Got a Moots YBB in the shop that was recently retro-fitted by Moots for disc brakes, and now the rider has brought the bike in twice in the last three weeks to have the rear disc rotor trued. He's running XTR hydraulics with a 160mm rotor, and it's shimmed, but any other shims will make too much of a difference to help the problem. Wondering two things: anyone with a 26" YBB had nightmares dealing with retrofitted disc brakes? And could it possibly be frame flex causing the misalignment? Haven't ridden with the guy so I don't know his exact technique, but he's not racing downhill or anything, and generally the front rotor experiences the most abuse, not the rear. Thanks for your time and any help or experience.
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