The tie rods set the toe of the tractor, ie the front wheels pointed inward (toe in) or outward (toe out). If you are thinking of the tilt of the wheels, (from top to bottom) that is camber, but I don't believe it is adjustable. I think there is a sleeve in the axle casting that may be a wearing part, but I'm not 100% on that so we'll need to wait for someone more familiar to respond.