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I have an ancient/first-gen Psychlo-X YBB disc (130mm spacing, QRs, discs (mechanical routing) and canti studs—yes, that ancient), and I am able to fit 650B x 38mm tires, but not 42mm tires. So clearance is pretty tight but rideable. I would think that if my frame can accommodate those tires, more recent Psychlo-X frames should be able to, too. However, as ipsy notes, it’s a data set of one (well, now two).
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