It is important to understand how this wheel attaches to your gate. An 8" wheel requires at least a 4" setback from the gate surface for the wheel to rotate 360 degrees. So your gate needs to be hanging fairly high off the ground for the wheel to complete a full rotation. Otherwise, you'll end up creating an extra 2" of clearance to make the wheel workable, since the wheel mount has a U-bracket 2" deep that attaches to the surface of the gate. Plan accordingly.