbing ability, and ride comfort—all clinically relevant variables documented in wheelchair prescription forms and seating reports. Editors should preserve precise descriptions of caster size and material, as substitutions affect terrain capability and require updated HCPCS documentation. 'Caster' should not be confused with 'castor' (the latter is an accepted British English spelling variant).
Usage
Usage note: 'Caster' (US) and 'castor' (UK) are both acceptable but should be consistent within a document. Do not confuse with anti-tip wheels, which are fixed, non-swivelling.
In Context
- "The therapist specified 5-inch pneumatic caster wheels to improve performance on the client's uneven garden path." — Wheelchair prescription form
- "Editors in US-based publications should use 'caster'; those in UK-based publications may encounter the spelling 'castor'—confirm house style." — Editorial style note