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  1. #1
    mtbr member
    Reputation: gthcarolina's Avatar
    Join Date
    Mar 2005

    Did I buy the wrong cog?

    I just purchased a Plazmatic 18 tooth "front-threaded" cog to go on the fixed side of my flip-flop hub. It threads on nicely and contributes to a good chainline but its base is wider than typical. There is no room to put a lock ring on the hub outside the cog. Does this spell disaster? Seems like the cog will only get tighter with use, unless I try to use the crank to stop the rear wheel when in fixed mode.
    germs, needles, milk, death, snakes, mushrooms, heights, crowds, elevators

  2. #2
    mtbr member
    Join Date
    Aug 2007
    Yes, it spells disaster. It is probably for a trials bike with a crank freewheel, thus the cog does not need to have a lockring as you cannot apply backpressure. You need a lockring, or a ghetto fix, which may be permanent. Get a different cog. Try Surly. You can try machining yours down until you can get a lockring on.

  3. #3
    meh... whatever
    Reputation: monogod's Avatar
    Join Date
    Feb 2006
    rotafix it with red loctite and it won't back off. ever.

    to remove you'll need to heat it with a torch to about 150 degrees and then back it off with a chainwhip.

    or you could just buy a surly cog and lockring (or use a lockring you currently possess) and be done with it retaining the ability to remove it at will.
    "Knowledge is good." ~ Emil Faber

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