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  1. #1
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    how's my chainline?

    I don't have access to a micromter, but here is my setup: xt 2x crank, chris king threaded 73mm bb, 2.5 spacer moved from drive side to non-drive side, xt m8000 11x42 cassette. Absolute black 32t oval with built in 2mm spacer, 104 bcd. When chain is straight it's on the 6th cog (smack dab in the middle) of the rear cassette.how's my chainline?-chainline1.jpghow's my chainline?-chainline2.jpg

  2. #2
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    I am interested in the answers to come. I have a very similar setup but something's not right with mine.

  3. #3
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    XT 2X crank setup 1X with 2mm built in spacers ~50mm
    Moving the 2.5mm BB spacer gets you to ~47.5mm

  4. #4
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    Quote Originally Posted by OneUp View Post
    XT 2X crank setup 1X with 2mm built in spacers ~50mm
    Moving the 2.5mm BB spacer gets you to ~47.5mm
    Ok.Where do the 50-47.5 dimensions come from? Sorry for my ignorance I am really trying to learn how to do stuff so I don't have to fork out my money to a bike shop.

  5. #5
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    Quote Originally Posted by sbvx67 View Post
    Ok.Where do the 50-47.5 dimensions come from? Sorry for my ignorance I am really trying to learn how to do stuff so I don't have to fork out my money to a bike shop.
    The OP bike has an XT 2X crank.

    - The 2X chainline would be ~49mm (average of the chainlines of the two rings)
    - It you mount a flat narrow-wide ring to that crank you get ~52mm (because it mounts in 104mm position)
    - The ring mentioned has 2mm built in spacers to allow it to fit a 104mm BCD crank. Now you're at 50mm. Note - All OneUp 94/104BCD rings include 2mm spacers to tune chainline.
    - Last the OP mentioned moving the 2.5mm BB spacer that is usually behind the driveside BB cup to the non-driveside. That puts him at 47.5mm

    I hope that helps,
    Jon @ OneUp

  6. #6
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    Quote Originally Posted by OneUp View Post
    The OP bike has an XT 2X crank.

    - The 2X chainline would be ~49mm (average of the chainlines of the two rings)
    - It you mount a flat narrow-wide ring to that crank you get ~52mm (because it mounts in 104mm position)
    - The ring mentioned has 2mm built in spacers to allow it to fit a 104mm BCD crank. Now you're at 50mm. Note - All OneUp 94/104BCD rings include 2mm spacers to tune chainline.
    - Last the OP mentioned moving the 2.5mm BB spacer that is usually behind the driveside BB cup to the non-driveside. That puts him at 47.5mm

    I hope that helps,
    Jon @ OneUp


    Thank you.

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