The wear does extend down the arms past the rotors by a couple of mm.
This partially backs up the theory, but I can't find anything definitive.
I’ve ran bb5/7s with all sorts of rotors including centrelock Shimano and haven’t noticed any effect on brake performance.
I’d say wear down the arms a bit is better than adapter faff anyway.
@M_V started
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The wear does extend down the arms past the rotors by a couple of mm.
This partially backs up the theory, but I can't find anything definitive.