Struts are 5/8" diameter. Landing gear body has special modification to accommodate wing installation. 1/5 scale upper main mechanisms with 5/8" diameter oleo struts. Axles installed at angle specified by manufacture and comes with a complete large air system included! See part number 1400 for large air system description. For realistic retraction and extension gear speed, look at our Deluxe 4 Way Valve. Order 1410E when ordering the gear and save $$$$.