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  1. #1
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    6 bolt disc rotor for Shimano M485 disc brake system

    Hi. I have the Shimano M485 disc system on my Trek 6500. The rotors I have are 160 mm centerlock SM-RT53 but I just purchased a DT Swiss wheelset with a 6 bolt attachment. I've been looking for rotors that will fit. I've found SM-RT75 and SM-RT51 on Ebay but I want to be 100% sure that they will fit before I buy them. What is the difference between the two types? Thanks

  2. #2
    Nightriding rules SuperModerator
    Reputation: crisillo's Avatar
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    also look at the new SM-RT76

  3. #3
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    SM-RT75 is the XT level rotor
    SM-RT51 is a cheaper, heavier version
    they are interchangeable in terms of dimensions

    I have been using these rotors for a while with my Shimano LX brakes

  4. #4
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    Just did the same thing on my girl friends bike, new wheels and needed the 6 bolt rotors for her M485's and these where the best price I found from someone who ships fast

    http://www.jensonusa.com/store/produ...olt+Rotor.aspx


    Quote Originally Posted by photoman
    Hi. I have the Shimano M485 disc system on my Trek 6500. The rotors I have are 160 mm centerlock SM-RT53 but I just purchased a DT Swiss wheelset with a 6 bolt attachment. I've been looking for rotors that will fit. I've found SM-RT75 and SM-RT51 on Ebay but I want to be 100% sure that they will fit before I buy them. What is the difference between the two types? Thanks

  5. #5
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    fyi: research on whether i can replace my sm-rt51 rotors with sm-rt75 rotors ... this post implies i can and this post implies that i cannot ...

  6. #6
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    I have M485's and bought a 180mm rt-75 rotor thinking it would be fine. Nope. The brake track is thinner than the pads on the M485's.

    I'd assume the it's the same with the 160mm rotors.
    I'm looking forward to regretting this.......

  7. #7
    Vaginatarian
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    Quote Originally Posted by boomn
    SM-RT75 is the XT level rotor
    SM-RT51 is a cheaper, heavier version
    they are interchangeable in terms of dimensions

    I have been using these rotors for a while with my Shimano LX brakes
    not quite
    heres a chart that shows the RT51 as the wide type and the RT75 as the narrow, could work with the right adaptor, but I've run into issues with the brake pads being 1/16" higher than the rotor, so not full contact
    Attached Thumbnails Attached Thumbnails 6 bolt disc rotor for Shimano M485 disc brake system-shimano0001.jpg  


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