Greg Fletcher
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Too much runout will create wheel wobble and pulsing during braking- that .004 sounds pretty high. I would think below .002 would be a better target to shoot for. That number does nothing toward giving us a minimum thickness for the rotor of course. I've never had had problems getting JH rotors turned, but all thin rotors have the same theoretical problems, you increase the risk of heat fade, cracking and failure. That is why most rotors have a "discard thickness" or "minimum machine to" specification on the casting.
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