My road tires state 8.5 BAR - I run at around 7.75BAR. I have had two "explosions" of the inner-tubes at higher pressures. One was when I was trying to hit the 8.5 target and the tube blew out like a gunshot next to my ear (I was pumping the tire at the time) - my ear rang for hours afterwards. The second incident was when I was riding uphill and again, the tube exploded and actually blew out the side of the tire. Im a little paranoid on tire pressures now