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  1. #1
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    1X Chainline Setup (Regular and Boost) by OneUp Components

    Have you converted your bike to 1X in the past 5 years? If so, your chainline could be causing premature drivetrain wear.

    Whether you will be running Boost or sticking with a 142mm rear end the following post will help you navigate your way to a smoother running, longer lasting drivetrain that will save you money.

    Understanding Chainline for Optimal 1X Conversions (Boost and Non-Boost - OneUp Components

    Enjoy the read.
    Jon @ OneUp

  2. #2
    Anytime. Anywhere.
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    Thank you that's informative and easy to understand. My 142mm bike with RF direct mount and M8000 11 speed had poor chainline in the large cogs because the cassettte is wider and the 42t is closer to the centre line. I finally got a Garbaruk ring with 47mm chainline and it's better. I curious to see what you come up with in 2016.
    I got some bad ideas in my head.

  3. #3
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    I would like to see some info regarding rear cassette chainline and how it relates to the chainring. I personally disagree with 49-50m chainline as being 'ideal' , for certain conditions and riding styles it may be optimal but based on my experience and observations 45-47mm would probably suit most riders better.

    Time wise, 75% of most rides is spent climbing so it makes sense to avoid extreme chain angles while in those gears. I have not experienced problems with chain retention running straight-ish (~45) chainlines in bigger gears but then again I'm no enduro pro.

    Thanks for posting!

  4. #4
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    Same here with the lower chainline. With a stock XX1 GXP 49mm...I was dropping chain in the 42T. When I switched to the Garbaruk 47.7mm CL...the backpedal drop stopped and there was also less noise from the chainring while in the 42T. 1.3mm made the difference for me.

    I spent some time on a 650 Stumpy with XX1. The chain on that bike would drop on the first backwards rotation of the crank in the 42T.

    Has anyone measured the difference in width between a 10 and 11sp cassette?

  5. #5
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    In our experience, in our riding terrain, 49mm provides the best performance for balancing wear. You do spend a high percentage of time in the low, (42T ish), end of the cassette but the chain is far more active when at speed in the high end.

    I can see a person riding smoother trails or climbing more preferring a narrower chainline as much as a park rat preferring a wider chainline.

    Our main point here is that the 52mm chainline that many people are setup with is not ideal for the vast majority of riders.

    Cheers,
    Jon @ OneUp

  6. #6
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    How about a smaller front ring to bring the chain line average use more down to the middle of the cassette?

  7. #7
    Mantis, Paramount, Campy
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    Quote Originally Posted by OneUp View Post

    Our main point here is that the 52mm chainline that many people are setup with is not ideal for the vast majority of riders.

    Cheers,
    Jon @ OneUp
    52mm is really wide.
    I personally would start around 47mm and adjust from there
    *** --- *** --- ***

  8. #8
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    Quote Originally Posted by Shayne View Post
    52mm is really wide.
    I personally would start around 47mm and adjust from there
    Agreed 52mm is too wide. The purpose of the chart is to get people down to ~49mm.

  9. #9
    since 4/10/2009
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    What about fatbikes?

  10. #10
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    Quote Originally Posted by Harold View Post
    What about fatbikes?
    Now isn't that a can of worms...

    Ideal for a 135/142mm rear end is 49mm. From there the ideal chainline goes out as follows:

    Boost 148mm, +3mm, 52mm
    DH 150/157mm, +7.5mm, 56.5mm
    Fat Bike 170/177, +17.5mm, 66.5mm
    Fat Bike 190/197, +27.5, 76.5mm

    Add to that the upcoming plus narrow and plus wide and it's enough to make your head spin.

    I hope that helps,
    Jon @ OneUp

  11. #11
    since 4/10/2009
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    Quote Originally Posted by OneUp View Post
    Now isn't that a can of worms...

    Ideal for a 135/142mm rear end is 49mm. From there the ideal chainline goes out as follows:

    Boost 148mm, +3mm, 52mm
    DH 150/157mm, +7.5mm, 56.5mm
    Fat Bike 170/177, +17.5mm, 66.5mm
    Fat Bike 190/197, +27.5, 76.5mm

    Add to that the upcoming plus narrow and plus wide and it's enough to make your head spin.

    I hope that helps,
    Jon @ OneUp
    Thank you.

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