I usually use Vittoria tubes and have never had a problem with them, but for a change I switched to Continental. I have never had a tube blowout on me before but I've had two Continental tubes blow in about two weeks, one I controlled, the other I stacked. My tyres recommend I inflate them to between 115-145psi. I usually inflate to 120. But at 120 the Continental tubes blew out! I have a couple of spare Continental tubes and am just about to toss em, but before I do is this a problem specific to Continental or have I just had two bad eggs?