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A wheelchair (100) includes a chassis (101) defining a seat (102), a backrest (103), one or more armrests (104,105), and an undercarriage (106). One or more front caster wheels (118,119) are coupled to, and selectively detachable from, the undercarriage. One or more rear wheel assemblies (120,121) e

A wheelchair (100) includes a chassis (101) defining a seat (102), a backrest (103), one or more armrests (104,105), and an undercarriage (106). One or more front caster wheels (118,119) are coupled to, and selectively detachable from, the undercarriage. One or more rear wheel assemblies (120,121) each include a rear wheel (125), an axle (127), and a mounting post (129) extending distally from the axle at a substantially orthogonal angle relative to the axle. One or more quick release devices (130,131) couple each mounting post of each rear wheel assembly to the undercarriage such that the each the one or more rear wheel assemblies is selectively detachable from the undercarriage.

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1. A wheelchair, comprising: a chassis defining a seat, a backrest, one or more armrests, and an undercarriage;one or more front caster wheels coupled to, and selectively detachable from, the undercarriage;one or more rear wheel assemblies, each rear wheel assembly comprising a rear wheel, an axle,

1. A wheelchair, comprising: a chassis defining a seat, a backrest, one or more armrests, and an undercarriage;one or more front caster wheels coupled to, and selectively detachable from, the undercarriage;one or more rear wheel assemblies, each rear wheel assembly comprising a rear wheel, an axle, and a mounting post extending distally from the axle at a substantially orthogonal angle relative to the axle; andone or more quick release devices;each mounting post of each rear wheel assembly coupled to the undercarriage by a respective one of the one or more quick release devices such that each the one or more rear wheel assemblies is selectively detachable from the undercarriage; andthe one or more quick release devices each comprising a clamp and one or more threaded retention devices to couple a first end of the clamp to the undercarriage and a second end of the clamp to the mounting post;the one or more threaded retention devices comprising at least a first threaded retention device to couple the first end of the clamp to the undercarriage and a second threaded retention device to couple the second end of the clamp to the mounting post. 2. The wheelchair of claim 1, the clamp comprising an extended figure eight clamp. 3. The wheelchair of claim 1, each of the one or more quick release devices to couple to the undercarriage in an orientation that is substantially parallel with the one or more armrests. 4. The wheelchair of claim 1, the one or more quick release devices to offset the mounting post from a plane defined by the backrest by at least one inch. 5. The wheelchair of claim 4, the one or more quick release devices to offset the mounting post from the plane by about two inches. 6. The wheelchair of claim 1, the second threaded retention device comprising a handle to enable tool-less rotation of the second threaded retention device to couple the second end of the clamp to the mounting post. 7. The wheelchair of claim 6, the one or more threaded retention devices further comprising a third threaded retention device to couple the first end of the clamp to the undercarriage. 8. The wheelchair of claim 1, wherein when the one or more front caster wheels and the one or more rear wheel assemblies are detached from the undercarriage, the backrest and the one or more armrests are foldable atop the seat and the undercarriage is foldable beneath the seat to form a folded chassis. 9. The wheelchair of claim 8, the folded chassis having a length less than twenty-four inches, a width less than twenty-two inches, and a height less than ten inches. 10. The wheelchair of claim 9, the length less than about twenty-three inches, the width less than about twenty-one inches, and the height less than about nine inches. 11. The wheelchair of claim 1, the one or more rear wheel assemblies each comprising a brake assembly coupled only to the mounting post, the brake assembly comprising a handle to pivot to selectively apply stopping friction to the rear wheel. 12. The wheelchair of claim 1, the chassis defined by one or more chassis tubes, at least one chassis tube telescoping. 13. A wheelchair, comprising: a chassis defining a seat, a backrest, one or more arm rests, and an undercarriage, the chassis defining a first major dimension that is substantially parallel to a plane defined by the seat and a second major dimension that is substantially orthogonal to the plane; andtwo rear wheel assemblies, each rear wheel assembly comprising a mounting post extending distally from an axle; andtwo quick release devices, each quick release device comprising an extended figure eight clamp to couple each mounting post to the undercarriage such that the each rear wheel assemblies is selectively detachable from the undercarriage to reduce the first major dimension and the second major dimension;wherein the each quick release device, when coupled to the undercarriage, is configured to offset the each mounting post from another plane defined by the backrest to extend the first major dimension by at least one inch. 14. The wheelchair of claim 13, wherein when the two rear wheel assemblies are detached from the chassis, the chassis is foldable to form a folded chassis having a length less than twenty-four inches, a width less than twenty-two inches, and a height less than ten inches. 15. The wheelchair of claim 14, the each quick release device further comprising one or more threaded retention devices to couple a first end of the extended figure eight clamp to the undercarriage and a second end of the figure eight clamp to the mounting post. 16. The wheelchair of claim 15, at least one threaded retention device comprising a handle to enable tool-less rotation of the threaded retention device to couple the second end of the figure eight clamp to the mounting post. 17. The wheelchair of claim 16, the each rear wheel assembly comprising a brake assembly coupled to the mounting post, the brake assembly comprising another handle to pivot to selectively apply stopping friction to a rear wheel.