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Views: 0 Author: Site Editor Publish Time: 2026-09-21 Origin: Site
Whether you are specifying a new wheelchair program, sourcing replacement components, or simply need to name a part correctly on a drawing, the vocabulary matters. This guide lists the parts of a wheelchair by position, explains what each one does, and notes what matters when those parts are manufactured for an OEM program.
The parts of a wheelchair fall into six groups: the frame (the structural chassis), the wheels and casters, the seating system (seat, backrest, armrests), the footrests and legrests, the brakes and control components, and — on powered chairs — the motor, battery, and controller. The frame is the part every other component attaches to, which is why its material and welding quality determine the chair's strength, weight, and service life. Huang Wei, a Taiwan-based aluminum welding manufacturer with 30+ years of experience and ISO 9001 certification since 2012, has manufactured aluminum wheelchair frames and parts for a Canadian wheelchair brand since 2010.
A wheelchair is built in layers. At the bottom are the rear wheels and front casters, which carry the load and steer. Above them sits the frame — rigid or folding — which is the load path between the user and the ground. The seat, backrest, and armrests mount to the frame, the footrests hang from its front, and the brakes clamp to it beside the rear wheels. On a power wheelchair, the motors, battery pack, and joystick controller are added to the same chassis. Every part below is described in that order.
The frame is the wheelchair's chassis: the welded tube structure that carries the user's weight, holds every other component in position, and absorbs the shocks of daily use. It is the single most important part for durability. Wheelchair frames are typically made from aluminum alloy or steel, with aluminum preferred where weight, corrosion resistance, and easier handling matter. Because a frame is a set of tubes joined at load-bearing points, the quality of each welded joint decides whether the chair stays rigid and square over years of use.
A folding wheelchair frame adds a cross-brace (also called an X-brace or scissor mechanism) between the two side frames, allowing the chair to collapse sideways for transport. The seat sling attaches across the top of the brace, and the folding action relies on pivots at the top and bottom of the cross-brace. Because the brace carries load every time the user sits, its pivot points and welded joints must be built to tighter standards than a rigid frame's. A rigid frame omits the brace and is stiffer and lighter, but does not fold.
The side frames are the two vertical assemblies that run from the front casters to the rear wheels on each side. The seat rails are the horizontal tubes along the top of each side frame that support the seat upholstery or seat pan. The axle plate (or camber bar on active chairs) is the bracket at the rear of each side frame that holds the rear wheel axle; it often has multiple mounting positions so the seat height and center of gravity can be adjusted. All three are welded to, or form part of, the main frame.
The rear wheels are the large drive wheels — usually 22 to 26 inches on a manual chair — that carry most of the user's weight. Each rear wheel includes a tire (pneumatic or solid), a rim, spokes or a molded mag wheel, a hub with bearings, and a quick-release or fixed axle. On a manual wheelchair the rear wheel also carries the handrim (push rim), the outer ring the user grips to propel the chair. Rear wheels are the parts most often replaced over a chair's life.
Casters are the small front wheels — typically 4 to 8 inches — that swivel to steer the wheelchair. Each caster sits in a caster fork, which pivots on a caster stem mounted in the caster housing at the front of the frame. Caster size is a trade-off: smaller casters turn faster and take less space, larger casters roll more easily over thresholds and rough ground. The caster housing is a welded part of the frame and must be aligned precisely so the chair tracks straight.
Anti-tip bars (anti-tippers) are short tubes with small wheels that extend behind the rear wheels, close to the ground. They stop the wheelchair from tipping backward when the user leans back, climbs a ramp, or hits a bump. They are usually removable or flip-up so they can be cleared for curb climbing. Anti-tip bars mount into receiver tubes welded to the rear of the frame.
The seat is the surface the user sits on. On folding chairs it is a sling of upholstery stretched between the seat rails; on rigid chairs it may be a solid seat pan. A seat cushion — foam, gel, or air — sits on top and provides pressure relief and posture support. Seat width and depth are the two primary sizing dimensions when specifying a wheelchair, and both are set by the frame geometry.
The backrest is the surface that supports the user's back. It is stretched between or mounted on two vertical tubes called back canes (or back posts), which rise from the rear of the side frames. Back canes may fold down for transport and often carry the push handles at their top. Backrest height and angle are set by the back canes, which are welded or clamped to the frame.
Armrests support the user's forearms and help with transfers; they may be fixed, flip-back, swing-away, or height-adjustable, and they mount to the side frames via armrest receivers. Push handles are the grips at the top of the back canes that let an attendant push the chair. Both are simple parts, but their mounting points are welded to the frame and must be positioned accurately for the chair to be comfortable.
Footrests support the user's feet. Each footrest consists of a hanger (the angled tube that drops from the front of the frame), a footplate (the platform the foot rests on), and a heel loop or strap. Footrest hangers are usually swing-away or removable to make transfers and standing easier. Elevating legrests are a variation that add a calf pad and can be raised to hold the leg straight. Hangers attach to receivers welded at the front of the side frames.
Wheel locks (often called brakes) are lever mechanisms mounted on the frame beside each rear wheel that press a bar against the tire to hold the wheelchair stationary. They are parking brakes, not slowing brakes — they are designed to keep the chair still during transfers, not to stop it while moving. Push-to-lock and pull-to-lock are the two common types. Attendant chairs may add attendant brakes on the push handles.
A power wheelchair adds three systems to the basic chassis. The motors (usually two, one per drive wheel) drive the chair; the battery pack, mounted low on the frame, supplies power; and the controller — typically a joystick module on the armrest — lets the user steer and set speed. These parts add considerable weight, so an electric wheelchair frame is reinforced at the motor mounts and battery tray. Related mobility products, such as electric mobility scooters, use the same principle: a welded aluminum frame carrying a battery, motor, and seat.
A manual wheelchair is propelled by handrims on the rear wheels; a power wheelchair is propelled by motors and steered by a controller. The seating, footrest, and caster parts are largely the same. The differences are in the frame — a power chair frame is heavier-duty, with mounts for motors and a battery tray — and in the wheels, which are smaller on a power chair because they no longer need handrims. For a more detailed comparison, see our wheelchair parts and materials OEM guide.
Every load in a wheelchair passes through the frame's welded joints — the caster housing, the axle plate, the cross-brace pivots, the footrest and backrest receivers. A joint that is under-penetrated or distorted will loosen, creak, or crack long before any bolt-on part wears out. For aluminum wheelchair frames, TIG welding gives the controlled heat input and clean weld bead that thin-wall aluminum tubing requires, and T4/T6 heat treatment after welding restores the alloy's strength around the heat-affected zone. Huang Wei has run TIG welding for aluminum frames for 30+ years, added T4/T6 heat treatment in 2018, and introduced an automated robotic welding system in 2019 for consistent, repeatable joints.
Three things: whether the supplier controls the full process in-house (design and development support, material preparation, welding, heat treatment, grinding, and finishing), whether it holds a recognized quality management certification, and whether it has a track record in the medical mobility sector. Huang Wei has manufactured aluminum wheelchair frames and parts for a Canadian wheelchair brand since 2010, operates under ISO 9001 (certified 2012), and completed a third plant in 2025 for vertically integrated, one-stop production. Its medical line covers wheelchairs, walkers, and mobility scooters, alongside its long-standing OEM work for bicycle brands and Taiwan's high-speed rail seating.
What are the main parts of a wheelchair?
The main parts of a wheelchair are the frame, the rear wheels with handrims, the front casters and forks, the seat and cushion, the backrest and back canes, the armrests, the footrests or legrests, the wheel locks, and the push handles. A power wheelchair adds motors, a battery pack, and a joystick controller. The frame is the structural core that every other part attaches to, which is why frame material and welding quality matter most for durability.
What is the frame of a wheelchair made of?
Most wheelchair frames are made of aluminum alloy or steel. Aluminum is the common choice for manual and active wheelchairs because it is lighter, corrosion-resistant, and easier for users and attendants to handle. Steel is heavier but lower in material cost. Aluminum frames are typically TIG welded and then T4 or T6 heat treated to restore strength. Huang Wei manufactures aluminum wheelchair frames and parts on this basis for OEM programs.
What is the difference between a caster and a rear wheel on a wheelchair?
Casters are the small front wheels that swivel to steer the wheelchair; rear wheels are the large wheels that carry most of the load and, on a manual chair, carry the handrims used to push. Casters sit in forks that pivot in a housing welded to the front of the frame. Rear wheels mount on an axle plate at the back of the frame, which often allows the seat height and balance point to be adjusted.
What are the parts of an electric wheelchair?
An electric wheelchair has the same seating, footrest, and caster parts as a manual chair, plus three power components: two drive motors, a battery pack mounted low on the frame, and a controller — usually a joystick on the armrest. Its frame is reinforced at the motor mounts and battery tray to carry the added weight. Because the motors drive the chair, its rear wheels are smaller and have no handrims.
Can wheelchair frames and parts be made to an OEM's own design?
Yes. Aluminum wheelchair frames, cross-braces, footrest hangers, and other welded parts can be manufactured to an OEM's drawings. Huang Wei supports OEM wheelchair programs with design and development support, material preparation, TIG welding, T4/T6 heat treatment, grinding, and finishing in-house, and has supplied a Canadian wheelchair brand since 2010. Samples are available for OEM projects; contact the sales team with a drawing to begin.
Looking for a reliable OEM manufacturer for aluminum wheelchair frames and parts? Huang Wei has manufactured wheelchair frames for a Canadian wheelchair brand since 2010, supplies aluminum bicycle frames to Giant and major European brands, and builds aluminum seat frames for Taiwan High Speed Rail (THSR) and the Puyuma Express — all backed by 30+ years of precision welding and ISO 9001 quality management. |