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twentysprocket
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Dropping a SS chain
07/30/15 at 12:52am
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Once my chain has a little slack, the chain tends to jump off the chainring or the cog, specially when going over bumps, roots, and rocks while pedaling. Currently I have a KMC SS chain. Surly cog and chainring. 
Would switching to a narrower chain such as an 8 speed chain make for fewer problems?
  
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rob1035
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Re: Dropping a SS chain
Reply #1 - 07/30/15 at 1:42am
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How is your chain line?  How slack are we talking when it drops?
  
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Re: Dropping a SS chain
Reply #2 - 07/30/15 at 1:49am
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Why do you have slack on an ss? I tend to run mine a little loose but I still don't think I could get the chain off the teeth? Are you using non ramped chain rings?
  
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Re: Dropping a SS chain
Reply #3 - 07/30/15 at 1:00pm
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I had the same problem on a few steel frame single speeds till Jerry made me a guide out of an old cassestte for the rear gear...................never droped another chain, and to be honest standing up climbing on a SS and pitching the chain sucks. I guess the frame flex was my problem.
  
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Re: Dropping a SS chain
Reply #4 - 07/30/15 at 5:55pm
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If your using a half link with that KMC chain, you can not run a narrow wide ring.  Sounds like your chain line might not be straight.
  
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twentysprocket
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Re: Dropping a SS chain
Reply #5 - 08/02/15 at 9:47pm
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Hardly any slack. Chain line looks straight, but that is just eyeballing it. When I adjust and move the axle back to account for chain stretch, there is hardly any slack. Once the chain gets a slight slack, as in moving up and down the width of the chain up and down, then the damn thing starts dropping.
Is eyeballing the line enough?
  
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Re: Dropping a SS chain
Reply #6 - 08/02/15 at 9:56pm
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If it is a 410 chain get rid of it and get a KMC 610. I can run mine so loose I can pull it off by hand but it doesn't fall off.
  
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twentysprocket
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Re: Dropping a SS chain
Reply #7 - 08/02/15 at 10:44pm
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Line was off by 4 mm; used a straight edge level. Just another lesson to not rely on eyeballing things.
  
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