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Ultegra Front derailleur driving me a little nuts

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Ultegra Front derailleur driving me a little nuts

Old 09-18-14, 09:36 PM
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Steve M.
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Ultegra Front derailleur driving me a little nuts

Dialing in a new build with an Ultegra 6600 double FD. It's a clamp-on with a plastic shim.

At rest -- with chain in the largest rear cog and the small front chainring, and with the cable unhooked -- the inner plate of the FD is 3-4 mm away from the chain even with the low limit screw turned all the way in.

(The low limit is the screw closest to the seat tube, right? And turning it clockwise should move it outboard, right?)

This seems not ideal. Frankly, I can't even tell that the screw adjusts the cage's position at all.

I'm thinking of swapping in a spare Tiagra FD just to see if that's any improvement. The RD and crank are 6700, if that should make any difference.

Anyone have any brilliant advice?

Thanks in advance,

Steve M.

Last edited by Steve M.; 09-18-14 at 09:52 PM.
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Old 09-19-14, 12:52 AM
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Your assumptions on the cage movement relative to limit screw adjustment are correct. Movement of the cage should be readily visible.

Check the FD height to be sure the cage is able to clear the outer ring. With the inner plate remaining 3-4mm distant from the chain, it sounds like the lower edge of the outer plate could be catching the teeth of the outer chainring.

Otherwise, is there something peculiar about the crankset and BB spindle that could cause the rings to be positioned too far outboard for the FD?
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Old 09-19-14, 05:04 AM
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No hangups on the chain ring. I checked for play in the BB spindle, but there's none. Maybe I should add some sort of spacer on that side to keep the crank a little farther outboard.
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Old 09-19-14, 05:52 AM
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Originally Posted by Steve M. View Post
Dialing in a new build...
Did you check chainline for the BB/crankset as well as for the front derailleur? You can't randomly choose BB and cranks - they have to be compatible with each other and the frame. Perhaps you have a 70mm BB shell and you installed a crankset designed for 68 or left out the required spacer?
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Last edited by cny-bikeman; 09-19-14 at 05:56 AM.
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Old 09-19-14, 06:40 AM
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I *knew* I shouldn't have knit my own bottom bracket!

It's a regular old 6600 HollowTech set up with a 68mm bracket shell. No spacers came with crank. The triple has spacers, but this is the double.
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Old 09-20-14, 07:14 AM
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And, as it is so often, the solution was something simple and overlooked: The low limit screw wasn't all the way in. Tinkering last night, I discovered that tugging the cage outboard just a little relieved the spring pressure and I could tighten it up and bring the cage right up on the chain, as Mr. Shimano intended.

Mystery solved!

Steve. M.
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Old 09-20-14, 08:34 AM
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It is best practice to always move the derailleur away from the limit screw, adjust and then move the derailleur back to the stop point.
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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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