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You want to know what size it is. Measure it with a caliper and you'll know. What point did I massively miss? I've never touched the rear hub nut and apparently not too many others have either based on the number of replies. That leaves two options unless I'm wrong: measure it [with calipers] or Google it. If you search correctly, I'll bet ya the answer is in one of the first three results.
Hub arrived today..yea.
From what I can see...they use ball bearings instead of rollers...no wonder they wear out quickly.
I have torque wrench at the ready....160lb's..."check"