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Front derailleur replacement - replacement advice for 22T capacity

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Front derailleur replacement - replacement advice for 22T capacity

Old 09-12-15, 06:33 PM
  #1  
Greg_R
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Front derailleur replacement - replacement advice for 22T capacity

I just had my second Shimano Tiagra FD-4403 front derailleur's casting break (there is a small nub for the spring and it breaks off... lot of other folks have had the same issue). This breakage is after 2 years of moderate use (plus regular maintenance). The previous one broke after 3 years. I'm convinced that this design is a lemon and am looking for an alternative that is durable. This is for a Surly LHT commuter/kid-hauler so weight is not a concern.

More details:
- The diameter of my downtube is 1 1/8".
- downtube diameter is 28.6mm
- Crankset is 48/36/26
- Existing FD uses a clamp style mount
- Currently setup as a bottom pull FD
- 9 speed cassette
- bar end shifters

Questions:
- It appears that the current Ultegra line has a 20T "maximum capacity" which I'm interpreting as the delta between my top and bottom gear. Does that mean it won't work?
- Shimano's current MTB lineup doesn't appear to support 48T rings so I'm stuck with road options?
- What Ebay options might exist to fit my needs?

Thanks in advance for any help you can provide!
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Old 09-12-15, 07:06 PM
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1- The Ult der might work well but could have some chain contact with the ft cage end cross piece when in the small/small. Or the inner cage plate might sit slightly higher off the middle ring when the chain's on the larger ring. Both issues are minor in my view
2- I haven't looked at the specs so can't say. But do know that plenty of low end bikes come with a 48T and a Shimano ft der still.
3- You'll have to search Ebay to find out the current offers there. Andy.
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Old 09-12-15, 07:36 PM
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Originally Posted by Andrew R Stewart View Post
1- The Ult der might work well but could have some chain contact with the ft cage end cross piece when in the small/small. Or the inner cage plate might sit slightly higher off the middle ring when the chain's on the larger ring. Both issues are minor in my view
2- I haven't looked at the specs so can't say. But do know that plenty of low end bikes come with a 48T and a Shimano ft der still.
3- You'll have to search Ebay to find out the current offers there. Andy.
Sounds like the Ult FD might work, I don't cross chain that severely .
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Old 09-12-15, 09:14 PM
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Alivio and lower groups still support 48T. I've conformed that the following ones are available for 48/36/26.

Alivo FD-M431
Acera FD-M390

These come in multiple variants so make sure you get the right one.

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Old 09-13-15, 08:03 AM
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Bar end shifters? Get and older mountain derailleur (XT, 735 or something) from the era before the mountain compact ruled the day and common gearing up front was something like 48/36/24. They're out there, and will probably work better than a tiagra or something that has a cage curvature for a 53t ring. I probably have one laying around if you can't find one on ebay. Robust things those old FDs, any you'll find, as long as the fasteners are all there, should be ready for years of service.

With STIs this wouldn't be an option as shimano has different pull ratios for mountain and road groups, but since your bar ends are friction for the front, you should be good to go.

E: like this one- Shimano Deore LX FD M565 3x8 Speed Front Deraillure Bottom Pull Clamp 28 6mm | eBay
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Old 09-13-15, 09:53 AM
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I'm going to guess that it's mostly in the shifter. If you have a bar end shifter I'd stick on whatever you are comfortable with. If you're using STI shifters, you'll need a road bike derailleur so I'd try the Ultegra. Most of those derailleur specs seem to be pretty conservative so I'm about 90% confident it would work. I'd have no concern whatever about little/little performance or even slack take up because I only use my granny chainring with the largest 2 or 3 rear cogs.

My newest recumbent bike has only a 20 inch rear wheel so I have a 60/50/39 triple crankset that shifts perfectly with an older (1995) XTR front derailleur and a bar end (friction) shifter.
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Old 09-13-15, 10:34 AM
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Alpina-D Front Derailleurs
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Old 09-13-15, 11:45 AM
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Thanks everyone, I went with an older Deore LX that was in excellent condition.
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