Abstract: A manually-propelled wheelchair having a frame having a forward-facing seat, two independently castered front wheels mounted to the frame, a rear axle suspended beneath the frame, and two rear driving wheels, each rotatably mounted upon an opposite end of the axle. Rotatably mounted upon opposite ends of the axle are two lever arm assemblies, each comprised of a discrete lever arm ending in a handle and extending far enough from the axle to allow an occupant of the seat to grip the handle. A discrete one-way clutch connects the lever arm to the wheel mounted upon the same end of the axle. The one-way clutches may be disconnected by the occupant by operating twist grip handles mounted upon the lever arms. Occupant-operable disk brakes are provided for each driving wheel, a rotor of each disk brake connected to a driving wheel so as to rotate with the driving wheel and a caliper of the disk brake mounted upon a corresponding lever arm.