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Help adjusting front deraileur

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Help adjusting front deraileur

Old 10-20-16, 03:48 PM
  #1  
Hitbyataxicab
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Help adjusting front deraileur

Hi!

I am trying to adjust my front deraileur (Shimano 105; FD-5600). I am following this video:
. When I try to adjust the L screw so that the inner part of the front cage is 1mm off the chain, I cannot get the inner part of the cage even close to the inner aspect of the chain. This is with the shifter cable detached. What do I do? Thanks!
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Old 10-20-16, 04:00 PM
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JonathanGennick 
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Do you for sure have your chain on the inside cog on the rear? And also on the inside chain ring?

Can you confirm that what you think is the L-limit screw does, in fact, move the cage outward from the seatpost? Is the cage just not going far enough out?

Maybe post a photo?
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Old 10-20-16, 04:09 PM
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rmfnla
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Remove the cable.

Move the cage by hand and see how close it comes to the large ring.

Adjust the FD up or down as needed...
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Old 10-20-16, 04:17 PM
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FBinNY 
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I suspect that your problem may be related to not understanding the independent actions of the cable and limit screws.

Imagine an elevator. There are limit switches near the top and bottom of the shaft to make sure that the car can never over run the ends and crash. Meanwhile the actual position of the car on the various floors isn't determined by these, and instead depends on floor position controls.

Likewise the FD.

Using this logic, I never attach the cable before setting the lower limit. Once I have the lower limit adjusted so the inner cage just clears the chain in low, I set the lever to the low position and attach the cable, taking up not quite all the slack, and making sure that cable tension isn't lifting the FD off the stop.

Now, without using the lever, I shift the FD back abd forh, by pulling the bare wire away from the frame. I fine tune both limits only so tight that the chain can't overshift no matter how hard I try, and no tighter than that point (like the top and bottom switches of the elevator.

Once the limits are set, I'll check that shifting and trim are correct in both directions using the lever. If not, I know that the only issue is my cable length adjustment, and that's all I'll change to dial it all in.
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Old 10-20-16, 04:20 PM
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FBinNY the patience you exhibit in crafting your replies is admirable...
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Old 10-20-16, 10:43 PM
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FB's description and logic is perfect.

My advice is always: go to the manufacturer's instructions, or a reliable generic front derailleur instruction like Park.

Start at step 1. STEP 1, I SAY!

(Hint: You will have to disconnect the cable and remove the derailleur to actually start at step 1... yes, that is what I'm recommending).

Then go STEP by STEP, not skipping any step. Not missing an adjustment. Being careful to make sure you've got each step done properly before moving on.

You'll find (a) that you have a well installed and adjusted derailleur and (b) you understand even better everything written above by others. You'll understand height and angle adjustment, how to properly adjust limit stops, how to get cable tension right, and which order to do this stuff.

This will take you about 10 minutes, which is less time than you'll spend trying to adjust a derailleur if you don't have perfect understanding to identify pitfalls along the way. If you start at step 1, next time you'll probably be able to figure out what you need to do to correct a set up that's already in place.

Seriously, don't start with what you currently have, start at step 1.

8-)

Last edited by Camilo; 10-20-16 at 10:50 PM.
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Old 10-21-16, 07:08 AM
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Make certain that you do not leave excessive clearance when setting the low limit, or you may run out of derailleur throw on the high end. 1 or 2mm is plenty of clearance. Set it in low/low with the wire disconnected and don't touch it again.
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