I bought these to save money by changing tires for my dirt bike. 1-2 times a year I go to the sand dunes. Since I don't have an extra wheel, I have to swap the rear tire for a paddle and after a ride for a muddy one every time. All this in addition to my usual tire consumption. These tire changers cost less than a single tire change at my local shop; It's not a problem and I should have bought them a few years ago. For the mounts themselves; They held up well when I changed the rear tire yesterday. Didn't think I'd like the grips as I've used a lot of gripless mounts; but they held up well and gave me extra support when I wouldn't otherwise. 5 stars because they work and cost less than a single tire change. That pays off many times over.