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Adjust gears 105

Old 08-28-17, 09:35 AM
  #1  
Bigbadjohn
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Adjust gears 105

I have just replaced the stem on my bike and now the rear gears do not shift properly

It used to be you pressed slightly on brifter to change to a higher gear, now you have to move lever all the way
the highest gear it will go to is third from highest. does this mean the cable needs shortening near rear derailleur
the screw is very stiff and the other screw on down tube won't move so I could undo Allen bolt on derailleur and do it that way?

I could take it to LBS but I would like to learn how to do it myself, I saw a few Youtubes but do not address this problem

Everything is 105
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Old 08-28-17, 10:46 AM
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Got to the Shimano website and download the deal manuals (DM) for whatever series 105 components you have. They may not be detailed enough for a first time bike DIY'r, but they help. Then youtube vids. But not everyone posting youtube vids has a clue to what they are talking about.

There shouldn't be any need to take the derailleur off. You are more likely to damage it when you put it back on if you don't pay attention to the little adjustment screw that has to clear the tab on the dropout.

If all you did was change the stem size a centimeter or two, then there may be some issue with where the cable housings go into the shifters.

Last edited by Iride01; 08-28-17 at 10:51 AM.
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Old 08-28-17, 10:47 AM
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Needs more cable tension for the FD. The way to do it varies by generation of your 105; my current Tiagra requires me to manually push the FD onto the big ring before pulling the cable taut to get sufficient cable tension for quick FD shifts.
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Old 08-28-17, 05:31 PM
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I was not going to take derailleur off just adjust cable there as it seems too long, I guess like everything else when you know how it's easy.

before I only moved brifter lever .25 inch to go into higher gear now it's a 1.25 so that must mean cable is too long

Last edited by Bigbadjohn; 08-28-17 at 08:03 PM.
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Old 08-28-17, 07:59 PM
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If you didn't move your shifters and only changed out the stem it seems weird that you would be having that problem. Google "adjusting rear derailleur". You'll find plenty of videos to walk you through setting it up properly.
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Old 08-29-17, 02:23 AM
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Park Tools is my go to website for working on bikes and they have excellent articles on this very subject. Give it a go. The worst that can happen is you'll make a mess of it and have a single speed to ride to the lbs to get it sorted out but the reality is, it's pretty easy and very satisfying.
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Old 08-29-17, 06:05 AM
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Originally Posted by Bigbadjohn View Post
I was not going to take derailleur off just adjust cable there as it seems too long, I guess like everything else when you know how it's easy.

before I only moved brifter lever .25 inch to go into higher gear now it's a 1.25 so that must mean cable is too long
No, the cable isn't any longer, though it may have slipped. What's confusing is that you refer to not being able to reach the "high" gears in back, which are the smaller cogs. That is done by releasing cable at the lever, so the spring on the derailleur can move it to a smaller cog. Pulling up slack in the cable would not fix such an issue going to a larger gear. Many people confuse high/low gears. Can you please tell us whether the problem is reaching larger or smaller cogs in the back?
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Last edited by cny-bikeman; 08-29-17 at 06:10 AM.
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