A bicycle convertible from a bicycle mode to a stroller mode comprises a frame having a front portion supporting a carrier and a rear portion. A front wheel supports the front portion of the frame, and a rear wheel supporting the rear portion of the frame in the bicycle mode. The rear portion of the frame is hinged to the front portion of the frame such that to convert the bicycle from the bicycle mode to the stroller mode the rear portion of the frame can be moved alongside the front portion of the frame to position the rear wheel to support a one side of the rear portion of the carrier. An auxiliary wheel, movable between a raised position raised from a riding surface in the bicycle mode can be moved to a lowered position contacting the riding surface in the stroller mode to supports the other side of the carrier.