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That is true if you want to know how many thousandths it is out...if you can see run-out holding a pencil next to it...mounting a dial indicator is a waste of time
There is no way to know for sure if the rotor is out or the wheel is just moving around side to side from being spun. Its why a solid mounted dial indicator is necessary to determine rotor or wheel runout. Anything else is just a guess.
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