Tricycles are available in a wide variety of adult and child size models with many different seat, frame and gear options. For persons with balance problems, “trikes” are stable alternatives to bicycles. A variety of trike designs can be found on web sites such as those hosted by companies such as Trailmate (www.trailmate.com), Rock n Roll (www.rocknrollcycles.com)  and Worksman (www.worksman.com).