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I have an Acera front derailleur, the bracket of which has become loose so it isn't shifting well. I don't know if a washer has come off, or what it is supposed to be like when the metal bracket which pushes the chain is tight--there seems to be something missing on the "rivet" which now has a gap in it so that the bracket wiggles on the rivet in the frame. Is there an easy way to repair this, or do I need a new derailleur? thanks for your help. Mark

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I would take it to a dealer before you some damage, without seeing it, it is hard to diagnose. It may just need a spacer.

Posted on Sep 10, 2010

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Dura Ace di2 front derailleur 10 speed (7970) not shifting correctly. Moving back and forth with clicking sound. How do we fix?


First, is cable tight, it may be that the cable has loosened or stretched. In this case, Put chain on inside spocket, loosen hex head bolt, pull tight, retighten hex head.
It also could be the limit screws have vibrated loose. There are two of them on the top of the derailleur. Make small adjustments in one screw, check to see if it improves shifting or makes it worse. You didn't say whether it was the small or larger spocket. The limit screws control how far in or out the derailleur moves. Read more on Shelton brown .com under derailleur heading

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The front derailer on my sram red compact just wont change quick!


Which brand of shifters are you using? A SRAM derailleur won't work with Shimano shifters and vice-versa.

So - first; if you are using SRAM shifters with the Red derailleur - then changing to Shimano will not solve your issue but only make it worse.

If however you have Shimano shifters - then this is a good solution.
The Red derailleur should not shift that poorly with SRAM shifters. It is not the best - but it's not bad. If I had the bike in a repair stand I would be looking carefully at the following after affirming that the shifting system was indeed all SRAM:


  • Derailleur cage height relative to the large chanring - should be a maximum of 2 mm
  • Derailleur cage should be aligned as close to parallel to the rings as possible
  • Derailleur upper and lower limit screws should be adjusted within spec and in order to allow the derailleur to travel the correct amount for ideal shifting
  • Derailleur cable tension should be correct.


Hope this helps... Let me know if you need more.

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I have Campy mirage 10 sp and the rear deraileur shifter ( the right shifter) will skip gears while shifting down 23 to 11. Often I can hear the mechanism making multiple "clicks" on a single...


I would lube everything and check the derailleur adjustments and cable tension. Some Campy chains are 'notchy/clunky' all the time. It's just the way they are. If the bike is low mileage most likely nothing major is wrong. Check the derailleur hanger too just in case you dropped the bike and bent it or something. The shifter 'G' springs will wear out before the derailleur. When the springs are worn, the shifts will be imprecise and will jump from gear to gear without shifting. One thing with Campy stuff...it DOES take awhile to break in. Unless the shifting is horribly off, I wouldn't worry about it - just ride it more - and see what happens. Mirage is a good product, I think inline with Shimano 105 stuff.

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1 Answer

I've disassembled my acera rear derailleur and have forgotten which cog/sprocket goes where. One of them has an offset. What are the symptoms if I have them interchanged? TThanks Allan L


Generally there is no much difference, but as I remember in acera they have different sizes: the bigger one goes to the bottom (down), smaller one goes up.
As for offset you'll just have to readjust your rear derailleur. (If you disassembled it you'll have to readjust it anyway so no big deal)

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1 have a mid 90's bike with a Shimano Acera X that will not shift


My solution on the same shifters was to lube the grippers on the levers, they did not engage but after moving them around and lubing they started to grip and problem fixed.

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Adjust Shimano Acera back derailleur


There is a limit screw on the body of the derailleur that you have to back out slightly. You can tell which one of the two it is by watching carefully as you adjust it. It takes a phillips screwdriver.

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Shimano 105. Front derailleur won't shift down


It sounds like you could have two different problems. Your derailleur has become contaminated or your shifter may need to be lubed. Either way, the likely solution is the same. The best solution to get the derailleur operating again is to spray it with GT-85 or PB blaster and manually move in back and furth until it is working again. The same goes for the 105 shifter, spray GT-85 inside the shifter by compressing the brake lever and spraying towards the head of the shift cable. This will solve a non-functioning shifter many times.

The only other problem that fits is the limit screws could be wrong or the deraileur is in the wrong position. This would not be the case unless someone adjusted your derailleur before the ride you started have that problem. Or if the derailleur has moved. Both of which require the derailleur to be fully readjusted.

Hope this helps. Thank you

Jul 15, 2009 | Shimano 105 Triple Braze On Front...

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