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Old 11-02-06, 08:58 AM   #1
Artmo
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FD stuck on outer ring

My 105 STI front shifter has stuck on the outer ring. When I press the small lever, it won't click and allow the FD to shift back to the inner chainring. It was working fine for 20 mi this morning, but when I got to the end of the ride, it stuck. Any suggestions to fix it? Thanks.
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Old 11-02-06, 09:33 AM   #2
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[QUOTE=Artmo]My 105 STI front shifter has stuck on the outer ring. When I press the small lever, it won't click and allow the FD to shift back to the inner chainring. QUOTE]


I always thought on STI front derailleurs you pressed in the small lever behind the brake lever which upshifted to the big ring. Then to shift back to the small ring you pressed in the left brake lever. If that dont work you need to verify the FD is not seized or in some kind of bind. Loosen the cable from the FD and remove it, then manually operate the derailleur to see if its working right. If it is, then the cable has either stretched or is broke, or the shifter mechanism is gummed up inside the brifter.

Try shooting the brifter mechanism and cable real good with some WD-40. It may just needs to be cleaned out.
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Old 11-02-06, 09:36 AM   #3
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Spray some strong solvent (carburator cleaner, etc.) into the shifter while pressing the downshift button. Get it flushed out real good. As it gets clean, it should start working again. I've done it a few times and it has always worked. You may have to do it more than once. Once it's working good, hit it with teflon lubricant to keep it working well.
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Old 11-02-06, 11:02 AM   #4
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[QUOTE=Wino Ryder]


I always thought on STI front derailleurs you pressed in the small lever behind the brake lever which upshifted to the big ring. Then to shift back to the small ring you pressed in the left brake lever. If that dont work you need to verify the FD is not seized or in some kind of bind. Loosen the cable from the FD and remove it, then manually operate the derailleur to see if its working right. If it is, then the cable has either stretched or is broke, or the shifter mechanism is gummed up inside the brifter.

QUOTE]

You got the shifting wrong in your head, but I like your solution, I usually disconnect the cable to make sure it is not a cable routing problem before I go and spray junk into my shifter that could potentially collect more dirst later.
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Old 11-02-06, 11:27 AM   #5
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Yeah it could be a problem with the cable or cable housing but I've always had good luck with hosing out the inside of the shifters with WD40, use plenty. As you know, it is the small lever that shifts to the inner ring. If you haven't replaced the shift cables and housings within a couple of years this could make a big improvement in shifting performance, but try the WD40 first.

Al
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Old 11-02-06, 01:31 PM   #6
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Big lever to shift to larger ring or cog, small lever to shift to smaller ring or cog.
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Old 11-02-06, 04:39 PM   #7
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Quote:
Originally Posted by Troublegum
QUOTE]

You got the shifting wrong in your head, but I like your solution, I usually disconnect the cable to make sure it is not a cable routing problem before I go and spray junk into my shifter that could potentially collect more dirst later.



No actually I dont, but then of course I'm relating to the old first generation Shimano '600' STI that was on my bike. The left inner lever shifted to the big ring, while the left brake lever shifted it back to the smaller ring. And the WD-40 solution was recommended by many riders in the know as a possible "fix" for gummed up, unresponsive brifter shifting. So I would'nt necessarily call that junk.
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Old 11-02-06, 08:36 PM   #8
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Thanks everyone. I released the cable and was then able to operate the levers. I reconnected the cable and it's OK now. The bike is quite new, so I didn't douse it with WD40, but I will spray some silicone lubricant into the brifters.
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Old 11-03-06, 12:57 PM   #9
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With index shifting, pressing one lever part way engages the lockout for the other lever. To clear it, complete the stroke on the first lever.

I don't recall having this happen on the big ring, though.
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Old 11-03-06, 01:22 PM   #10
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Quote:
Originally Posted by DMF
With index shifting, pressing one lever part way engages the lockout for the other lever. To clear it, complete the stroke on the first lever.

I don't recall having this happen on the big ring, though.
Neither lever would move, but it's OK now.
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Old 11-03-06, 01:27 PM   #11
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Hey artmo, I'm having the same issue.

How exactly do you disconnect the cables?
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Old 11-03-06, 04:19 PM   #12
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Quote:
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Hey artmo, I'm having the same issue.

How exactly do you disconnect the cables?
At the front derailleur (FD), undo the bolt which clamps the cable. If the FD cage can then be moved easily from side to side, the problem is in the lever/brifter. In my case, when I loosened the clamp bolt, I was able to move the levers. I guess my cable was a bit too tight in the first place.
If this fixes your problem, turn the barrel adjuster on the FD cable on the down tube fully clockwise and then unscrew it half a turn; put the chain onto the smallest chain ring (front) and pull the cable tightly through the cable clamp and tighten the bolt. Try changing gear with the FD. It should change smoothly across all chainrings. If not, turn the barrel adjuster a quarter turn anticlockwise to tighten the cable. Repeat until you are happy with the gear changes. Fine tune while riding. If you run out of adjustment on the barrel adjuster, you will have to pull the cable tighter at the FD and reclamp it. Hope this helps.
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