The struts and wheels dictate the height of the wheelchair. The patient’s weight will tell you what size wheels are needed, and the rear leg height will help to determine the proper strut size. The struts adjust in half inch increments with push buttons that secure them to the leg of the frame. The tire and strut set ships as a pair with each of them pre-assembled.
Air tires are recommended over foam tires for very active dogs over 50 pounds. They also offer bounce and better traction for off-road use.