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Front Derailluer HELP!

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Front Derailluer HELP!

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Old 08-13-08, 10:33 PM
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thirtyminbreak
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Front Derailluer HELP!

My front derailluer will not change gears to the smaller cog.
I have spent a large portion of my day fixing my drivetrain and have had quite an improvement.

I kno there are alot of videos on youtube but I am not sure which path to take in this situation.
Do I loosen cable tension, raise derailleur(though I think it is about 3-4 mm from teeth), screw in or out little screws to close or spread distance of derailluer from bike...........

help.
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Old 08-13-08, 10:44 PM
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paul_858
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Check

1. cage parallel to chainrings?
2. Cage close enough to chain rings 3mm should suffice most of the time
3. Cable tension issue. drop the front derailleur to the lowest point via brifter, disconnect cable, pull taut, reattach, see if that works.

4. lack of cage travel

overtravel screws need to be adjust.
Disconnect the cable.
see how far the cage moves towards the seat tube. spin the cranks forward, does it shift down to the small ring? No? adjust the small screw (assuming shimano) back out the screw closest to the seat tube until the cage travels enough to allow it to shift down. Adjust so that in the small ring/big ring combo, there's not drag against the cage by the chain.

5. frozen front derailleur, pull off bike, soak in something to help disolve corrosion.

Last edited by paul_858; 08-13-08 at 11:19 PM.
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Old 08-13-08, 11:25 PM
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ridethecliche
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I have a quick question to add.

If you're in the big-big combo, is it normal to drop your chain if you shift down to the smaller chainring?
(There's very little clearance between my FD and chain on the 39-25, but I still drop my chain if I shift down from big big. I know the combo is a no no so it's a non issue, but I'm just curious. Thanks!)
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Old 08-13-08, 11:33 PM
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paul_858
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So you're going from big big to small big? it shouldn't, but then again that's not a shift you should be encountering. Shouldn't be in big big to begin with.

I'll try it in the morning and let you know if I have that issue with any of my bikes.
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Old 08-13-08, 11:49 PM
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Originally Posted by paul_858 View Post
Check

1. cage parallel to chainrings?
2. Cage close enough to chain rings 3mm should suffice most of the time
These are not indicators of a proper FD adjustment.

OP: Read this and do it: http://www.parktool.com/repair/readhowto.asp?id=75
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Old 08-13-08, 11:59 PM
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got it mostly fixed before i read your response.
only problem now is i cannot get to my largest cog(1st gear) in the rear. my shifter seems to get pushed back. cable issue?

also using smallest or 7th rear cog and smallest front cog i get a clicking sound. pretty sure that is just some front derailluer adjustment. maybe needs to be lower? seems chain has quite a bit of play
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Old 08-14-08, 12:01 AM
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Originally Posted by paul_858 View Post
So you're going from big big to small big? it shouldn't, but then again that's not a shift you should be encountering. Shouldn't be in big big to begin with.

I'll try it in the morning and let you know if I have that issue with any of my bikes.
yea i know i will never be in thaat situation. but i just want everything in it's best possible condition.

also it is fun getting to know more about my bike.
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Old 08-14-08, 08:12 AM
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ridethecliche
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Originally Posted by thirtyminbreak View Post
got it mostly fixed before i read your response.
only problem now is i cannot get to my largest cog(1st gear) in the rear. my shifter seems to get pushed back. cable issue?

also using smallest or 7th rear cog and smallest front cog i get a clicking sound. pretty sure that is just some front derailluer adjustment. maybe needs to be lower? seems chain has quite a bit of play
Sounds like a limit screw issue.
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