SS chain line setup .. best by eye ?

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  • SS chain line setup .. best by eye ?
  • Premier Icon BadlyWiredDog
    Subscriber

    I used a steel rule and spaced the cog so it was at the same distance from the centreline as the chainring.

    miranmtb
    Member

    I used my mad math skillz 😈
    * my rear hub width is 135mm
    * shimano middle ring chainline is 50mm
    * did the math (135/2)-50 = 17.5
    * measured 17.5mm from the dropout to cog center
    works fine

    stumpy_m4
    Member

    Just wondered how peeps set there chain line up on there Singles ? … Do you do it by eye or some other means ? … maybe a straight edge ?
    My SS has recently started throwing the chain ? …. chain line looks ok and there`s plenty of tension, more than i usually run ?

    Premier Icon shortcut
    Subscriber

    Put chain set and ring on.
    Put sprocket on free hub body no spacers
    Put chain on.
    Spin the cranks and the sprocket will align itself.
    Work out how many spacers you need each side of the perfectly centred sprocket.
    Fit spacers and lock ring.
    Go for a ride.

    1) Random number of spacers on the left, sprocket, spacers on right untill lockring tightens.

    2) Does it look about right

    Yes – ride
    no – repeat 1

    pdw
    Member

    Straight edge. Place it against the outside of the chainring and see where it ends up at the back. Rotate the chainrings to a couple of different positions to check that it’s not bent. This method is directly measuring the thing that matters – the angle between the chain and chainring. That said, this method only confirmed what I could already see by eye…

    Measuring and calculating the distance from the centre line depends on your frame being true. Mine was off by a couple of mm.

    cfinnimore
    Member

    Spoons got it.

    Stick bike in stand, rotate drivechain, engage calibrated eye, repeat.

    *find hill, slip chain, get off, allen key out, fix*

    There are easier ways, i’m sure.

    bencooper
    Member

    Customer’s bike: use a chain line gauge, and move spacers around until it’s exactly straight.

    My bike: randomly put it together because it really doesn’t matter in the slightest 😉

    cfinnimore
    Member

    Slightly off topic but y’know what I realised while making a Singleator today?

    That device removes the ballache of spacing.

    slideyslidey.

    Kato
    Member

    I do it by eye and run a proper unramped ring and SS chain

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