I had a customer who bought an early pair of carbon rim wheels. We stressed, and the brochures ALL said not to exceed 120 PSI.

Customer was a Triathalete (groan).

Came back a coupla days later and said he was scared going down a long descent. Said he heard a loud "Craaack" from the rear wheel. He was wondering if it was a warranty issue ?

I asked him what PSI he infated his 20mm tires to ?

As if it was a completely normal question, he told me : the rear is 220 PSI, the front is 200.

I could not believe my ears. Sheesh, Triathaletes . . .

So be a little cautious when really pumping things up to get tires to seat. It shouldn't take THAT much extra pressure to get the beads to seat.