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How to adjust Tiagra front derailleur

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How to adjust Tiagra front derailleur

Old 07-16-13, 04:59 PM
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Long Tom
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How to adjust Tiagra front derailleur

My bike has 105 rear/ Tiagra front derailleurs, and the combo brakes/shifters (also Tiagra). It's from 2008. Stuff is working fine, with the exception being that the front derailleur won't reliably drop the chain onto to smallest front chain ring. I'm guessing this is a simple fix but thought I'd ask here before I started fiddling.

TIA!!
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Old 07-16-13, 05:27 PM
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Just happened to my 2013 Felt.
Mine had some gunk that had to get flushed out and all is fine.

With the bike on a rack, as you crank the pedals shift from the big to small. If it doesn't shift all the way see if you can push the derailleur body towards the small ring. If you can, it could be some gunk in the body of the derailleur, or your cable is getting hung up somewhere. There should be a little bit of give on the cable as opposed to the cable being taught when the derailleur is on the big ring.

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Old 07-16-13, 09:25 PM
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Tiagra is no different than any other front derailleur, adjusted the same way. See Parktool.com/blog or Sheldonbrown, follow the entire procedure, paying particular attention to height and rotation of the derailleur. There could be something caught in the derailleur, but frankly that's rare. There is no one cause for the problem you describe, so you need to make sure first that everything is adjusted to spec, and that the cable is moving smoothly. We also need to know if the problem started at any particular time, and if so any maintenance, replacement, accident, etc. that occurred just previous.
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There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

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Old 07-16-13, 10:30 PM
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you have a BD bike?
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Old 07-17-13, 02:12 AM
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Man, I could really use me a turbocharger!!



It was bought as a used bike, so I don't know the progression of symptoms (if any) to this point. I've put about 500 miles on it; this is my only issue.

I'll check out the suggested links above. On the face of it, I don't think it needs a full routine; I just need to adjust the limit screw a bit to let it swing further towards the small chain ring. I think.
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Old 07-17-13, 05:47 AM
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Originally Posted by Long Tom View Post
1. It was bought as a used bike, so I don't know the progression of symptoms (if any) to this point. I've put about 500 miles on it; this is my only issue.

2. On the face of it, I don't think it needs a full routine; I just need to adjust the limit screw a bit to let it swing further towards the small chain ring. I think.
1. I'm not clear on what buying it used has to do with it, unless the symptom has been there from the beginning. If it has not then the questions I asked are still relevant.

2. A full check is a standard suggestion, due to the fact that we don't know what you have tried or with what you are familiar. If you think it's just the limit screw then try that first. But if you want to make sure the derailleur is operating optimally in all respects then my previous advice stands.
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There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!
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Old 07-17-13, 07:07 AM
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This is a long shot, but just on the off chance that you are having the same issue that I did about a year ago:

The Tiagra from that time took a pretty good amount of extra trim to get to the top ring when shifting up. If you're like I was and you underestimated the amount of trim you'd be using, then you could very well have your cable tension set up too high to make getting into that top ring easier at the cost of dropping into the lowest.

Again, that's kinda a long shot, but if it sounds like it may fit, just loosen the cable a bit until you can drop into the bottom ring easily enough and trim up for the top when you need to.
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Old 07-17-13, 01:14 PM
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Originally Posted by cny-bikeman View Post
1. I'm not clear on what buying it used has to do with it, unless the symptom has been there from the beginning. If it has not then the questions I asked are still relevant.

2. A full check is a standard suggestion, due to the fact that we don't know what you have tried or with what you are familiar. If you think it's just the limit screw then try that first. But if you want to make sure the derailleur is operating optimally in all respects then my previous advice stands.
Sorry if my "1.... 2..." format came off as brusque. I didn't mean it that way. My bad.

What I was trying to say, in reaction to this:

"We also need to know if the problem started at any particular time, and if so any maintenance, replacement, accident, etc. that occurred just previous."

... is that I don't know nuthin' about none a' that <grin>. It was a little balky when I got it and has remained so. I've lubed it and checked for obvious detritus such as great green gobs of greasy grimy gopher guts, and there's not any. The mechanism does fine in all other respects; just seems to need to be able to move a tad further on the inboard end of it's travel. But that's my noob perspective.

It's funny. I deal with mechanical stuff all day long. Today I'm tearing into the Reeves drive on a milling machine to replace a worn spline bushing with one that I just made. But with my bike... I seem to lack the desire to tinker. I want my answer to be simple, neatly packaged, and require minimal brainpower on my part!

All the best, and thank you. I'll read up on the procedures you mentioned.
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