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Squalor
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239 Posts
Discussion Starter · #1 ·
This is what is happening:

...Shift to bring ring and ride...approach a roller...up a gear in the rear and out of the saddle to climb...

When I do this and rock the bike back and forth out of the saddle, the FD drops a "trim" notch on its own and the FD cage rubs on the outer portion of the big ring. Almost like the FD has too strong of a spring.

FD cable is routed to the outside of the metal tab by the pinch bolt FWIW.

Any ideas?

Thanks

LP
 

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Squalor
Joined
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239 Posts
Discussion Starter · #3 ·
It only contacts the ring after the FD drops a "trim notch" unintentionally. When all the way out..no rub and all is well.

It's the unintentional dropping that I am not understanding.

LP
 

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Squalor
Joined
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239 Posts
Discussion Starter · #5 ·
kytyree said:
Your FD shouldn't hit the chainring at any time, it contacts the chain and nothing else.
Got it...it only rubs the chain which is on the big ring.

No shifting issues with chainring contact and all that....

LP
 

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10,160 Posts
cable tension...

lanpope said:
Got it...it only rubs the chain which is on the big ring.

No shifting issues with chainring contact and all that....

LP
You probably have the cable tension and big ring limit screw at little out of sync. Turn the screw CCW, 1/8 turn to move the cage further to the right. If the limit screw and cable tension are not matched, the shifter is probably not quite dropping fully into that last click.

Be sure that the thumb button was completely out of clicks when the cable was attached. It should take 4 clicks to cover the full range of travel. If you are using more, then the cable tension is too low and the first clcik of the finger lever is just taking up slack, not moving the cage to the right.
 
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