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  1. #1
    It's Makeable
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    Mar 2008
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    59

    Which 180mm SM-RT75MA 6 Bolt?

    Braking Wizards:

    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

    Thanks.

  2. #2
    Nightriding rules SuperModerator
    Reputation: crisillo's Avatar
    Join Date
    Jul 2004
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    20,759
    the shimano part number is actually SM-RT75MA, the other number is probably a distributor part number or just a mix up

  3. #3
    It's Makeable
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    Mar 2008
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    Time to order. Thanks!

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