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shifting problems (shimano 105)

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  • February 12, 2017 at 7:46 pm #26774
    carl j

    Hi All

    Wonder if anyone can help.  Just bought a pair of second hand 105 shifters (quite old – 5600 series)

    Problem is with the 10 speed shifter – it changes down quite nicely, indexing from the highest gear to the lowest, however when I change up a gear, it simply drops to the highest gear.

    I’m wondering whether I’ve installed the cable correctly, or if it’s simply a dud.

    Anyone had any similar experieinces?

    Regards

     

    Carl

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Viewing 7 replies - 1 through 7 (of 7 total)
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  • February 15, 2017 at 1:10 pm #886939
    0
    FMOAB

    I agree that it sounds like a

    I agree that it sounds like a gummed up shifter.  Persevere with it, take it off the bike put it in a freezer bag and saturate it with GT85 and leave it like that for a few hours, shaking it occasionally and working the shifter.  That will probably do it.

    If that doesnt work put it in a bath of warm degreaser and agitate it as before.  I have the luxury of having an ultrasonic cleaner, which you can get for about £20, they are fantastic for sticking shifters, mechs brakes and even for OTT chain cleaning.  

    If you go the degreaser route, make sure you oil the shifter well afterwards, ideally with something containing PTFE. 

    February 14, 2017 at 3:49 pm #886937
    0
    The _Kaner

    upgrade to 5700 10 speed STIs

    upgrade to 5700 10 speed STIs…..Ive a new/(unused) set + cables/outers sitting here….

    February 13, 2017 at 11:34 pm #886935
    0
    dottigirl

    Maybe a blast of air then

    Maybe a blast of air then followed by GT85.

    I unwisely took mine along to local sand dunes when back in Wales. They’ve never worked the same since!

    February 13, 2017 at 11:00 pm #886933
    0
    Acm

    It sounds like the pawl isn’t
    It sounds like the pawl isn’t returning after you’ve released the shifter to stop the ratchet mechanism dumping all the gears. The only thing you can realistically do is to try wd40 or some degreaser to loosen is off. Those Shimano shifters don’t lend themselves to bring torn down (they’re not too hard to take apart but nigh on impossible to get back together), so if you can’t get it to free up with degreaser then it’s probably toast
    It might not be that the grease has clogged; it might just be a broken spring, which is also a massive pain to fix unfortunately

    February 13, 2017 at 9:58 pm #886931
    0
    carl j

    Cheers for your tips.

    Cheers for your tips.

    I’m going with the lubrication idea when I next get the chance.  I’ve read the older 105 shifters used a grease that is quite heavy and becomes cloyed over time.  At least that’s what I’m hoping.

    Just to clarify, it indexes nicely going from small cogs to big cogs (high to low in my mind), but when indexing from a big cog to a smaller one, it simply dumps itself into the smallest cog/highest gear.  I’m hoping it’s just a sticking pawl!!

    February 13, 2017 at 5:10 pm #886929
    0
    . .

    Are you saying it jumps from

    Are you saying it jumps from the biggest rear cog to the smallest in one go?  If so, I can only think the shifter is broken.  Perhaps give it a good internal spray with GT85 in case some grit is stuck in there.

    February 13, 2017 at 3:18 pm #886927
    0
    hoffbrandm

    Always get confused with

    Always get confused with different peoples interpretation of changing up, down, high and low…

    Used to have 105 and came across a modecum of problems over the couple years I used it/destroyed it. (I’m not nice to gears)

    My expirience is when changing to a smaller rear sprocket – loosening the gear cable.

    The issues I cam across were:

    – Lubrication of parts inside shifter because it was sticking.

    – Having too short a cable

    – Bent Hanger

    – Not indexing using the GCN video (https://www.youtube.com/watch?v=Bbk5RcH0bbQ) and general indexing lack of understanding.

     

    Hope that helps maybe?..

     

     

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