Definitely 57psi-- and most odd of all, they had about 300 miles on them when the rear detonated. You can see the bike white splotch of sealant on the spot where the tire blew out, I could fit my index finger into the hole. Was a bit like a pistol report when it went-- smooth pavement, moving around 20mph. I stayed upright, but the weight of me and the bike cut right through the thin sidewalls and wrecked the hoop.
Certainly not carbon. I'm still not to the point where I trust carbon as a wheel material where I live, which when combined with the fact that carbon are wicked expensive leaves me on alloy. I'm running wheels built up with Kinlin XR31T hoops, and they're great. Also luckily fairly cheap, it was only a hair over $100 to get the hoop and have the wheel rebuilt.
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