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  1. #1
    Senior Member
    Join Date
    Dec 2011
    NE Ohio
    My Bikes
    1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
    5 Post(s)
    0 Thread(s)

    Chain Rings Burrs?

    Though I posted this in the Tandem Forum I thought that the wisdom over here would be just as great!!
    The timing chain rings on our tandem have a few small burrs on some of the teeth. I was wondering about taking a file to them?

  2. #2
    Senior Member
    Join Date
    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    153 Post(s)
    1 Thread(s)
    If they're new, the chain will shave them off by itself, so if the chain runs now, feel free to ignore them. On used rings the burrs aren't really burrs, but peens. The rollers roll up the teeth and flow metal to the sides, much as a rolling pin makes dough wider as it passes. The process is self limiting since the insides of the inner plates will wear that material when it gets too wide.

    You're more likely to see this type of flowed burr on tandems, single speed and IGH bikes because the chain runs straight so there's less side wear dressing the teeth. On derailleur bikes the chain coming from the sides wears the flanks of the teeth so it's rare to ever see this type of burr. (I only ever see it on the inner side of my inner road ring).

    You can file them off it you prefer. It doesn't make any difference either way.

    Also note that this burr formation is usually an indicator of a stretched chain, or one running too tight.
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

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