10sp 105 rear STI shift/brake missing...
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  1. #1
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    10sp 105 rear STI shift/brake missing...

    It's 10 years old. When I attempt to go from big to small in the cluster the shifter misses. It takes sometimes 2/3 attempts to get it to drop in many gears.

    Ideas?

  2. #2
    'brifter' is f'ing stupid
    Reputation: cxwrench's Avatar
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    Very common w/ all types of Shimano shifters. The grease that was used when it was originally built is getting sticky. Spray inside the shifter w/ WD40 or a spray solvent or spray lube then shift the crap out of it. If you direct the spray where the cable is installed you should be fine. They nearly never break, they just get sticky.

    Whatever you do don't attempt to take it apart in any way.
    #promechaniclife

  3. #3
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    Some sort of friction not allowing enough cable to release, probably.
    Could be a frayed cable inside the shifter so get on it soon because that can suck if it goes to far.

  4. #4
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    Quote Originally Posted by Jay Strongbow View Post
    Some sort of friction not allowing enough cable to release, probably.
    Could be a frayed cable inside the shifter so get on it soon because that can suck if it goes to far.
    Thanks!

  5. #5
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    [QUOTE=cxwrench;5388555]Very common w/ all types of Shimano shifters. The grease that was used when it was originally built is getting sticky. Spray inside the shifter w/ WD40 or a spray solvent or spray lube then shift the crap out of it. If you direct the spray where the cable is installed you should be fine. They nearly never break, they just get sticky.

    I know about not taking it apart. I would not be able to get humpty back together!

    Thanks!

  6. #6
    'brifter' is f'ing stupid
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    Quote Originally Posted by Jay Strongbow View Post
    Some sort of friction not allowing enough cable to release, probably.
    Could be a frayed cable inside the shifter so get on it soon because that can suck if it goes to far.
    If the shifter 'misses' as the OP says it's most likely not a frayed cable. If the paddle or the lever moves but there's nothing happening it's stuck/sticky. If you can feel the paddle and/or lever being more or less normal but the shifting is off in one direction or another right away then that's a frayed cable. Very different feel. Obviously you can undo the cable at the derailleur and push it out of the shifter and look as well.
    #promechaniclife

  7. #7
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    It's probably the thing cxwrench suggests, I've experienced that one myself with old 6600 or 7800 shifters (I forget which).

  8. #8
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    NVM, thanks.
    Last edited by Scottay5150; 03-02-2020 at 05:12 PM.

  9. #9
    .je
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    Is it like this?
    https://forums.roadbikereview.com/co...ft-314443.html

    Mine did that when it was about 10 hours old. It still does this but not as much. It is worst in cold weather such as below freezing.

    Lubing with Prolink or something like that improves it for a few months.

  10. #10
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    It is only when I am going from bigger to smaller cogs in the back. I am going to hit it with WD40 tomorrow. I think it should fix it.

  11. #11
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    The WD40 worked like a charm.

  12. #12
    'brifter' is f'ing stupid
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    Quote Originally Posted by Scottay5150 View Post
    The WD40 worked like a charm.
    You're welcome.
    #promechaniclife

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