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Thread: XT M8000 1X 165mm boost cranks

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    Senior Member EsPeGe's Avatar
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    Default XT M8000 1X 165mm boost cranks

    Hey all hope everyone has saddle sores from all the riding. Anyway I've just scored a new Pivot Mach 429 Trail which runs boost cranks. Unfortunately the cranks on it are 170mm and I run 165mm. I can't find any XT M8000 boost cranks in 165mm only 170 and up. The shimano website doesn't even mention the boost standard for XT which is frustrating. Does anyone out there know if they make these cranks in 165mm or gave any decent info on them?

    Cheers Scott.


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    Senior Member JTmofo's Avatar
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    Hey mate, part number you are looking for for boost 1x XT cranks is

    FC-M8000 B1

    Looks like 170mm is the shortest in boost that they make.

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    Senior Member EsPeGe's Avatar
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    Quote Originally Posted by JTmofo View Post
    Hey mate, part number you are looking for for boost 1x XT cranks is

    FC-M8000 B1

    Looks like 170mm is the shortest in boost that they make.

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    Cheers mate. Pretty much what I found. Very frustrating if that's the case. Apparently short people don't ride bikes with boost. I'll keep searching but I'm not feeling positive.


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    Senior Member JTmofo's Avatar
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    Quote Originally Posted by EsPeGe View Post
    Cheers mate. Pretty much what I found. Very frustrating if that's the case. Apparently short people don't ride bikes with boost. I'll keep searching but I'm not feeling positive.


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    I've go a set of M9000 1x in 170mm (that's my short Arse requirement) on my hardtail. I've also got some raceface cinch (Turbine) on my dually.

    Great thing about raceface direct mount stuff is that the cranks remain the same, so there's no boost specific crank. The direct mount ring denotes the chain line, so you can change the cranks from boost to non boost by changing the ring only.

    I like that.

    Just checked, and you can get Atlas (30mm spindle) aswell as Next and Sixc in 165mm.

    You'll need new bb tho.

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    Senior Member EsPeGe's Avatar
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    Quote Originally Posted by JTmofo View Post
    I've go a set of M9000 1x in 170mm (that's my short Arse requirement) on my hardtail. I've also got some raceface cinch (Turbine) on my dually.

    Great thing about raceface direct mount stuff is that the cranks remain the same, so there's no boost specific crank. The direct mount ring denotes the chain line, so you can change the cranks from boost to non boost by changing the ring only.

    I like that.

    Just checked, and you can get Atlas (30mm spindle) aswell as Next and Sixc in 165mm.

    You'll need new bb tho.
    Yeah not really sure what I'm gonna do. Even though it's only 5mm 165's do feel more comfortable for me so I would prefer to stick with them. Will have a look at the set up you are talking about if I can't find any XT/XTR's.


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    You could go with the previous series XT 165mm cranks and mount the ring on the outside (big ring position). Just make sure you get the 3x version and not the 2x version.
    Wanted: broken 10 speed XTR rear derailleur

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    Isn't flammable. moorey's Avatar
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    170mm with thick pedals. You're welcome.

    Fuck clipless, if that's the case.
    Quote Originally Posted by JTmofo View Post
    Think I'll just buy an Orange!

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    Senior Member JTmofo's Avatar
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    Quote Originally Posted by moorey View Post
    170mm with thick pedals. You're welcome.

    Fuck clipless, if that's the case.
    Or get yourself a pair of these? (Vegan friendly?)

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    Senior Member Mr Crudley's Avatar
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    Quote Originally Posted by JTmofo View Post
    Or get yourself a pair of these? (Vegan friendly?)
    Those shoes are made for disco.



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    Senior Member EsPeGe's Avatar
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    Quote Originally Posted by SummitFever View Post
    You could go with the previous series XT 165mm cranks and mount the ring on the outside (big ring position). Just make sure you get the 3x version and not the 2x version.
    Might be an option but I've done a heap of reading and it would seem that I may be able to use the standard M8000 cranks and the chainline shouldn't be adversely affected. The only thing I need to keep an eye on would be the size of the front ring which seems to be the limiting factor. It looks like the biggest ring I can run up front is 34T which will be fine although on some occasions I would prefer a 36T.

    Cheers Scott.

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