Shimano R8000 Front derailleur shifting Q?

Discuss light weight issues concerning road bikes & parts.
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Boshk
Posts: 345
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

Shifting up and down on the chainrings are fine, actually pretty smooth BUT shifting down does make one hell of a racket. Is that normal?

I'm pretty sure when I was running my campy Chorus FD, the downshift never made that much noise against the frame.
Hard to express in words and video doesn't show the noise echoing through the frame, the downshift from Large ring to small ring is....click, CLICK, SLAM....

Colnago C60

by Weenie


TheKaiser
Posts: 632
Joined: Thu Sep 05, 2013 3:29 pm

by TheKaiser

Boshk wrote:
Fri Sep 07, 2018 12:17 pm
Shifting up and down on the chainrings are fine, actually pretty smooth BUT shifting down does make one hell of a racket. Is that normal?

I'm pretty sure when I was running my campy Chorus FD, the downshift never made that much noise against the frame.
Hard to express in words and video doesn't show the noise echoing through the frame, the downshift from Large ring to small ring is....click, CLICK, SLAM....

Same frame? If not, then some frames do seem to resonate more than others. If so, then it could be a combo of both the strength of the spring in Shimano vs. Campy, and how their trim adjustments function. Not sure about your respective parts but some front shifters kind of shift down through one or more intermediate trim steps before hitting the innermost position, which prevents the derailleur from picking up so much momentum. Others that go all the way in one pop really do pick up a lot of speed.

Also, how much the derailleur is halted by the limit screw vs. cable tension can play a role. With looser cable tension, there is nothing to slow the spring driven push of the derailleur until it slams against the limit screw. With more cable tension, the increasing tension in the cable as the derailleur reaches the end of its range can give you a softer stop.

And lastly, in your vid you are not actually shifting the chain. Under normal riding conditions, the derailleur has to overcome the resistance and tension of the chain, which will also make the movement less violent.

In any event, assuming it shifts fine and is adjusted to spec, then I wouldn't worry about it.

Theologian
Posts: 46
Joined: Sat Jun 23, 2018 3:34 am

by Theologian

I just upgrade to r8000 groupset and mine does a similar thing. I wouldn't worry about it.

Boshk
Posts: 345
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

thanks guys
Colnago C60

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