FreeWheel Rack - With your FreeWheel on, the RACK installs in seconds and uses the design of the FreeWheel to allow you to easily carry groceries, luggage, or just about anything up to 25 lbs. with ease. Rack size is 20" x 15". Made from lightweight, sturdy, black aluminum. Weights app. 1 lb. Please measure the width of the vertical frame tubes on your chair, at the height of 11" from the ground. If the width is OVER 13-3/4" center-to-center, please indicate on your order.