Strange Front Derailleur (Tiagra STI) Problem ... won't stay in big ring
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Strange Front Derailleur (Tiagra STI) Problem ... won't stay in big ring
I recently bought a lightly used, 2009 Scott CX Comp (Cyclocross) with Tiagra STI levers and a Tiagra (double) Front Derailleur. When I first got it, the front derailleur was a bit sticky when going from the large to the small ring, but I could shift between both rings.
After a few rides, I'm no longer able to shift it into the big ring. I can get the chain into the large ring, but it doesn't lock into place. It just falls back into the small ring when I let go of the shift lever. I did some experiments with cable tension by disconnecting the cable from the derailleur and holding it in my hand. When I apply very light tension, the shift lever will lock into place, but if I apply just enough tension onto the cable I get the same effect ... the lever pulls the cable but it doesn't lock into place. I tried loosening the cable on the front derailleur, but if I apply enough tension to get it into the large ring, there's so much tension that the chain goes back into the small ring. If I loosen the cable too much, it won't even go into the large ring.
I'm assuming it's either caused by an overly tight front derailleur or a problem with the front STI lever. The front derailleur seems a little stiffer than the ultegra derailleur on my road bike, but it doesn't seem outrageous. Any thoughts on something else I should check? I have an old Ultegra left shifter lying around (I bought a used pair when my road bike rear shifter broke). Should that work with a Tiagra front derailleur?
After a few rides, I'm no longer able to shift it into the big ring. I can get the chain into the large ring, but it doesn't lock into place. It just falls back into the small ring when I let go of the shift lever. I did some experiments with cable tension by disconnecting the cable from the derailleur and holding it in my hand. When I apply very light tension, the shift lever will lock into place, but if I apply just enough tension onto the cable I get the same effect ... the lever pulls the cable but it doesn't lock into place. I tried loosening the cable on the front derailleur, but if I apply enough tension to get it into the large ring, there's so much tension that the chain goes back into the small ring. If I loosen the cable too much, it won't even go into the large ring.
I'm assuming it's either caused by an overly tight front derailleur or a problem with the front STI lever. The front derailleur seems a little stiffer than the ultegra derailleur on my road bike, but it doesn't seem outrageous. Any thoughts on something else I should check? I have an old Ultegra left shifter lying around (I bought a used pair when my road bike rear shifter broke). Should that work with a Tiagra front derailleur?
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It's a lever problem, not a derailleur problem. The engagement in the lever is worn or gummed up with dried lube. It may be toast, but before you quit, drown it in your favorite solvent to clean and flush it, work it back and forth and see if the latching gets more positive. If so, you're in luck, clean it out, and apply some light oil and keep your fingers crossed.
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It's a lever problem, not a derailleur problem. The engagement in the lever is worn or gummed up with dried lube. It may be toast, but before you quit, drown it in your favorite solvent to clean and flush it, work it back and forth and see if the latching gets more positive. If so, you're in luck, clean it out, and apply some light oil and keep your fingers crossed.
alanturing: The following pictures are for a mountain bike and a rear derailer but it works the same. Shift the front derailer into the largest gear while pedaling.
Once the derailer is centered over the large ring, shift into the lowest gear on the front without pedaling.
This will release tension on the cable and allow you to pull the housing out of the frame and the shifter so that you can inspect the housing.
Look for stray wires coming out of the housing ferule which indicate the outer cable needs to be replaced.
The above method can be used for lubricating the cables too.
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If you could send us a picture of the front derailleur it may help us resolve the issue. We are going to be taking shots in the dark here. It may just be that the front derailleur is too high (2-3mm above the large ring is suggested) or maybe rotated (not flush/parallel with the rings). Its probably a tuning problem, it takes a while to get good doing front derailleur setups. I doubt a 2009 setup has gone "bad" this quickly, probably just cable stretch.
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You have described exactly what my left 105 lever did as well. I soaked and lubed it with no change.
A new shifter with the same cable/housing/derailleur restored the front shifting in my case.
A new shifter with the same cable/housing/derailleur restored the front shifting in my case.
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If you could send us a picture of the front derailleur it may help us resolve the issue. We are going to be taking shots in the dark here. It may just be that the front derailleur is too high (2-3mm above the large ring is suggested) or maybe rotated (not flush/parallel with the rings). Its probably a tuning problem, it takes a while to get good doing front derailleur setups. I doubt a 2009 setup has gone "bad" this quickly, probably just cable stretch.
Thanks
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I would first try shooting the shifter full of WD 40.
From the last photo it appears that the rear end of the derailleur is out too far. If you agree, try loosening the derailleur and rotating the rear toward the frame slightly. I believe the derailleur is at the correct height. Or if it appears bent you could try reshaping it in place with your hands.
From the last photo it appears that the rear end of the derailleur is out too far. If you agree, try loosening the derailleur and rotating the rear toward the frame slightly. I believe the derailleur is at the correct height. Or if it appears bent you could try reshaping it in place with your hands.
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That all looks good, maybe could be closer to the rings a little bit (lowered). Have you also made sure that the limit screws are not in too far limiting how far out it goes? Maybe they are not bottoming out too early and not allowing you to "click" or what you called "lock into place".
Last edited by greyghost_6; 03-29-11 at 12:41 AM.
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I would first try shooting the shifter full of WD 40.
From the last photo it appears that the rear end of the derailleur is out too far. If you agree, try loosening the derailleur and rotating the rear toward the frame slightly. I believe the derailleur is at the correct height. Or if it appears bent you could try reshaping it in place with your hands.
From the last photo it appears that the rear end of the derailleur is out too far. If you agree, try loosening the derailleur and rotating the rear toward the frame slightly. I believe the derailleur is at the correct height. Or if it appears bent you could try reshaping it in place with your hands.
Nice clean chain there, alanturing. Big
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After a few rides, I'm no longer able to shift it into the big ring. I can get the chain into the large ring, but it doesn't lock into place. It just falls back into the small ring when I let go of the shift lever. I did some experiments with cable tension by disconnecting the cable from the derailleur and holding it in my hand. When I apply very light tension, the shift lever will lock into place, but if I apply just enough tension onto the cable I get the same effect ... the lever pulls the cable but it doesn't lock into place.
The first rule of diagnostics in medicine or mechanics is the suspected problem must reflect the symptoms. The problem described is failure to latch securely into position against the FD return spring. The latching occurs in the lever and nowhere else, ergo the problem must be in the lever mechanism.
Let's apply Ockham's Razor and consider the possibilities raised.
So we're back to the lever, which is the simplest theory which fits the symptoms as described. Either the latching mechanism is dirty, rusty or clogged with dried grease and will respond to flushing, or a pawl or detent is damaged and weakened in which the OP is SOL and needs a new lever as these are not considered repairable.
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Last edited by FBinNY; 03-29-11 at 10:49 AM.
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The first rule of diagnostics in medicine or mechanics is the suspected problem must reflect the symptoms. The problem described is failure to latch securely into position against the FD return spring. The latching occurs in the lever and nowhere else, ergo the problem must be in the lever mechanism.
At the very least, it's worth looking into before you go replacing the shifters.
An overly tight outer limit could cause the same effect by unduly raising the required latching force, but I rule it out because that can't happen over time (limits and cables don't magically get tighter). Also an overly tight limit would make the upshift difficult difficult and OP doesn't report this.
It can't be the FD itself because it does shift but won't stay there. FD issues effect the shift itself not the retention of position afterward. Also it used to work, and for the problem to manifest as described the FD return spring would need to have suddenly gotten too strong for the lever's latch, something beyond unlikely.
So we're back to the lever, which is the simplest theory which fits the symptoms as described. Either the latching mechanism is dirty, rusty or clogged with dried grease and will respond to flushing, or a pawl or detent is damaged and weakened in which the OP is SOL and needs a new lever as these are not considered repairable.
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Read the original description of the symptoms. It shifts fine, but won't stay shifted. Unless he has magic cables that are stiff enough to allow a shift and then somehow get too tired and stretch or sag immediately afterward it's not likely cable related.
I'm all for doing the cheapest thing first, and replacing cables is often a good place to start, but this case doesn't fit the description of a cable related problem.
He has a latching problem, the simplest theory is that he has a problem with the latch.
If my front gate keeps swinging open, I check the latch, not the hinge or the rest of the fence.
BTW- the suggested flush and re-lube of the levers (with fingers crossed) is the easiest, least expensive remedy, costing far less than a set of cables.
I'm all for doing the cheapest thing first, and replacing cables is often a good place to start, but this case doesn't fit the description of a cable related problem.
He has a latching problem, the simplest theory is that he has a problem with the latch.
If my front gate keeps swinging open, I check the latch, not the hinge or the rest of the fence.
BTW- the suggested flush and re-lube of the levers (with fingers crossed) is the easiest, least expensive remedy, costing far less than a set of cables.
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Last edited by FBinNY; 03-29-11 at 11:45 AM.
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I've thought of something else the OP could try.
The Tiagra shifters are double/triple compatible and the crankset is a double. There is more than one way to setup these shifters to work with a double crankset. The standard setup is to have all of the cable out of the shifter when the derailleur is in the inside ring position. Another way to set it up is to shift up one full position before attaching the derailleur. I think this would make the big ring position the same as it would be for a triple. "I think" because I haven't done this myself but it has been discussed on this forum by others. Most Shimano triple shifters have 4 main positions for the 3 rings, plus an extra trim position for the smallest chainring. Of course it's possible that this shifter may already be set up this way, if so the OP could try the standard setup as an alternative.
It seems that Shimano is phasing out their double/triple compatible shifters. First it was Ultegra, then 105 that changed to double or triple specific shifters. Dura-Ace has always been double or triple specific.
But first I would try the WD40 flush, it can't hurt anything and it may help a lot.
The Tiagra shifters are double/triple compatible and the crankset is a double. There is more than one way to setup these shifters to work with a double crankset. The standard setup is to have all of the cable out of the shifter when the derailleur is in the inside ring position. Another way to set it up is to shift up one full position before attaching the derailleur. I think this would make the big ring position the same as it would be for a triple. "I think" because I haven't done this myself but it has been discussed on this forum by others. Most Shimano triple shifters have 4 main positions for the 3 rings, plus an extra trim position for the smallest chainring. Of course it's possible that this shifter may already be set up this way, if so the OP could try the standard setup as an alternative.
It seems that Shimano is phasing out their double/triple compatible shifters. First it was Ultegra, then 105 that changed to double or triple specific shifters. Dura-Ace has always been double or triple specific.
But first I would try the WD40 flush, it can't hurt anything and it may help a lot.
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Yes, I've read his original description. I've had exactly the same problem. The outer housing is a bundle of rods. I've had one or a few of the rods break loose from the plastic around them and slide. If you put tension on the outer housing and the shift will be made but it won't stay there because the rods move and allow it to shift back. Some of the rods even came out of the housing ferrule. The rods put friction on the inner cable but, as they relax and move, they allow the cable to go back to a nontensioned state and the chain comes off the chainwheel. In extreme cases, the outer wall of the cable housing will rupture.
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#16
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This conversation was very helpful to me. I see that it is old so I am glad that it was in the archives. My specific problem was that my chain could shift to the large ring but when I released the shifter the front derailleur would move a bit inward which caused the chain to move back to the small ring. I was not able to get the front derailleur to stay in position to maintain the chain on the large ring. I used WD-40 as a degreaser in the shifter. I worked the shifter several times for about 15 - 20 minutes and it eventually worked. Eventually I heard a "ping" from the cable releasing and then I found a lot slack in the cable so I opened the pinch bolt, tightened the cable and restarted the process of tuning the cable tension, and setting the L & H limit screws for the small and large rings. Now I am back to a fully functioning bike. I am not the bike mechanic that you all are so your comments were very helpful in enabling me to figure this out.
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By the way, I used the chain lube as the lube in the shifter when I was done degreasing it. My chain lube is parafin wax solution with mineral spirits. I would appreciate your comments about that as an appropriate lube for the shifter. If there is a better alternative please make the suggestions.
Thanks.
Thanks.
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By the way, I used the chain lube as the lube in the shifter when I was done degreasing it. My chain lube is parafin wax solution with mineral spirits. I would appreciate your comments about that as an appropriate lube for the shifter. If there is a better alternative please make the suggestions.
Thanks.
Thanks.
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This is what I would do.
1. Remove tension from the front derailleur by releasing the cable.
2. Check the limit screws on the derailleur when getting in the highest gear.
3. Check the cable and cable housing for resistance by sliding cable and housing
4. Check the shifter to make sure the clicks are engaging with no cable load.
5. Simulate cable load with hand and check shifter clicks
Go from there.
if #2 , #3 and #4 are good then it sounds like the shifter needs a service or replacing.
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1. Remove tension from the front derailleur by releasing the cable.
2. Check the limit screws on the derailleur when getting in the highest gear.
3. Check the cable and cable housing for resistance by sliding cable and housing
4. Check the shifter to make sure the clicks are engaging with no cable load.
5. Simulate cable load with hand and check shifter clicks
Go from there.
if #2 , #3 and #4 are good then it sounds like the shifter needs a service or replacing.
- james
www.buckyrides.com
https://www.etsy.com/shop/Buckyrides
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Lube for shifter = triflow, light oil but nothing with wax in it.
- james
- james
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https://www.etsy.com/shop/Buckyrides
- james
- james
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This is a 9 year old resurrected thread. There have been 3 generations of Tiagra components that have come out since then. Fixes for problems of Tiagra components that worked back then may no longer apply