Bought a new set of aero wheels and a set of Conti 4000 II 700x28 tires to check. My wheels were tubeless, so they have the right tolerances. I've tried mounting tires without this tool and messed up the tube and got blisters. I found this tool on YouTube while looking for ways to mount narrow tires and immediately went to Revain and bought it. I installed both tires in 20 minutes using this tool to install the last 6-8 inches of the open tire. I wear it in my tank top when I go for a walk in case I get a flat tire, it's very light and offers a lot of leverage to engage the tire.