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front deraileur not working using shifters

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front deraileur not working using shifters

Old 09-30-14, 09:44 AM
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front deraileur not working using shifters

Hi,
I removed the front derailleur(sram apex) on my road bike and when I put it back, I am not able to have it shift using shifters. But if I pull the cable running under tube by hand it shifts. I tightened the cable a bit more but it stil does not shift. Again, if I pull the cables hard by hand it does shift. I can see that when I press the shifters, it is pulling the cables to cause the shift, but I do not think that is sufficient for the derailleur to move. Any suggestions in how I can fix it myself?? Thank you.
Thank you.
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Old 09-30-14, 09:51 AM
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I'll go simple--is the left shift lever still shifted all the way "up" to the big ring?

Is anything pinching the front derailleur cable?
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Old 09-30-14, 10:12 AM
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Originally Posted by gamby
I'll go simple--is the left shift lever still shifted all the way "up" to the big ring?

Is anything pinching the front derailleur cable?
How would I tell if the shifter gear is on the big ring or small?? At this point the chain is in the smalllest cog and the derailleur is over the small chain ring. When I pull the cable by hand, I can see that the derailleur moves to right and shifts the chain on the big ring and if I release the cable, it will go back over to the small ring.

Thank you.
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Old 09-30-14, 11:28 AM
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Sounds like what the first reply was getting to (likely correct) is that you had the shifter in the big-ring setting, and while I don't know SRAM if it's anything like Shimano that shifter won't downshift to the small-ring without tension against it. Here is a short version of the Shimano processes, which at least for a front derailleur are probably similar.

1) Loosen the cable from the front derailleur (FD).
2) Pull the cable tight by hand, and while holding tension downshift the left shifter. <--this is likely the problem in the process you performed.
3) If you need any adjustments to the low-limit setting of the FD, do this without the cable attached.
4) Attach the cable with enough tension to keep the cable tight, though not necessarily moving the FD. If you have an in-line cable adjuster, you'll want to loosen that all the way before attaching the cable.
5) Now you should be able to shift. You'll probably need to tighten up the in-line adjuster a little to take up a little slack and get full movement, and then do your fine tuning from there.
6) Do any required adjustment to the high-limit setting.
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Old 09-30-14, 11:35 AM
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Sounds like a simple case of too much slack in the cable. set the shifter to the inner chainring position, and pull out ALL the slack. Tighten fixing bolt and try again.

Sometimes it's difficult to pull the cable tight enough, so what I do, is jam a pencil into the FD to hold it out toward the high gear position. When I then pull out as much slack I can remove the pencil and it'll drop back with zero slack in the wire.
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Old 09-30-14, 01:11 PM
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Originally Posted by Skoduri
How would I tell if the shifter gear is on the big ring or small?? At this point the chain is in the smalllest cog and the derailleur is over the small chain ring. When I pull the cable by hand, I can see that the derailleur moves to right and shifts the chain on the big ring and if I release the cable, it will go back over to the small ring.

Thank you.
Yeah, you likely disassembled it with the lever set for the large ring. Follow the instructions to get it back to the small ring position. On the other hand it could be you are simply not putting enough tension on the cable when the attach it to the derailleur. That has happened to me beaucoup times.
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Old 09-30-14, 01:35 PM
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Originally Posted by rpenmanparker
Yeah, you likely disassembled it with the lever set for the large ring. Follow the instructions to get it back to the small ring position. On the other hand it could be you are simply not putting enough tension on the cable when the attach it to the derailleur. That has happened to me beaucoup times.
I believe it is the loose cable friction but I thought I pulled as much I can.
Is there any tool you would use to do this. I used plyer to pull the cable. Not sure if bare hands can pull that tight.
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Old 09-30-14, 05:01 PM
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Originally Posted by Skoduri
I believe it is the loose cable friction but I thought I pulled as much I can.
Is there any tool you would use to do this. I used plyer to pull the cable. Not sure if bare hands can pull that tight.
yes, there's a tool. it's called a 4th hand
and costs anywhere from the teens to $50.00, but you shouldn't need to spend over $25 or so max.

However, you can do without, if you use the trick I described earlier, holding the FD cage out with a pencil jammed into the works. Doing it that way, you don't have to pull the cable super tight, since it's tighten when you remove the pencil and let it move back in.
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