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  1. #1
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    SRAM X9 fatbike crankset

    I couldn't find any good info when I was shopping for this crankset so I figured I'd try to help someone else by posting some weights and photos.

    The crankset comes with a BB(121gr)


    The stock 36/22 spider and sprockets(165gr)


    Non drive arm(223gr)


    Drive side with hardware for stock spider(362gr)


    My 26t Wolftooth spider(53gr)


    Complete Wolftooth setup with spacers and BB(760gr)


    Gratuitous porn


    And some more...


    I got the crankset from Bikeman.com. I strongly suggest calling them directly for the "best price"

    Wolftooth I bought directly from their website.

    Hope that helps someone!

  2. #2
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    Thanks for posting this information.

    What's the real Q-factor?

  3. #3
    Missouri sucks...
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    Quote Originally Posted by quax View Post
    What's the real Q-factor?
    I don't know how to measure Q factor. Let me know how and I can do it for you I'd guess outside of crankarm to outside of crankarm at the pedal spindle area?

  4. #4
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    What is it replacing and what kind of bike? I'm looking at picking up the X5 to gain some more clearance to fit a BFL in the rear.

    Thanks for sharing.
    2014 Trek Fuel EX8
    2012 Salsa Mukluk 3
    http://tincup69.blogspot.com/

  5. #5
    Missouri sucks...
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    I don't have my frame yet. Still waiting on the builder to finish her up. There WILL be a build thread when I finally get it! This is my first fatbike but I will say that it's not designed for clownshoes and Lous. It's more of a trail bike. I'll be running MargeLites and probably some Sterlings. In other words, I don't know if these cranks will work on the fattest of the fat frames and tires out there.

  6. #6
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    Awesome, thanks. I've been getting ready to pull the trigger on exactly this setup. I was surprised to find so little about people running these cranks. To me the direct mount 26t seems like it will be a great 1x setup.

    What are you going to be running in the back? I've been thinking of a X0 9-speed grip shift shifting a Zee derailleur over and 11-34 cassette. Nice low-range for winter, lightweight, durable short-cage derailleur, cheap 9 speed chains.. sounds ideal to me.

  7. #7
    Missouri sucks...
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    I'll be running 10 speed with an X9 short cage, X9 trigger shifter, 11-36 XT cassette and XT chain.

  8. #8
    JYB
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    I've been running these X9 cranks on my Fatback for over 3 months. I really like them, except the BB appears to have sh!t the bed already. I'm tearing it apart tomorrow to see what's going on. There's tons of play - ie the crank arms "rock" back and forth. Definitely seems like blown bearings. This is the shortest lifespan I have ever had in a BB. Bummer.

  9. #9
    Missouri sucks...
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    I have the X0 crankset on my 29er and I've never had very good luck with the stock GXP BB. I upgraded to a Hope BB last year and have had much better luck. More expensive but reliability is a worth it to me

  10. #10
    JYB
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    Sounds like a good idea!

  11. #11
    Is this Eundro'ing?
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    thanks for the write up.

    I've been looking at the SRAM cranks because I like the direct mount chain rings.

    I just recently went to 1x10 on my Muk - Surly Whirlys, 30t raceface narrow/wide ring, raceface bash, 11-36 XT cassette, X9 trigger, X9 med cage type 2 rear mech.

    chain slap? gone.

    chain suck? gone.

    for snow crawling, I have the 22t mounted to the Whirlys... just lock the cage, swap the chain, and I still have enough range.

    ...looking forward to your build thread!

    BTW, love the Spikes - I have 2 sets. ;-)

  12. #12
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    Quote Originally Posted by DFYFZX View Post
    I don't know how to measure Q factor. Let me know how and I can do it for you I'd guess outside of crankarm to outside of crankarm at the pedal spindle area?
    Correct, outside to outside at the spindle. A SRAM spec chart mentioned 179.5 mm. I have a hard time believing this. Maybe SRAM-Qfactor is inside to inside?

    Thanks!

  13. #13
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    SRAM often quotes inner-to-inner for the sake of frame builders.

  14. #14
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    Quote Originally Posted by DFYFZX View Post
    I have the X0 crankset on my 29er and I've never had very good luck with the stock GXP BB. I upgraded to a Hope BB last year and have had much better luck. More expensive but reliability is a worth it to me
    Does Hope make a 100mm bottom bracket? I thought they only made 68/73 and 83.

  15. #15
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    The only thing that makes the X9 BB 100 mm wide is the center sleeve. It is otherwise like any other GXP BB.

  16. #16
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    Quote Originally Posted by kdiddy View Post
    SRAM often quotes inner-to-inner for the sake of frame builders.
    Probably, but still confusing. 2 x W4 at end of arm and Q-Factor at spindle? Those standards!

    SRAM X9 fatbike crankset-picture4_zps42d8e7b0.jpg

  17. #17
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    I appreciate the information provided above but have a couple remaining questions I'm hoping someone can help with.

    I'm considering the X9 fat bike crank with a spiderless 1x10 setup in mind. I've searched extensively but can anyone answer the following for certain:
    * What is the Q factor of this crank (outside of crank arms - not the inside measurement of 179.5mm that SRAM lists)?
    * Am I correct in thinking a single ring (spiderless configuration) would be positioned at 69.5mm (W3 position)?

    If a single ring is positioned at 69.5mm (from center of bottom bracket) this appears to be one of the widest available chain lines with the exception of offset designs, correct? For reference this is what I've found with other 1x crank setups:
    * Race Face Next SL: 68mm; 202mm q factor; 590g w/bb and 32t ring
    * Race Face Turbine: 66.5mm; 200mm q factor; approx 810g w/bb and 32t ring
    * Fatback Crank: 69.5mm, 215 q factor; 930g w/bb and 22t/32t/bash
    * SRAM X9: 69.5mm, ?? q factor; 760g w/bb and 26t ring

    Thanks in advance for any measurement help.

  18. #18
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    Each crank arm is 13mm thick at the pedal. Add 26mm to the quoted SRAM inside 179.5mm(which is accurate. I've measured it.) and you get 205.5mm outside Q.

    The bolt on chainrings can vary from manufacturer to manufacturer. Homebrewed's rings were flat so mounted essentially in the W3 spot. E13 and Wolftooth are offset inward and mount close to the W2 spot. Not aware any in the W1 spot. Don't see why there would be one. The W2 spot is by far the most popular as it would give better chainline for the majority of drivetrains. I doubt manufacturers are going to change much more than BB width on their fatbike cranksets. Possibly Surley, or another BIG endorser of fatbikes, might make a W3 chainring setup for fatties. Maybe they already do? I went with X9 because I have a pile of spiderless rings from my Banshee lying around. Purely cost conscious on my part.

  19. #19
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    Thanks DFYFZX for this information, it's exactly what I was looking for!

  20. #20
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    Another thing to add - i installed this crank with a 26t wolf tooth direct mount on my pugsley with rolling darryl/nate rear. Chainline is really good using the wolf tooth GXP version (offset) of the direct mount ring. Tire clearance is good as well.

    before i installed the single ring - i left the stock spider on and found i had plenty of tire clearance in the 22f/36r low gear combo.

  21. #21
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    Also of note: If you go with the non-offset (BB30) chainring from NSB, the chainline goes out to about 71mm. Perfect for a 1x on bikes spaced for 190mm rears or the Moonlander IF the crank arms don't hit the frame. That's a big if. I'm looking at a custom frame that uses this setup so I can maintain a sane Q factor but still get around a Lou on a Clown Shoe. It will be tight for sure. Here's a pic with the "BB30" version of the NSB 26t chainring installed:

    SRAM X9 fatbike crankset-sramx9.jpg

  22. #22
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    In case you missed it, here is some really good chainline info.
    Tech Speak: Decoding Fatbike Hub Spacing and Drivetrain Compatibility with Wolf Tooth Components

    As far as the X9 crankset goes, get a GXP ring (middle position) for 170mm rear hub or a BB30 (essentially big ring position) for 190mm rear hubs.
    =========================================
    Minnesota Off Road Cyclists www.morcmtb.org

  23. #23
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    I have this crank on a Beargrease carbon and the chainline is very close to the small ring position with the Wolf tooth GXP 28t. Straight chain in 4th & 5th and a full finger width chain clearance in lowest gear. I hope the chainline remains this way when I get a Next SL crank as they offer spacers to shim and the chainring can be flipped to move it out a little more. This is a nice crank and if it was a 170 I would keep it.

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