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  1. #1
    Englishman in San Diego
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    Adjusters self-adjusting!

    I have in-line cable tension adjusters (long barrels) on the cables coming out of my Shimano STI shifters (Sora). While the one for the front derailleur stays put, I find that the adjuster for the rear derailleur regularly loosens and requires re-tightening mid-ride.

    What could the reason for this be, please?

  2. #2
    Great State of Varmint Panthers007's Avatar
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    A. Cable-slippage at the pinch-bolt?

    B. Normal-stressing of the cable as you change gears?
    How do you keep an idiot in suspense?

  3. #3
    Senior Member joejack951's Avatar
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    Check that the ferrule is spinning freely in the adjuster. If not, turning the adjuster will simply wind up the housing like a nipple seized on a spoke. The vibration from riding will eventually cause the housing to untwist and spin the adjuster back to it's original starting point. I only suggest this really odd sounding problem as the cause because it happened to me. Corrosion built up inside of the adjuster causing the ferrule to get stuck. A new ferrule and cleaning out the adjuster solved the problem.

  4. #4
    Englishman in San Diego
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    Thanks guys. It's definitely not cable slippage on the pinch bolt and the ferrules spin freely in the ends of the adjuster. I wonder if the spring inside the adjuster has snapped or something? I'm assuming there is a spring in there?

  5. #5
    Senior Member joejack951's Avatar
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    It's possible that the detents that hold the position of the adjuster are worn. You can try removing the adjuster and filing the grooves deeper to restore the detents.

  6. #6
    Englishman in San Diego
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    I don't think there are any detents as this is not an indexed adjuster, just a regular threaded one. I've seen in another thread that people have applied Loctite to the threads to keep them from unscrewing, so I will give that a go...

  7. #7
    Senior Member DannoXYZ's Avatar
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    There should be a locknut that you can use to lock the assembly. It's a small threaded ring at the end.

  8. #8
    Senior Member vredstein's Avatar
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    Most inline cable adjusters don't have a spring. I have the same problem using an inline adjuster with my Nexus internal gear hub. With no spring to provide stable tension, the barrel is free to self-adjust as the bike is shifted and the tension in the cable fluctuates.
    "See, it's not that getting wet is a big deal. Really, it's what you're getting wet with.
    Fenders....because it's probably urine."
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