Review on 🔧 Shepherd Hardware 9798 Pneumatic Spring Loaded: Enhanced Quality and Performance by Greg Mahoney

If you have a good sized gate over 7 feet or so and the ground surface isn't smooth concrete, don't even think about getting a smaller 4 inch version of this gate wheel. I did this first because I really didn't want the air wheel to have to worry about not rolling. I have a gravel surface and a 7" wooden gate, the 4" wheel just plowed through the rocks and wouldn't spin. This 8 inch works great. You need to play with the mount to make sure the wheel isn't rubbing on the gate and that you have the correct spring pressure. When done right, it works wonderfully. Air retention problems so far (approx. 6 months)