I am swapping out a rear 160 mm rotor for a 180mm and came up with two choices. That's twice as many as I can process in any one day. Is there a difference b/w the ISMRT75MA and the USMRT75MA?
A certain online store lists the same part with two different Shimano part nos.
212-51066 180mm SM-RT75MA 6 Bolt - Mfg#: ISMRT75MA (SAC)
212-56653 180mm SM-RT75MA 6 bolt - Mfg#: USMRT75MA
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Thread: Which 180mm SM-RT75MA 6 Bolt?