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the bolts close but the ring is still lose
Fibrelyte do shims to solve this, apparently the Rotor rings are abnormally thick and their bolts are sized to suit. Some aluminium spacers (probably the 0.6mm ones) would do just as well.
tried to install absolute black narrow wide ring on rotor 3D plus crankset with rotor bolts .. the bolts close but the ring is still lose, do I need spacers or longer chainring bolts or something? cc/ @andyp