There are several tires/treads for sale. Most of them have hooks to attach them behind the tire to keep them from falling off the tire. I spent a bit more money not to kneel and lean against the hoop to connect the hooks behind the hoop. So glad I did. These covers fit over the tires and feel firm and non-slip enough to prevent them from being blown off. They also have enough material to protect the lower front and bottom of the tire tread from the sun. As for durability, time will tell. They appear to be heavy material to make me believe they will last a while. I'm happy so far.
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