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  1. #1
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    'Old' XTR Disc - Larger rotors?

    Hi all, I have a set of Shimano M-965 XTR hydraulic discs, w/ metallic brake pads, 6" XT IS Rotors, connected to Mavic Crossmax SL wheels. I'd like to upgrade the front rotor to something a bit bigger, say 7". Is there an adapter kit to do this? Any potential worries w/ a larger rotor on the XC wheels? Thanks.
    Last edited by response3; 03-12-2007 at 12:29 PM.

  2. #2
    Nightriding rules SuperModerator
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    You can use the Hope +20mm Is to IS adapter for that purpose and an XT 180mm rotor. Shimano only makes a +40mm IS-to-IS adapter (to use with a 203mm rotor).

    If your front caliper is postmount, it is easier to find adapter for use with a 180mm rotor....

    regarding the wheels, I would only worry if your spokes are very light and if you go with a 203mm rotor... the 180mm would have no issue...

  3. #3
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    Did it!

    I just added the 180 rotor from the 160. It makes a huge difference on long downhills. Little or no fade is noticed. I have the 06 XTR brakes & cross max wheels but not the center lock rotors.
    I had my LBS order the adapter and the rotor, only took a few days to get. The installation was easy for them to do too.
    Let me know how it turns out for you but I love mine. I have only been on 4 rides, today will be the 5th. So far I love it.
    Oh and I have the cool max pads on my brakes.

  4. #4
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    Sweet. Thanks to both of you guys. BTW, Boxer, do you know the part #'s of the stuff the shop installed?

  5. #5
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    I dont have the part numbers here but i could see if I can get them for you.
    I will look tonight when I get home and if I dont find them I can call the shop to ask them for the part numbers.
    You want both the adapter and the rotor numbers a assume.

  6. #6
    Ultimated Outsider
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    Here you go
    The front IS adapter is SM-MA-F180S/S, but you can use a rear caliper in the front and it does the same thing
    The rear is SM-MA-R180S/S.
    The 180mm 6-bolt rotor is SM-RT75MA.
    You will also need to order the mounting bolts for the adapter because they dont come with them

  7. #7
    Nightriding rules SuperModerator
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    absolutely right sundowner..

    I had forgotten about those.. It had been posted in this thread some time ago

    new xtr calipers

    Here's an image of one of the adapters


  8. #8
    Hardtail Freak
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    I also have the BR-M965 (2005 XTR ) brakes and want to run a 7" rotor, but my fork is a post mount 2007 Manitou R7 and my front brake is I.S. mount. Is it possible to run this setup?
    2016 Norco Torrent 7.1
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  9. #9
    mtbr member
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    shimano makes it

    Quote Originally Posted by brodie_rider
    I also have the BR-M965 (2005 XTR ) brakes and want to run a 7" rotor, but my fork is a post mount 2007 Manitou R7 and my front brake is I.S. mount. Is it possible to run this setup?
    Shimano does make the adapter you are looking for. call your LBS and get them to talk to shimano regarding this.

  10. #10
    Hardtail Freak
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    Ok, can the part #'s for that mount be found on the Shimano website?
    2016 Norco Torrent 7.1
    2006 Santacruz VP-Free
    2000 Marin Indian Fire Trail
    Gone - 2001 Brodie Holeshot

  11. #11
    Nightriding rules SuperModerator
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    with PM fork to IS caliper...there are 2 adapter options made by shimano (none is 180mm)

    170mm: SM-MA-F170S/P
    http://www.chainreactioncycles.com/M...?ModelID=13744


    or 203mm SM-MA-F203S/P
    http://www.chainreactioncycles.com/M...?ModelID=13748

  12. #12
    Hardtail Freak
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    Thank you so much!
    2016 Norco Torrent 7.1
    2006 Santacruz VP-Free
    2000 Marin Indian Fire Trail
    Gone - 2001 Brodie Holeshot

  13. #13
    Nightriding rules SuperModerator
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    Hope does make a 180mm front IS to Post

    http://www.chainreactioncycles.com/M...?ModelID=13735

  14. #14
    Nightriding rules SuperModerator
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    Quote Originally Posted by brodie_rider
    Thank you so much!
    glad to help!

  15. #15
    Hardtail Freak
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    Just one question...Shimano's centerlock 7" rotor is 180mm, but that post mount to I.S. mount says 170mm...can you run them together?

    Edit: That Hope post to I.S. adapter is probably what I'm looking for if I want to run the '07 180mm xtr centerlock rotor.
    2016 Norco Torrent 7.1
    2006 Santacruz VP-Free
    2000 Marin Indian Fire Trail
    Gone - 2001 Brodie Holeshot

  16. #16
    Nightriding rules SuperModerator
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    Quote Originally Posted by brodie_rider
    Just one question...Shimano's centerlock 7" rotor is 180mm, but that post mount to I.S. mount says 170mm...can you run them together?
    No, sorry... for that adapter shimano makes an XT IS 170mm rotor...there is no 170mm in centerlock (as a separate note..shimano sells 180mm in both IS and centerlock)

    check the available XT IS rotor sizes here:
    http://www.chainreactioncycles.com/M...px?ModelID=756

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