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  1. #1
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    Reputation: Elmo's Avatar
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    Bonking ... not feelin' well 34 tooth hitting rear mech top pully

    I put on a 11-34 XT cog on my wife's 2004 feminine Jekyll and the top mech pully is hitting the 34 tooth. I can hear it and feel it when I ride, that's how bad it is. I tried to adjust the little screw but it didn't help that much. In the end I rigged it so it's running fine now but I'd like to find a better solution for the problem. I'm thinking maybe the hanger was designed for up to 32 tooth cog. Anyone have any ideas?
    Cowboy's wear Hats not Helmets!

  2. #2
    FIRENZE rulez !!
    Reputation: eliflap's Avatar
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    use a 10T pulley

  3. #3
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    In some rear mechs the spring adjusted by the screw you mention have two positions: on my very old xtr this is accomplished by two holes in which the spring can be attached. I had the same issue and solved it this way. Unfortunately this means you need to disassemble the spring assembly and reassemble it can be tricky because the spring has to be preloaded.

  4. #4
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    Reputation: amillmtb's Avatar
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    Quote Originally Posted by Elmo
    I tried to adjust the little screw but it didn't help that much.
    Do you mean B-Tension? (Ignore the letters on the image, its just the first picture of the b tension screw that I found)



    Skip to 1:18

    http://bicycletutor.com/adjust-rear-derailleur/

  5. #5
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    Yep: I opened the mech and found that I could preload the spring harder by putting the spring end in another hole.

  6. #6
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    Reputation: Elmo's Avatar
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    Quote Originally Posted by amillmtb
    Do you mean B-Tension? (Ignore the letters on the image, its just the first picture of the b tension screw that I found)



    Skip to 1:18

    http://bicycletutor.com/adjust-rear-derailleur/
    Thanks for all the replies! Yes it's the B-Tension screw. It didn't help that much and I maxed it all the way in and then all out. I think I'll try the 10 tooth pully unless someone can explain way it won't work.
    Cowboy's wear Hats not Helmets!

  7. #7
    Just a flesh wound
    Reputation: Prophet Julio's Avatar
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    Does it happen in the big chainring only?

  8. #8
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    Reputation: Elmo's Avatar
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    My wife's in the granny and 34 when it hits. I don't know about any other gears.
    Cowboy's wear Hats not Helmets!

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