Help : Chain rubbing FD

Originally Posted by limerickman

...as an older ex-competitive cyclist, it is embarrasing
having to ask this but....

Originally Posted by gruppo

Well, imagine how I feel then. I have been riding and maintaining bikes for over 50 years, but I don't have an answer for you. It is obviously an adjustment problem, but you have already tried that.

Guess it is time to visit the LBS, assuming you can stand the embarrassment.

Originally Posted by limerickman

Well before doing so - maybe if you could list a few suggestions, you never know I might have missed something obvious.
Appreciate it - Lim

Originally Posted by meehs

It's weird that the chain rubs the FD in the middle ring. It's something that usually happens at the extremes in the big and small rings (as I'm sure you're aware. Does Mirage use an indexed front shifter so you can't "feather" the FD to eliminate the rubbing? Dumb question but are you sure the noise is from the chain rubbung the FD? Maybe it something to do with the 40 tooth ring itself? There are others here that will be better able to answer this than I am (boudreaux?). I don't have much experience with triples.

Originally Posted by limerickman

I've been in this game a long time and believe me it kills me
having to ask this question but I have no choice, I cannot come up with a solution.

I have come in to possession of a bike.
Bianchi San Remo to be exact.
It has Campy Mirage components,
30/40/50 crank, Shimano Acera cantis, Mavic MA-2 wheels.
13-29 rear cassette.

It is a good bike - good for touring.

I have one problem though - when I select 40x13-29, there is a
noise from the the guard on the front derailleur.
I have tried everything to adjust it so that the chain stops rubbing the
FD.
But still this noise 9rubbing noise) persists as soon as I select the 40.
There is no noise whatsoever when using the 50 and 30 : only the 40.

At my wits end.
Has anyone else come up against similar problems ?
(as an older ex-competitive cyclist, it is embarrasing
having to ask this but.........)

Originally Posted by boudreaux

Ya tried using the front shifter to trim it?

Originally Posted by limerickman

I checked the FD and it can't be feathered as you suggest.

Originally Posted by boudreaux

The feathering(trim) is in the shifter. It can be moved in small incerments to eliminate rub in any chainring.

Originally Posted by meehs

The 40 tooth ring isn't bent out of round is it?

Originally Posted by limerickman

Boudreaux, meehs, Gruppo - thanks for taking the time to reply.
I will being it to my LBS.

Older types like me want to think that we know everything about our bikes.
On this occasion I will concede.

merci

Originally Posted by meehs

No problem Lim. I don't know anything else to suggest anyway. I'm just as stumped as you are. Let us know what the problem turns-out to be if you have a chance.

Originally Posted by limerickman

Good question, Meehs.

I put the bike up on the stand and rotated the pedal and the chain appears
to slightly gaise the guard on the FD.
(it's only a slight sound when I rotate the pedals when the bike is on the stand - when rotate it while sitting on the bike, it is far louder as there is more force being applied than when I rotate the pedal with my hand).

I checked the FD and it can't be feathered as you suggest.
In fact I checked the front FD and it is aligned correctly (no sign of it being damaged in a crash)

Yes, normally if there is an issue with the chain rubbing the FD, it happens when you use the higher/lower chainring.
In my case it works perfectly - except when I shift in to the middle chainring.

This one has me stumped, Meehs.
But thanks for the suggestion - as I said it is probably something very obvious and I have simply missed it !