Abstract: Disclosed commuter vehicles include a chassis that includes a frame, opposed first and second steerable front wheels, a trailing rear wheel, and a linear-input steering mechanism for controlling an orientation of the first and second steerable front wheels. The commuter vehicles also include a drive-train for transmitting rotational motion and torque from a power-input source to rotational motion of the trailing rear wheel, and a body defining a cockpit and being supported by the chassis. An outer-most lateral dimension of the body corresponds to a maximum outer-most lateral dimension of the commuter vehicle. Embodiments of linear-input steering mechanisms compatible with commuter vehicles being so dimensioned as to fit through an open door are described.