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  1. #1
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    Fixed gear removal - Motobecane Fantom Uno

    I bought a Fantom Uno several weeks ago new. It has a flip flop hub. I've wanted to put a smaller sprocket on the fixed side. I've removed the locking ring, but can't get the sprocket to budge at all. I've pulled on my chainwhip tool as hard as I can. I've tried to force the cranks with my front wheel against the wall, and nothing happens. When I first bought the bike, I could feel the sprocket seating in the backward pedal direction. Any suggestions for breaking this free?

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    Lbs.

  3. #3
    chickenosaurus j3ffr3y's Avatar
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    Quote Originally Posted by xkillemallx16 View Post
    Lbs.
    reverse rotafix
    http://204.73.203.34/fisso/eng/schpignone.htm
    2010 Motobecane Team Track
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  4. #4
    Antarctica awaits WoundedKnee's Avatar
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    Quote Originally Posted by j3ffr3y View Post
    This.

  5. #5
    Blaster of Reality Scrodzilla's Avatar
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    Yup.

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    So when I got my Motobecane Messenger the cog was on there with red loctite. Took a torch to heat it up to get it loose.

    Roland

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    Quote Originally Posted by Roland Owens View Post
    So when I got my Motobecane Messenger the cog was on there with red loctite. Took a torch to heat it up to get it loose.

    Roland
    I could feel the cog move when braking with the pedals, and there is no evidence of locktite. The lockring came off easy too. I will have to give this method a try tonight. Thanks for the advice.

  8. #8
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    What? No! dont need a blow torch!
    You werent really going to try that were you?

    As others said, try reverse rotafix. If that doesnt do it, then use a torch. Reverse rotafix will give the most torque using a simple method.

  9. #9
    car dodger norskagent's Avatar
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    I've had luck using the dubious method of wrapping the chain whip so the cog is fully engaged, then carefully stomping on the chain whip handle. I don't recommend this, but it has worked for me several times.
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  10. #10
    Veteran Racer TejanoTrackie's Avatar
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    An effective alternate method that has worked well for me is to strike the end of the chain tool handle with a steel hammer. This applies a short duration very high impact force that will break the cog free. The principle is similar to an impact wrench. I strongly recommend wearing heavy work gloves when doing this.
    What, Me Worry? - Alfred E. Neuman

    Quote Originally Posted by Dcv View Post
    I'd like to think i have as much money as brains.

  11. #11
    extra bitter kyselad's Avatar
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    Quote Originally Posted by egraetze View Post
    I bought a Fantom Uno several weeks ago new. It has a flip flop hub. I've wanted to put a smaller sprocket on the fixed side. I've removed the locking ring, but can't get the sprocket to budge at all. I've pulled on my chainwhip tool as hard as I can. I've tried to force the cranks with my front wheel against the wall, and nothing happens. When I first bought the bike, I could feel the sprocket seating in the backward pedal direction. Any suggestions for breaking this free?
    Just to make sure there isn't something very basic going wrong here, you previously felt the cog unscrewing when backpedaling, yes? "Seating" makes me think of tightening the cog. Since you have a chainwhip, I'm guessing you understand the threading directions properly, but I figured it's worth verifying that you're going in the right direction.

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    Also, if you already felt the cog unthreading and you already have the lockring off, you could try skidding without the lockring on. You may generate enough force to unthread the cog. Thats how I have gotten my cog off before. Jump off the bike before the cog spins out though, because you could damage the threads if the cog is loosely spinning on the hub threads for too long.

  13. #13
    Veteran Racer TejanoTrackie's Avatar
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    Quote Originally Posted by kyselad View Post
    Just to make sure there isn't something very basic going wrong here, you previously felt the cog unscrewing when backpedaling, yes? "Seating" makes me think of tightening the cog. Since you have a chainwhip, I'm guessing you understand the threading directions properly, but I figured it's worth verifying that you're going in the right direction.
    Excellent point. The cog unscrews counter-clockwise (lefty-loosey), whereas the lockring unscrews clockwise (righty-loosey). The OP may have been unintentionally tightening the cog instead of loosening it.
    What, Me Worry? - Alfred E. Neuman

    Quote Originally Posted by Dcv View Post
    I'd like to think i have as much money as brains.

  14. #14
    Goon
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    I guess I just don't understand why people put loctite on their lockring/cog.

    In fact I put a little bit of grease on there and then tightened them *****es down. never had a problem.
    No matter how bad things get, they can't get any better, and they can't get any worse, things are what they are, so you better get used to it Nancy, quit your B*tchin'

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  15. #15
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    Quote Originally Posted by TejanoTrackie View Post
    Excellent point. The cog unscrews counter-clockwise (lefty-loosey), whereas the lockring unscrews clockwise (righty-loosey). The OP may have been unintentionally tightening the cog instead of loosening it.
    Thank you for the clarification. The lockring had a left hand thread, so I assumed the same for the cog. I didn't realize that the cog may be on a larger diameter thread. I probably should have looked at the smaller replacement cog. I will try the chainwhip again in the correct direction, then try the trick method to get it off if that doesn't work. I hope I didn't tighten the thing too much now.

  16. #16
    Senior Member Brian's Avatar
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    That could be an expensive assumption.

  17. #17
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    Quote Originally Posted by Brian View Post
    That could be an expensive assumption.
    I tried the cog removal making use of the trick method and it worked great. Thanks for the help.

  18. #18
    Truck Driver Totaled108's Avatar
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    Just to clarify, when you take the lockring off, the cog unscrews in the opposite direction the lockring unscrews. When you said you tried taking it off by putting the front wheel against a wall, you were tightening it up more.

    Oops, already fixed...
    Last edited by Totaled108; 06-03-10 at 08:45 AM. Reason: already answered, but I'll still leave it.
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