Does chain line make noticeable difference?-
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  1. #1
    mtbr member
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    Nov 2018

    Does chain line make noticeable difference?

    My hardtail is an NS eccentric 29er, currently running Gx cranks but changing to a shimano drivetrain. I would like to be able to fit a 34 T ring instead of my 32T but clearance is tight.

    My current chainline is 52 mm I noticed shimano make an SLX FC-M7120-1 which has a 55mm chainline instead of 52 so I may be able to fit a 34T

    This changes Q factor from 172 to 178mm, will this be noticeable?


  2. #2
    This place needs an enema
    Reputation: mikesee's Avatar
    Join Date
    Aug 2003
    You won't likely notice the change in Q factor.

    You're much more likely to notice that your chain drops off the large cog if you backpedal in the slightest. And it will get worse as your drivetrain wears.

  3. #3
    mtbr member
    Reputation: Lone Rager's Avatar
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    Dec 2013
    Yeah. Not a huge deal IMO, but I do prefer a closer in chainline that favors the larger cogs, where I do most all my pedaling. I run non-boost ring/cranks on boost bikes. It is only 3mm diff.
    What, me worry?

  4. #4
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    Change your cassette
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  5. #5
    Magically Delicious
    Reputation: Cleared2land's Avatar
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    Aug 2012
    Quote Originally Posted by Nurse Ben View Post
    Change your cassette
    That could be challenging finding a cassette geared to your preference.
    A bad day of cycling is better than a good day at work

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