I can't take it! (chain falling off)- Mtbr.com
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  1. #1
    get down!
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    I can't take it! (chain falling off)

    okay, I'm about to sell off my KM and all of it's parts for a simple singlespeed frame...this is killing me.

    I have a bolt on XT disc wheelset, Surly Tuggnut, Sram PC1 chain, Suffering front and Shimano DX cog on the rear. 7" avid discs on the rear and the chain keeps coming off...non stop....non f'ing stop. what more can I do?

    this is killing me cause I can't even ride and I've tried several times, first time I tried I thought a Tuggnut would stop it....nope....then I traded my 116bb for a 112.5.....nope....then I bought another wheel (thanks curtis) from AC disc lite to a XT bolt on...nope


    nope, nope, nope.

    I can't wait 3 months for a custom build and 29'ers aren't to be found...I might have to go back to 26 :^(
    Rudy Projects look ridiculous

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  2. #2
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by appleSSeed
    okay, I'm about to sell off my KM and all of it's parts for a simple singlespeed frame...this is killing me.

    I have a bolt on XT disc wheelset, Surly Tuggnut, Sram PC1 chain, Suffering front and Shimano DX cog on the rear. 7" avid discs on the rear and the chain keeps coming off...non stop....non f'ing stop. what more can I do?

    this is killing me cause I can't even ride and I've tried several times, first time I tried I thought a Tuggnut would stop it....nope....then I traded my 116bb for a 112.5.....nope....then I bought another wheel (thanks curtis) from AC disc lite to a XT bolt on...nope


    nope, nope, nope.

    I can't wait 3 months for a custom build and 29'ers aren't to be found...I might have to go back to 26 :^(
    Chainline! Chainline! Chainline!
    Move the spacers around on the freehub to get the cog inline with the chainring. If it is perfectly straight it should not come off. Make sure the wheel is straight in the frame, too.

    BTW Avid does not make 7" rotors, just 160 mm, 185 mm and 203 mm (used to make 165 mm).
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  3. #3
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    2nd the make sure the wheel is straight in the frame...

    chain will not be happy if cog and ring are not in the same plane. Personal experience.

  4. #4
    KgB
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    SNGLSPD
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    use a straightedge

    make sure you have a perfect chainline
    make sure rear wheel is straight in dropout
    make sure your chainring is flat,straight and no bent teeth
    Good chain tension,not too tight
    you will have better luck with an 8 speed chain also(pc-68)

    Have another beer chill out and take another look at everything
    I've been inside too long.

  5. #5
    Master of the Obvious
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    Do Not Pass Go!

    If all else fails take your Bike to your LBS, that speaks SS!

  6. #6
    try driving your car less
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    does it fall off the front ring or the rear?
    like the others said, check the chainline.
    Only boring people get bored.

  7. #7
    One gear to rule them all
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    I wonder if the 1/8 chain with 3/32 cog and ring is not causing more problems? Like the others said, chainline would be the first thing to look at. Do you have a digi cam? Maybe you take a shot of the chain from behind the bike. That would help us determine the problem.
    Don't give up on it, it can be corrected. You just need the right mechanic.




    Quote Originally Posted by appleSSeed
    okay, I'm about to sell off my KM and all of it's parts for a simple singlespeed frame...this is killing me.

    I have a bolt on XT disc wheelset, Surly Tuggnut, Sram PC1 chain, Suffering front and Shimano DX cog on the rear. 7" avid discs on the rear and the chain keeps coming off...non stop....non f'ing stop. what more can I do?

    this is killing me cause I can't even ride and I've tried several times, first time I tried I thought a Tuggnut would stop it....nope....then I traded my 116bb for a 112.5.....nope....then I bought another wheel (thanks curtis) from AC disc lite to a XT bolt on...nope


    nope, nope, nope.

    I can't wait 3 months for a custom build and 29'ers aren't to be found...I might have to go back to 26 :^(

  8. #8
    Witty McWitterson
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    I'd go with an 8 speed chain. The PC1 may just be too sloppy on your set up. Another thing, something that no ones mentioned yet, check your frame for cracks. I cracked my chianstay, n8ofire cracked his, and I wonder if there are more that have too. Its a reach, especailly with Surly, but you never know...After that, I'd go down to a 160 rotor in the rear.
    Just a regular guy.

  9. #9
    No relation
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    Another vote for a new chain. And beer.

    Quote Originally Posted by KgB
    make sure you have a perfect chainline
    make sure rear wheel is straight in dropout
    make sure your chainring is flat,straight and no bent teeth
    Good chain tension,not too tight
    you will have better luck with an 8 speed chain also(pc-68)

    Have another beer chill out and take another look at everything
    When I first set up my SS I used some cheap SRAM track chain. It would stiffen up, and come right off the ring. I replaced it with a cheap KMC 8 speed chain (not the same bracket of cheap, but close), and the problem went away. I'm sure my chainline is off, based on the behavior of the first chain, but if the 8 speed chain lets me ignore the chainline and ride, I'm very comfortable with that.
    Don't you ever, don't you ever, stop being dandy showing me you're handsome.

  10. #10
    giddy up!
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    it's not the frame....

    I have a km, and ran a similar setup to yours......suffering up front, king cog or freewhell in the rear.....pc-1 chain, pc-58, pc-69, pc-7x chains, avid discs, no problem.....

    something is not right here, take a picture of it for us, or find a competent shop that knows their stuff....it's definitely an easy fix....
    www.thepathbikeshop.com

  11. #11
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    I had that problem this last weekend

    I had two loose chainring bolts that were allowing me to torque the front chainring out of allignment under full climbing stresses. The other time it kept happening to me, I had about a season and a half on my spot chainring and it had worn down enough to not retain the chain. I changed the chainring and the problem stopped. This is, of course, after you make sure that the chainline is straight. I hope this helps you out.

  12. #12
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    I had that problem this last weekend

    I had two loose chainring bolts that were allowing me to torque the front chainring out of allignment under full climbing stresses. The other time it kept happening to me, I had about a season and a half on my spot chainring and it had worn down enough to not retain the chain. I changed the chainring and the problem stopped. This is, of course, after you make sure that the chainline is straight. I hope this helps you out.

  13. #13
    mtbr member
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    Another Silly Question... Is the chain pretty snug. I ran my converted SS sans tensioner for several months because I lucked out with the "magic gear". Finally the chain stretched, became lose, and started to fall off when I hit rough areas. I installed my tensioner and the problem was solved.
    "I've never been better .... nor cared less!"

  14. #14
    Squalor
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    I replied on the 29er board (NM)

    I wish we could still say (NM) without having to write this stupid little bit of nothing right here!

    Five Letters Why?

  15. #15
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by lanpope
    I wish we could still say (NM) without having to write this stupid little bit of nothing right here!

    Five Letters Why?
    Don't put anything in the subject line (nm)
    mtbtires.com
    The trouble with common sense is it is no longer common

  16. #16
    Squalor
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    But then...

    Quote Originally Posted by shiggy©®™
    Don't put anything in the subject line (nm)

    ...it is not pretty and <b>BOLD</b>

    Just kidding...thanks for the tip

    Lance

  17. #17
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    Probelems

    good chain tension is important
    center wheel in dropouts, this requires correct dishing
    worn out rings are bad.
    I have an aluminum 3-pc sprocket, it got worn at the fix bolt, converter, and teeth.



    ALUMINUM IS GARBAGE

    aluminum brake arm- threads strip
    Aluminum sprocket- bends, wears out, creaks
    alu. nipp's round out.
    Alu cranks are bent
    ALUMINUM IS SH-it!

  18. #18
    Witty McWitterson
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    Quote Originally Posted by ioscope

    ALUMINUM IS GARBAGE

    aluminum brake arm- threads strip
    Aluminum sprocket- bends, wears out, creaks
    alu. nipp's round out.
    Alu cranks are bent
    ALUMINUM IS SH-it!

    If you're a ham fisted mechanic. Not that I'm saying you are or anything...
    Just a regular guy.

  19. #19
    all hail der Fuhrer Bush
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    try a railer

    if the derailing happens off the chainring, try this:
    install an old cheap front derailleur, but instead of positioning it for the normal 2mm bap between the bottom of the cage and the chainring teeth, put it much lower, so the outer cage is actually lower than the diameter of the chainring teeth. so low in fact that the chain barely clears the inside top portion of the cage mechanism. then dial in the inner and outer clearances with the the 2 limit screws until the drivetrain runs without grinding at all on the cage. now the chain cannot come off the chainring.
    that's an old trick for setting up time trial bikes with a single chainring. got it working on a SS right now.

  20. #20
    self destructive
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    while avid does not make a 7" rotor they DO make a 7.283464567" rotor.

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