Eagle chainline issue on Farley- Mtbr.com
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  1. #1
    mtbr member
    Join Date
    Aug 2019

    Eagle chainline issue on Farley

    Hey folks, here's the scoop:

    Frame: 2020 Farley so 121 BB shell and 197 rear spacing.
    BB: Pressfit DUB 121
    Crank: SRAM FAT5
    Spacers: 2mm outer non drive, 6mm outer drive side per SRAM
    Cassette: GX Eagle normal 12speed
    Rear Derailleur: GX Eagle
    B Screw: Set with red tool just to avoid that being an issue.

    Chainline seems way off. Looks to be dead straight on the smallest cog, so by the time I get up to the two largest I have way to much chain angle. enough where a couple pedal rotations actually pulls the chain off the chainring. Shifts well in all other gears though.

    What am I missing?

  2. #2
    fat guy on a little bike
    Join Date
    Dec 2006
    er... i thought the farley had the fat4 crank? All my friends bikes do, rigid or full squish... maybe that is your problem?
    2016 Surly Wednesday
    2017 Lenz Fatillac
    2019 Lenz Fatillac

  3. #3
    mtbr member
    Join Date
    Aug 2019
    Rigid. Trek shows FAT 5 on the website and in their tech docs.
    Attached Thumbnails Attached Thumbnails Eagle chainline issue on Farley-farley.png  

  4. #4
    Reputation: Flying_Scotsman's Avatar
    Join Date
    Jul 2011
    What off set do you have on your chainring?? -4mm should be the fat5...

    I am pretty sure the Fat4 and 5 and the same cranks but different chainrings... if you order the +6mm you will gain the 10mm needed to correct your chainline.


  5. #5
    mtbr member
    Reputation: CanuckMountainMan's Avatar
    Join Date
    Oct 2018
    Both my new 2020 Farley's (7 and 9.6)
    have a pretty extreme angle on the hanger on the Big 50

    (SRAM 11-50t NX Eagle with 30t Fat 5 Crank)

    When on the next gear down (42?) it almost looks normal.

    I wonder if Trek kept the same chain length when they went from 11-42
    My 2018 Farley 7 with SRAM 11-42 cassette and 28t Race Face crank never had a problem.

    The derailleur arm angle on the new Eagle NX looks much better just one gear down from the 50 (42?)

    I haven't had any shifting issues.... yet.
    Attached Thumbnails Attached Thumbnails Eagle chainline issue on Farley-50v42.jpg  

    Eagle chainline issue on Farley-eagle-11-50.jpg  

    2020 Farley 9.6 Matte Olive
    2020 Farley 7 ROARange
    2018 Farley 7 Viper Red

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