The wheel is a ring, usually driven by smaller wheels pressing against its inner rim. The wooden wheels were protected with an iron rim (tire) typically about wide. Nevis Peak is located on the outer crater rim. The altitude difference between the rim and the bottom is over . A design with a scalloped outer rim and six nail holes was common. The total area within the outer rim of the reef is . Spaced about the rim of the chamber are cylindrical cavities. This is especially true of the outer rim. A standard steel rim spare was used. Rendezvous at the North Rim of the Grand Canyon. It primarily served patrol duties in the Outer Rim. Sixteen peaks exceeding line the caldera rim surrounding Heaven Lake. The Skywalk is about by road from Grand Canyon Village at the South Rim. She was among those given the duty of protecting the Solar System's Outer Rim. This greater age is in line with the degree of erosion of the crater rim.