I also have a problem with someone jumping on someone what tire pressure, or you must be overloaded. By now we should all know the China tires do not hold up. Sure we may be overloaded, and should try to correct that problem, and of course watch tire pressure. Also good to know our total weight. When I buy a new unit one of my first projects is to buy a quality tire that I know will hold up. I've only lost one tire, and it was caught going through a town before it could throw the tread. I'm still thankful for the guy that waved me down. One good tire as well as others is Maxxis.