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  1. #1
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    Shimano 105 missing downshifts.

    I have 9 spd 105, and occassionally, when I go to down shift, usually onto the biggest cogs, the lever moves with absolutely no resistance, and of course, no shift. I let it return and shift again and it works. I cleaned it out with solvent and haven't been able to check it yet, but if its not fixed, any ideas?
    Il faut de l'audace, encore de l'audace, toujours de l'audace

    1980 3Rensho-- 1975 Raleigh Sprite 3spd
    1990s Raleigh M20 MTB--2007 Windsor Hour (track)
    1988 Ducati 750 F1

  2. #2
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    I would flush out the shifters really well with WD40. New shift cables and housings may also be needed. You could try lubricating the cable where it runs through the short housing just before the rear derailleur. Often this will improve shifting.

    Al

  3. #3
    Senior Member fixed.rider's Avatar
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    Sometimes they get gooked up and will miss shifts like that. I have used carb cleaner (spray can variety) w/ a lot of success. Spray in, let sit a few mins, wipe off excess and shift away good as new. Spray triflow will also sometimes work.

  4. #4
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    Quote Originally Posted by fixed.rider
    Sometimes they get gooked up and will miss shifts like that. I have used carb cleaner (spray can variety) w/ a lot of success. Spray in, let sit a few mins, wipe off excess and shift away good as new. Spray triflow will also sometimes work.
    Good tip. I used wd40, but if that doesn't work, then a more powerful solvent makes sense.
    Il faut de l'audace, encore de l'audace, toujours de l'audace

    1980 3Rensho-- 1975 Raleigh Sprite 3spd
    1990s Raleigh M20 MTB--2007 Windsor Hour (track)
    1988 Ducati 750 F1

  5. #5
    Perineal Pressurized dobber's Avatar
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    Check where the cable runs under the bottom bracket, this spot is a catch-all for crap.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  6. #6
    Bike Junkie roccobike's Avatar
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    Quote Originally Posted by Al1943
    I would flush out the shifters really well with WD40. New shift cables and housings may also be needed. You could try lubricating the cable where it runs through the short housing just before the rear derailleur. Often this will improve shifting.

    Al
    I follow up the WD40 with a healthy spray of Finish Line Teflon Plus chainlube. That 1-2 combo has worked three out of three times for me. Save me and my freinds a lot of $$$ not having to replace brifters.
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