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  1. #1
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    No option for XTR IS caliper to PM fork?

    I'm buying some XTR m975 brakes but the front comes as IS. I have a PM fork.

    Apparently there was an option when buying these that you could get either the IS or PM caliper.

    I can't seem to find the adapter to go from IS caliper to PM fork, 160mm rotor. I can find an adapter to go the other way.

    So confused.

  2. #2
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    http://techdocs.shimano.com/media/te...9830609100.pdf

    Looks like the adapter only exists for 180 and 203mm rotors

  3. #3
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    Ok, after exhausting google searches, there's no such adapter made by Shimano. Typically if you have to go to a PM fork, you have to go up in rotor sizes.

    However, I found this!

    http://cgi.ebay.com/Brake-Adapter-Po...item4aa3074d9a

    Someone smart please chime in here

  4. #4
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    no shimano adaptor but the one posted looks like it would work. of course you could get a 180 rotor for less money

  5. #5
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by banksd1983
    Ok, after exhausting google searches, there's no such adapter made by Shimano. Typically if you have to go to a PM fork, you have to go up in rotor sizes.

    However, I found this!

    http://cgi.ebay.com/Brake-Adapter-Po...item4aa3074d9a

    Someone smart please chime in here
    If you have a Manitou fork it will not fit. The lower "post" is much shorter and there in no clearance for that adaptor.
    mtbtires.com
    The trouble with common sense is it is no longer common

  6. #6
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    Reba SL, but I just don't see myself paying $50+ for an adapter, when i could find a new caliper for not much more

    thanks, i just don't see why shimano didn't make that adapter

  7. #7
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    They didn't make one because of what Shiggy said. In addition to Manitou, other forks might not fit.

  8. #8
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by the-one1
    They didn't make one because of what Shiggy said. In addition to Manitou, other forks might not fit.
    And they no longer make an IS-only caliper so this is not an issue in the future (the better solution). I would get the new caliper.
    mtbtires.com
    The trouble with common sense is it is no longer common

  9. #9
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    To use the IS caliper on PM forks you would need at a minimum a 170mm rotor. Shimano made adaptors and rotors some time ago and they can still be found, but as you suggest, probably easier just to get a new caliper.

    Tim

  10. #10
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    thanks, I'm glad i didn't pull the trigger on the xtr's quite yet

    i guess i'll keep looking for something light/xc

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