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  1. #1
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    Help: chain tension problem?

    Hi guys

    I'd really appreciate it if someone would be able to assist me, before I resort to taking my bike down to my LBS to get fixed.

    I took my chain off yesterday to clean it and left it off overnight. I just recently put the chain back together (SRAM powerlink) and noticed that when I am in the small chain ring at the front and about 7th gear at the back, the underside of the chain starts to touch the top of the two jockey/pulley wheels. It's almost as if tension has been lost.

    Any suggestions as to what the problem may be? I haven't adjusted anything.

    I've attached a picture to try and indicate the problem I am having.

    Thanks in advance!

    2009 Specialized Stumpjumper FSR Comp | 2009 Specialized Roubaix Comp | 2008 Specialized Langster New York

  2. #2
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Quote Originally Posted by mikkelz
    Hi guys

    I'd really appreciate it if someone would be able to assist me, before I resort to taking my bike down to my LBS to get fixed.

    I took my chain off yesterday to clean it and left it off overnight. I just recently put the chain back together (SRAM powerlink) and noticed that when I am in the small chain ring at the front and about 7th gear at the back, the underside of the chain starts to touch the top of the two jockey/pulley wheels. It's almost as if tension has been lost.

    Any suggestions as to what the problem may be? I haven't adjusted anything.

    I've attached a picture to try and indicate the problem I am having.

    Thanks in advance!

    Normal. Don't use the small ring and smaller cogs.
    mtbtires.com
    The trouble with common sense is it is no longer common

  3. #3
    I Am Specialized
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    Thanks for the reply, but it didn't do that previously.
    2009 Specialized Stumpjumper FSR Comp | 2009 Specialized Roubaix Comp | 2008 Specialized Langster New York

  4. #4
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by mikkelz
    Thanks for the reply, but it didn't do that previously.
    I bet it did. The only ways it could have changed are if you lengthened the chain or mis-routed the chain through the derailleur.
    mtbtires.com
    The trouble with common sense is it is no longer common

  5. #5
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    if you wanna know if the chain lenth is ok is to put the chain on big ring and big cogs without route the chain in the derailleur and ad 2 link's

    http://bicycletutor.com/calculate-chain-length/

  6. #6
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    Looks normal to me. You shouldn't be using smaller cogs and the small chainring for that very reason. The rear derailleur can only make up so much chain with a wide range of gears.

  7. #7
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    Thanks for the replies guys. I could've sworn I never noticed this before and I am sure I've ridden in 7/8/9 and the first chain ring. I definitely won't be doing that again!

    Another lesson learned...
    2009 Specialized Stumpjumper FSR Comp | 2009 Specialized Roubaix Comp | 2008 Specialized Langster New York

  8. #8
    mtbr member
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    Quote Originally Posted by mikkelz
    Thanks for the replies guys. I could've sworn I never noticed this before and I am sure I've ridden in 7/8/9 and the first chain ring. I definitely won't be doing that again!

    Another lesson learned...

    The smallest cog I go in in the granny ring is the fifth. Keep in mind that as a derailleur gets older, the springs can get worn which might account for a little tension loss, but your setup looks normal.

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