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  1. #1
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    Jul 2014
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    Need help on chainline, ran out of ideas

    My front chainline is 47mm and my rear is 40mm.
    I guess i have a problem...

    Specs,
    Frame: Aventon mataro
    bb: Tange seiki 68x107
    rear wheel: cheap state bicycles deep v
    hub: Quando 32H x 14G (120mm between the locknuts)
    cog: All city 17t stainless cog
    Crankset: F5 Lattice 49t

    Not enough place to put the chainring under the spider (the teeth would touch the frame).
    Can't put any spacers on the cog because there wont be any place for the lockring.

    I thought that the cranks might be responsible, maybe other model of cranksets pull the chainring closer to the frame.

    All answers are welcomed,

    thanks

  2. #2
    Senior Member hockeyteeth's Avatar
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    Sep 2006
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    Gainesville, Florida
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    What tells you the hub has a 40mm chainline? It should be 42mm. Did you measure it? If you measured it do you have some janky chain tensioner between the locknut and the frame adding a couple mils to your measurement? You could buy a BB with a 103mm spindle, which is what F5 apparently recommends anyway:

    Quote Originally Posted by fancy crank mfg.
    On a standard 68mm bottom bracket shell, a 103mm BB will give a 42mm chainline, 107mm for 44mm.

  3. #3
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    Yeah,
    Mesured the full length divided by two (60mm), took off the space between the forkend and the cog(18.5mm) and half of the width of the cog (1.5mm).

    Measured with a dial caliper.

    Thinking that the cranks might be a factory defect. With a 107mm bb it should give me 44.

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