Front derailleur clamp clashing with gear wire
I've just installed a 105 front derailleur in my cyclocross. The derailleur came without a clamp, so I bought this one one separately.
The clamp fits perfectly the derailleur and frame. However, this is a down pull derailleur with a pulley, and the cable going down along the vertical frame tube is clashing with the clamp. The clamp is just a little on the way, so it works, but it deviates the wire a little bit and I'm afraid with time it will cause problems - both the cable and the clamp will wear out. Comparing this clamp with the derailleur I had previously, the brace has a much higher profile, therefore the clash. As a quick fix, I was thinking about adding a small piece of cable housing, or a deflector, fixed to the clamp, so that the cable doesn't rub against the clamp directly. But I'm not sure how to fix the problem properly. Is this clamp wrong (too high profile)? I can't see of any other way to install it to have enough clearance. https://cimg6.ibsrv.net/gimg/bikefor...65835b29d0.jpg Top view, clamp on the way above the pulley. https://cimg7.ibsrv.net/gimg/bikefor...203d161e3f.jpg Smallest angle I could fit was passing the wire inside the clamp. |
I wouldn’t bother with preventing any rub, provided the shifting performs acceptably. Any wearing of the clamp from the cable would take many many years, I suspect. |
Ditto frankenmike, the mud and snow from cyclocross will make that invisible in the first hundred meters of riding. It will be years before the
clamp will be compromised and if the cable is stainless it will wear out in the brifter first. If you liked the FD in the long lever arm configuration (5800 IIRC) you will not be impressed with the 7000 series re-imagining. From another POV, consider how well the plastic cable guide on the bottom of the BB shell through which the FD cable runs holds up. |
Thanks for the replies with your opinions.
Pictures added above. Shifter is properly tuned and working fine, so I don't think it is any installation problem. I guess only way would be to find a clamp with narrow profile. However:
Originally Posted by frankenmike
(Post 20865811)
I wouldn’t bother with preventing any rub, provided the shifting performs acceptably. Any wearing of the clamp from the cable would take many many years, I suspect.
Originally Posted by sch
(Post 20865838)
From another POV, consider how well the plastic cable guide on the bottom of the BB shell through which the FD cable runs holds up.
That said, as it stands now, to add a cable housing I would have to disassemble and re-terminate the cable, so not worth it. So maybe I'll try to fit a plastic cable guide to reduce friction, if I find something that fits well, it's quick and simple. Otherwise I'll just leave it and see how it goes. |
Tried running the cable down the other way? ..pulling around the pulley, right to left ... then to the FD..
avoids the FD Clamp bolt entirely .. You could shop for a top pull front derailleur , and not need the redirect pulley. .... |
It might be feasible to use a spacer in between the frame boss & pulley to offset the pulley out in order to shift out the cable positioning clearing the clamp from the outer side.
|
Can't the cable run outside the clamp, or am i missing something?
|
You can avoid the pulley and clamp altogether by adding a length of housing between the last stop on the frame and the cable anchor. It should be long enough to allow full travel of the derailleur plus some slack. Your cable will stay much cleaner.
|
Originally Posted by fietsbob
(Post 20866246)
Tried running the cable down the other way? ..pulling around the pulley, right to left ... then to the FD..
avoids the FD Clamp bolt entirely .. .... |
Originally Posted by frankenmike
(Post 20865811)
I wouldn’t bother with preventing any rub, provided the shifting performs acceptably. Any wearing of the clamp from the cable would take many many years, I suspect. |
Originally Posted by le mans
(Post 20866276)
Can't the cable run outside the clamp, or am i missing something?
|
40 years ago cables went bare into unlined housing , then they figured out a plastic tubing inside the housing reduced friction a Bit..
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There are top pull derailleurs.
Look at the CX70 derailleur. http://www.bikepacking.net/wp/wp-con...12/05/cx70.jpg |
Originally Posted by trailangel
(Post 20866584)
Same here
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Install this after rerouting the cable a different direction, if feasible.
https://www.thebikeshopstore.com/cat...IaAqfDEALw_wcB |
Originally Posted by fietsbob
(Post 20866246)
Tried running the cable down the other way? ..pulling around the pulley, right to left ... then to the FD..
Originally Posted by AnkleWork
(Post 20866332)
You can avoid the pulley and clamp altogether by adding a length of housing between the last stop on the frame and the cable anchor.
Originally Posted by le mans
(Post 20866276)
Can't the cable run outside the clamp, or am i missing something?
Originally Posted by dsbrantjr
(Post 20866495)
Yes, Never Fix A Running Piece.
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