[fcatwo]

I wonder how much pressure it would take to actually cause a problem and what the problem might be. I know people who pump paper-thin racing bicycle tires up to 140lbs in the morning and ride them all day without giving it another thought. I suspect Lance does that.

I've also seen tires (and tubes) that failed from their riders keeping their rim brakes on for extended periods while descending mountains on tandem bicycles - one was in our group and was about 10 min ahead of us in Switzerland last summer. It appeard to have been near the melting point when it failed. The plastic strip that covers the inside bottom of the rim had melted to the point that the spoke ends were showing.