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  1. #1
    mtbr member
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    2 x 9 and chain alignment

    Is there a way to improve the chainline on a 2x9. I figure my chain doesn't have to span the same width so I'd like it to be more centered on the cassette.

    I'm using shimano shifters and derailleurs.

    Thx,
    MTB-)

  2. #2
    aka 'Grover'
    Reputation: aussie_yeti's Avatar
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    use a narrower bottom bracket. usually bikes come with a 113mm spindle for a triple ring setup. when going to a double change to something around 107/108 mm. Either that or use spacers to move your chainrings further towards the frame.

  3. #3
    Do It Yourself
    Reputation: Homebrew's Avatar
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    Depends on the cranks and bb. You might be able to get a narrower spindle or move some spacers around.
    Long Live Long Rides

  4. #4
    hands up who wants to die
    Reputation: rpet's Avatar
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    What shifting problem are you trying to fix?

    Usually replacing the big chainring with a bashguard and going 2x9 doesn't require any additional fiddling (besides the front derailleur High limit screw).

    -r

  5. #5
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    Thanks for the replies so far.

    I'd like the chainline from the big ring to the inside cog to be straighter. I don't have any spacers on the BB so I don't see how the big ring can be moved more inward.

    MTB-)

  6. #6
    mtbr member
    Reputation: wickerman1's Avatar
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    I have the same problem...

    Quote Originally Posted by MTB-]
    Thanks for the replies so far.

    I'd like the chainline from the big ring to the inside cog to be straighter. I don't have any spacers on the BB so I don't see how the big ring can be moved more inward.

    MTB-)
    Actually when im on the big ring( middle ring actually) and on the biggest cog, the chain will come off the ring and go to the smaller ring... chain line on my bike is shite.
    About the spacers... I'm guessing you would put theses between the crank arm and the ring so to speak( on the bolts obviously).
    What about a cassette spacer?I checked mine and can put a thin one in there without the cogs hitting the frame.

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