I got these 20x8-8\" rear mower tires to replace my existing rear tires on my Troy-Bilt Horse riding mower. Upon arriving, the tires look well made. They came inflated, and the tread looks excellent. They are the exact same size tires that are on my tractor. As I removed one of my rear tires, then proceeded to put this one on, I noticed the hub on these wheels have a \"key notch\", whereas my exciting wheels have a \"flat spot\" in them. So, my axle has a flat spot on the end where the wheel hub only goes on one way in order to lock onto the axle so it will rotate when mowing. Since these tires did not have a flat spot in the wheel hub, there is nothing for them to lock onto the axle with, so I am unable to use them. I am rating them on the quality and build. But am disappointed I can't use them.