Chainring Centering-
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  1. #1
    Drinking the Slick_Juice
    Reputation: nuck_chorris's Avatar
    Join Date
    Jun 2008

    Chainring Centering

    I was wondering what was is the best way to center a chainring. I centered it as best as i could and it seemed to work but as soon as I got on an cranked on it , it came uncentered and made the chain have a tightspot . Would small shims in the gaps work? the cranks I have are Redline Microline paired up with a surly ring. I know there always is going to be a tightspot but is there a better way to keep it centered?
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  2. #2
    mtbr member
    Join Date
    Jul 2004
    Single bolt is too short to give enough sleeve height, I'd use double plus spacer(s) to ensure enough insert.

  3. #3
    got spirit, losing feelin
    Join Date
    May 2009
    I have same problem - would a eno crankset solve the problem?

  4. #4
    one chain loop
    Reputation: fishcreek's Avatar
    Join Date
    Apr 2007
    loosen the chainring bolts with the chain on, turn the cranks and tighten the bolts where the tight spot is used to be. you might have to adjust the tension from the rear hub if everything fails.
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  5. #5
    mtbr member
    Join Date
    Sep 2007

    Chain Tension
    The chain tension on a fixed gear is quite critical, and is regulated by moving the rear axle back and forth in the fork ends. If the chain is too tight, the drive train will bind, perhaps only at one angle of the pedals (chainwheels are not usually perfectly concentric). It should be tight as it can be without binding. If the chain is too loose, it can fall off, which is quite dangerous on a fixed gear.

    Set the rear axle so that the chain pulls taut at the tightest part of the cranks' rotation. One at a time, loosen up each of the stack bolts, and tighten it back just finger tight. Spin the crank slowly and watch for the chain to get to its tightest point. Strike the taut chain lightly with a convenient tool to make the chain ring move a bit on its spider. Then rotate the crank some more, finding the new tightest spot, and repeat as necessary.

    This takes a little bit of your hands learning how hard to hit the chain, and how loose to set the stack bolts, but it is really quite easy to learn.

    Tighten up the stack bolts a bit and re-check. Tighten the stack bolts in a regular pattern, like the lug nuts on a car wheel. My standard pattern is to start by tightening the bolt opposite the crank, then move clockwise 2 bolts (144 degrees), tighten that one, clockwise 2 more, and so on. Never tighten two neighboring bolts in a row. You may prefer to go counterclockwise, but try to get in the habit of always starting at the same place and always going the same way. This reduces the chances of accidentally missing a bolt.

    Once you have the chainrings centered and secured, adjust the position of the rear axle to make the chain as nearly tight as possible without binding. Notice how freely the drive train turns when the chain is too loose. That is how freely it should turn when you are done, but with as little chain droop as possible.
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