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  1. #1
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    Drivetrain upgrade question

    Hey,

    I have a 2009 Specialized Stumpjumper Comp 29er HT (Bike details: https://www.bikepedia.com/QuickBike/...mper+Comp+29er) and I'm in the process of upgrading the drivetrain. I already bought the components, but as I get into doing the work I am now worried they might not be entirely compatible as i start to learn about boost standard. I am upgrading to the XT Deore M8000 2x11 cranks, shifters, front and rear derailleurs and 11-46T cassette, and am considering either the M8020 or M8120 wheel set (haven't bought wheels yet). The axle on my current rear wheel is 144mm (Sram X9 rear hub), whereas the new XT wheels are 148mm axles for the rear.

    So, my question is can I get away with a 148mm axle on my frame if I was to upgrade my wheels, and if not, will I have any issues running the M8000 2x11 group on a 144mm axle with alignment or shifting?

  2. #2
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    No you cannot, the frame wont except it.

    And never heard of 144mm rear spacing, odd one there.

    Regardless you have to get a proper rear hub for your frame, sorry for the bad news there.

    Sent from my SM-N975U using Tapatalk

  3. #3
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    Quote Originally Posted by tigris99 View Post
    No you cannot, the frame wont except it.

    And never heard of 144mm rear spacing, odd one there.

    Regardless you have to get a proper rear hub for your frame, sorry for the bad news there.

    Sent from my SM-N975U using Tapatalk
    But will the drivetrain work fine? I've already put in the new crank arms and bb (went off of Shimano's spacing guidelines). Any idea if I'll have alignment issues if the drivetrain is boost compatible?

  4. #4
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    Drivetrain upgrade question

    Does this look like your hub?


    https://www.worldwidecyclery.com/pro...disc-hub-black

    If so, your hub spacing is 135, not 144 as you posted. Your doing a 11 speed swap right? That may not fit, but a 10 speed cassette would.

  5. #5
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    The 11 speed cassette will fit his stock hub just fine.
    Change begins by doing something different.

  6. #6
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    Quote Originally Posted by NorCal_In_AZ View Post
    Does this look like your hub?


    https://www.worldwidecyclery.com/pro...disc-hub-black

    If so, your hub spacing is 135, not 144 as you posted. Your doing a 11 speed swap right? That may not fit, but a 10 speed cassette would.
    No, that's a different hub. After doing some searching, I finally found it listed online (discontinued hubs are not easy to find). This is it, which it turns out it's a 135mm spacing; I measured it wrong: https://www.bikeparts.com/BPC139664/...x135mm-32h-wht

  7. #7
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    Quote Originally Posted by takemebiking View Post
    No, that's a different hub. After doing some searching, I finally found it listed online (discontinued hubs are not easy to find). This is it, which it turns out it's a 135mm spacing; I measured it wrong: https://www.bikeparts.com/BPC139664/...x135mm-32h-wht
    Yeah, so just get a 135mm Quick Release wheel and you should be good. I assume your front will be 100mm Quick Release.

    With respect to "Boost", which crankset did you order? FC-M8000-2 or -2B? B is for Boost.
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    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

  8. #8
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    Quote Originally Posted by J_Westy View Post
    Yeah, so just get a 135mm Quick Release wheel and you should be good. I assume your front will be 100mm Quick Release.

    With respect to "Boost", which crankset did you order? FC-M8000-2 or -2B? B is for Boost.
    Luckily, I ordered the FC-M8000-2. So I assume since it's not classified as boost I shouldn't have any alignment issues? Also, I'm debating about a new wheel. I tried to press new bearings into my X9 hub, but the freehub body isn't really maintenance friendly and it's really difficult to get the bearing to sit in the freehub. It's either a new wheel or pay the shop to do the bearings since I'm not confident in my abilities as a new mechanic. Once I get that all figured out, I'll put the new cassette on and the derailleurs and get the whole thing rolling.

    It's kind of funny, once you decide to get into all of this and get excited and order parts, but then start the install you learn all sorts of things you weren't even aware of, like boost for example. And it's a little more complicated working on a 2009 bike to make sure you order the right parts!

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