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If it's only at 3/9 o'clock it likely won't be your hubs. Could be crank/bb spindle as mentioned above, possible that the bb needs some grease in the threads and cup/frame interface (if you aren't using press fit bb's), chainring bolts lose/dry, or even a slightly worn pedal bearing/bushing. I had a click on my mtb at roughly the same revolution which took me forever to diagnose and it turned out the pedal bearing was worn; new pedals cured the problem.
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