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  1. #1
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    Shimano 105 rear derailleur skipping a cog

    Hey..... i did some adjustments on rear derailleur and everything seemed to go well moving up but coming down its skips the 2nd cog next to the top one..... is this a cable issue?? any advice....

  2. #2
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    First we need to be clear on the semantics. Do you mean the 2nd largest sprocket, or the 2nd to top gear (or 2nd smallest).

    Also does it overshift on one click, then stay one click off the rest of the way, or does is not shift on one click, then go back to "normal" with a 2nd click slipping what should have been the firs shift?
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  3. #3
    Senior Member bikeman715's Avatar
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    It may not be a cable problem but more of a problem with the rear derailleur hanger . Have the hanger check or replace if it replaceable one .
    bikeman715

  4. #4
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    Quote Originally Posted by FBinNY View Post
    First we need to be clear on the semantics. Do you mean the 2nd largest sprocket, or the 2nd to top gear (or 2nd smallest).

    Also does it overshift on one click, then stay one click off the rest of the way, or does is not shift on one click, then go back to "normal" with a 2nd click slipping what should have been the firs shift?
    its the 2nd largest, it clicks all the way to the largest no problem, when I click it down it just passes right over the 2 nd largest and continues normally....this is a pretty new bike....it started shifting a bit funny i thought maybe the cable was stretching a bit so followed a tutorial on adjusting everything...so chances are I messed somethin up

  5. #5
    Senior Member Flyingblind9's Avatar
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    This is a video that I found to be particularly useful if you want to see how it is done. Maybe you might have missed something that this will help you catch. If the shifting is still poor I would also consider replacing your derailleur hanger as that is the only other thing that I can think of that can cause it to shift irregularly despite proper cable adjustment.

    How to Adjust Shimano Rear Derailleurs - YouTube

  6. #6
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    Since it is a new bike, you need to take it back to the dealer and have the mechanic explain the problem and how to fix it.

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