Just like these mini tires for removing difficult bike tires, they make it easy to remove tires from a tractor. Simply deflate, remove the valve, place an iron between the rim and tire, add another iron and start prying. After both pearls are "broken". Using a dowel or large screwdriver in the rim axle hole creates a pivot point to rotate the tire off the rim. With them, fitting new tires is much easier. Two wheels removed, rims cleaned, tires changed and reassembled in about an hour, including