i have .... well not a lower face and not a mon it was me lol the tire was cracked and old the side wal split at 40 lbs and it bulged so fast i didnt even have time to think and then BOOOOOOOOOOOMMMMM !!!!! it exploded so damn loud it sounded like a pipe bomb no kidding ! people were looking out windows ! so yeh even a bike tire can explode and send a piece of 4 in wide rubber into your forehead ! it feels like getting punched by mike tyson ! that was only 40 lbs of iar in a wal mart bike tire. but then i have hookworms that hold 60 on the regular and could probably take a good 70 so ..... be carfull the quality of tire definatly matters !