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  1. #1
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    Tall boy carbon gear problem

    I am the new (happy) owner of 2012 Tall boy Carbon M size came originally with SPX kit which was upgraded as follows:

    Shimano HG74 Chain 10 Speed (came with the SPX build kit from santacruz)
    XTR 11-36 Cassette
    Front derailleur XTR FD 981 - 3 Speed
    SRAM XO Rear derailleur long cage 10
    Sram XO Shifters 3*10
    Black XT 3 rings crankset (came with the SPX build kit from santacruz pre-installed)

    The problem that I have:
    When I go on the 2nd ring on the XT crankset and on the 1st gear on the rear XTR 36 Cassette and I pedal to the backů. The chain goes off to the 3rd ring on the cassette.
    The chain line looks bad!

    Please help (it does not happened on pivot 429 with same set up)

    The local dealer did not know how to solve it!

    Thank you
    Attached Thumbnails Attached Thumbnails Tall boy carbon gear problem-img-20111214-00237.jpg  


  2. #2
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    I would first check the alignment of the drop-out. Is the rear deraileur parallel to the chainline. Park Tools makes a tool for checking and adjusting alignment in vertical and horizontal axis'.

    I'd be interested in knowing how your tires handle Israel trail conditions. I'm bringing my TBc over when I return and have doubts about the OEM Maxxis Crossmarks.
    Last edited by lkfoster; 12-18-2011 at 07:08 AM. Reason: Question about tires

  3. #3
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    I've had similar problems with new chains, they have a thick waxy grease that makes them stiff. I rinse it of with clean degreaser and oil. Worked for me.

  4. #4
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    you should try to find a competent mechanic at another bike shop if possible, it sounds like its simply the alignment of the front derailler, or a cable tension adjustment. Not a complicated thing to solve.
    here we go again

  5. #5
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    Quote Originally Posted by eleven-yo View Post
    you should try to find a competent mechanic at another bike shop if possible, it sounds like its simply the alignment of the front derailler, or a cable tension adjustment. Not a complicated thing to solve.
    You should properly understand a situation before commenting and slagging the mechanic....

    The chain is coming off of the top of the cassette when the chain is back-pedaled. Derailleur adjustment is a non-factor.

  6. #6
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    Tiers I am using are rear small block 8 front maxxis icon - not the one thsat came with the SPX kit

    I checked the alignment of the front derailler no impact
    check the alignment of the drop-out it is 100%

    the chain line looks like it can never work - any ideas how to solve it?

  7. #7
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    Are you sure that you have the right amount of spacers under the BB cups (and on the right side)?
    Filme von Draussen!
    Bikes: Nomad, Chameleon, 5.Spot, DHR

  8. #8
    TCW
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    this might be a dumb question but is the chain installed the correct way? With Dyna-Sys it is directional. Just a thought.

  9. #9
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    Does everything function pedaling forward?
    If so, it sounds like a non issue.

  10. #10
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    Yes I am sure about the Chain installed fine.
    Yes forward it all function perfect
    Regards the number of rings on the BB - it was preinstalled by SC - it has ring on the right side.

    I checked with friend the has tallboy - L - same gears but with XTR 2 rings cranckset, this problem at this bike exists rarely and only after 4-5 rotating backwards.

  11. #11
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    Got official answer from SC - So just to update here some qoute - and if someone has solution for me I will be more then happy .....



    "this is pretty normal. Pedaling forward- the chain should stay on, but I would expect the chain to fall off when pedaling backwards in this gear." "Regardless, this really shouldn't be an issue while riding."

  12. #12
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    That sounds strange to me, I've been lubing chains for years now by spinning the cranks backwards. The only time that I have the chain jumping cogs is if I'm crossed up on the chain line (i.e. big ring and small cog) or if the tip pushes the chain sideways.

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