There's no fixed measurement for a beach wheelchair. It buzzes down to the disabled individual special needs and size. Like everything else, beach wheelchairs are flexible. The general rule of thumb is to design the wheelchair around 24 inches in external width, 20 inches in internal width, 38 inches, height push bar level, and 31.5 inches outside wheels external width. In all, a beach wheelchair frame and setting should provide comfort to the disabled person.