Not sure what your trying to do but if you let me know I might be able to help you with a solution!!!
RB5 uses the same 12mm hex as the ZX5 all round.
Hex thickness is 3.97mm from the front face to the boss on the back which butts to the bearing. The actual hex is approx 3.4mm thick. Centre hole is a 5mm clearence hole.
I hope that helps.
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