A bicycle tow device that attaches to a bicycle to allow the bicycle to tow one or more other bicycles or carry one or more bicycle tires. In some versions the tow device can be installed on the towing bicycle without tools and a towed bicycle can be attached to the tow device without tools. One version of the tow device includes an adjustable support to adjust the tow device so that bicycles of varying frame and tire sizes may be towed. The tow device may also include a skirt within a guide to gently secure the towed bicycle to the tow device.