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@GA2G
Regarding whether any of the disc alarm locks might not be wide enough for a chainring - I think all disc locks designed for motorcycles would fit the width of any single chainring. Just from sight alone, the disc braking surface appears thicker than bicycle chainrings. Obviously these discs slow bikes down from 160mph or more, so must be thick enough to withstand those forces.
Double and triple chainrings will need closer attention to the gap width. But all single chainrings should be fine.
EDIT:
Fox has since let us know that the thickness of his Sugino 75 is causing a problem.
I'm providing a solution in a new post, plus in the Locks That Work thread.