I only got it a few days ago so I can't say for how long. 3 wheels stood up without removing the plastic cap. The latter had to be removed due to an uneven cut in the plastic. In fact, it was very difficult to take my hat off. Otherwise it's good. I'm fat, so if he's holding me, that's good. The last one blew out like a tire going 90 on the interstate. Hope these are the last.