I have waited to someone more knowledgeable than I to respond to the
question of how to adjust the bearing preload on the roto-flex hubs. I do
not have the special tool needed for the bearing preload adjustment. I
simply adjust the preload by tightening the nut on the axle stub until the
force to rotate the axle stub rotation effort seems too high (very
subjective). The same way I adjust front wheel bearings. I replace the
bearings in the hubs whenever I replace the couplings which is about every
2 to 3 years.
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