Movable back supports that can be moved in many different axes about a seat and fixed in a position desired by a user are contemplated. Movable back supports comprise sliding members, straps, and a tightening mechanism that alters tension in the straps. Contemplated movable back supports can be positioned at a desired height relative to a backrest and at a desired distance from backrest rails of the seat. Furthermore, contemplated movable back supports can be moved forwardly into a back of a user or rearwardly away from the back of the user.

A seat back angle and depth adjustment assembly includes an angle adjustment member that includes a first aperture and a second aperture, a first fastener is received by the first aperture and is configured to engage an angle adjustment locking member, and a second fastener is received by the second aperture and is configured to engage a depth adjustment locking member.

Movable back supports that can be moved in many different axes about a seat and fixed in a position desired by a user are contemplated. Movable back supports comprise sliding members, straps, and a tightening mechanism that alters tension in the straps. Contemplated movable back supports can be positioned at a desired height relative to a backrest and at a desired distance from backrest rails of the seat. Furthermore, contemplated movable back supports can be moved forwardly into a back of a user or rearwardly away from the back of the user.

An expandable wheelchair device for adjusting dimensions of the wheelchair to accommodate variously sized users includes a chair having a seat and a back rest. The seat includes a pair of seat rods that are each extendable and retractable. The back rest includes a pair of back rest rods that are each extendable and retractable. A support is positioned beneath the seat to support the chair above a surface. A pair of drive wheels is rotatably coupled to the support proximate to a junction between the seat and the back rest. A pair of front wheels is rotatably coupled to the support and is spaced from the pair of drive wheels.