The sequel brings back the three companions who figured in Three Men in a Boat, this time on a bicycle tour through the German Black Forest. The novel was written near the end of the Victorian-era bicycle craze, launched by the development of the two-wheeled safety bicycle. It depicts an era when bicycles had just become a familiar piece of middle-class recreational equipment. The references to brand competition, advertising, and enthusiasts' attitudes toward their equipment resonate with modern readers.