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.

i wonder if a "fellow Triathlete" didn't give him that pressure advice...
i once had a prominent kart shop owner walk into my pit and advise me to up my tire pressures to 25+ lbs. and "it will make my kart faster".. I regularly ran 15.5 lbs rear, 15 front, on my kart. This was determined after MY chosen shop's owner told me what he runs, and after i did two days of testing.
i kept beating the "pit advice" offerer, race after race. The same day as "the Advice", he tried to cause me to spin out repeatedly by short braking, so i , somehow, failed to brake and avoid rear ending his kart on the 4th lap... he spun off turn 6 (now. was 7) into the infield, right across a Fresh COW PIE... the floorboard of his kart skimmed the top off that pie, and directed it all over him and his pride and joy kart.
Phil never gave me "advice" after that.

Somebody else posted up somewhere on BF with a Schwalbe tire issue (a failure to be specific, tire separated from the bead) and it reminded me that my brother has been having to warranty more Schwalbe tires at the shop in the last few years. These are tires that he took out of the box and either noticed a defect before installing or installed the tire and noticed a defect immediately afterwards. We're both big Schwalbe fans, still get them often but we look at bit closer at their tires these days when they come in.

My brother has one at the shop and amusingly refers to them as hotdog pliers.
One of these days, we're going to actually cook hotdogs with them over a campfire.

I just went through a difficult tire-rim fit, where the tire wouldn't fully climb the rim. The tire was Continental, and the particular rim caused trouble with other tires, too. In the past, I might have improved the seating, but the hiccups in riding still remained. This time, I had a couple of days before the bike's first use with that tire, so I pushed through to a full solution. With this, I can report how different methods to cope with the challenge worked.

Improving the tire's seating by hand while gradually pumping did nothing. Using tire levers or the tire seater I suggested, on their own, allowed the poor seating to spread a bit, reducing hiccups in riding, but did not eliminate them. High pressure and pouring talc between the bead and rim did nothing on their own. What finally worked was generously spreading soapy water with a brush between the tire and rim. At high pressure, the tire climbed the rim with a pop, distributing itself very evenly.