Bent Front Derailleur
10-20-16, 06:45 AM
#1
Newbie
Thread Starter
Join Date: Oct 2016
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Bent Front Derailleur
Was in a crash with my bike and my Di2 Ultegra 6870 Front Derailleur seems to be bent. Have tried to position the front derailleur, but it wont turn more left. Can I bend the front derailleur back with a plier? Or is there somthing wrong with the chainline?
Thanks for help!
Thanks for help!
10-20-16, 08:08 AM
#2
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,084
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4205 Post(s)
Liked 3,864 Times
in
2,312 Posts
It's hard to see if your der is a "braze on" or a clamp around attachment. But the braze on version has a tiny set screw that contacts the seat tube just below and behind the mounting tab. This screw is to prevent the der from twisting on the tab during the shifting (as a braze on mounting is a less secure method compared to the clamp around). This screw will also hinder your attempts to reposition the der unless it's loosened first. Shimano has instructions on it's website. Andy.
10-20-16, 09:10 AM
#3
Newbie
Thread Starter
Join Date: Oct 2016
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
It is a braze-on front derailleur. First I tried to turn the support bolt, but the front derailleur wont turn more left (clockwise). The front derailleur will only turn counter-clockwise. When I have the bike in the lowest gear, the chain is rubbing against the front derailleur. The low-screw wont turn more outwards than I have it now.
I think my only solution right now is to try to bend the front derailleur or moving the crankset more to the right?
Thanks for help!
I think my only solution right now is to try to bend the front derailleur or moving the crankset more to the right?
Thanks for help!
10-20-16, 09:21 AM
#4
Banned
Crash bent? replace it. I suspect Di2 is not tolerant of Manhandling it..
I'd not buy stuff I cannot fix (personally) But so much of the traffic I read Here is doing the Opposite.
'/,
I'd not buy stuff I cannot fix (personally) But so much of the traffic I read Here is doing the Opposite.
'/,
Last edited by fietsbob; 10-20-16 at 10:27 AM.
10-20-16, 09:40 AM
#5
Senior Member
Join Date: May 2010
Location: Bastrop Texas
Posts: 4,479
Bikes: Univega, Peu P6, Peu PR-10, Ted Williams, Peu UO-8, Peu UO-18 Mixte, Peu Dolomites
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 966 Post(s)
Liked 1,629 Times
in
1,045 Posts
Long ago I learned the hard way that when ever you take a spill a close inspection is an absolute rule. Anything bent needs to be taken apart. Especially with newer light weight bikes (Post 1970s).
After you take your dérailleur off you might find not only a bent hanger but also a tear or crack in your seat tube or something else predicting a future failure.
Buddy of mine after a light spill found a cracked bottom bracket on his beautiful ALAN. I think that day we all cried (long walk too)...
Anyway... what I'm saying is take it apart and look close, check it all....
After you take your dérailleur off you might find not only a bent hanger but also a tear or crack in your seat tube or something else predicting a future failure.
Buddy of mine after a light spill found a cracked bottom bracket on his beautiful ALAN. I think that day we all cried (long walk too)...
Anyway... what I'm saying is take it apart and look close, check it all....
__________________
No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)
