Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Front Deraileur karked it today

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Front Deraileur karked it today

Old 08-22-03, 12:47 AM
  #1  
NZLcyclist
MaNiC!
Thread Starter
 
NZLcyclist's Avatar
 
Join Date: Feb 2003
Location: Hamilton, New Zealand
Posts: 1,600

Bikes: 2004 Cervelo Soloist 105, 2005 Apollo Apex, 2006 SCOTT Speedster S30

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Front Deraileur karked it today

Hi all,

Turned across traffic to the right today onto a street that has the biggest hill on my commute, went to change down on the chainrings (double), the shifter clicked a lil bit louder than normal (Sora) amd the DR proceeded to move slightly to the left and rub on the chain. I stopped, and had a look, the cable was slack like it should be abd the problem seems to be in the DR itself. There is no tension on it and it flops about. Like as though the spring has gone? havnt had a good look yet, but I had to force it into the small chainring, and then it was still floppy and it rubbed on the chain all 2km home. This combined with the fact that the cable for my rear DR needs replacing and I cant change there either meant I rode up this damn hill at 17kmh in a 39x21 with a loud rubbing noise, while heaving a big school bag..... i didnt dare stop for the red light! it was safe to keep going, no road on my side. grrr!

Brendon
NZLcyclist is offline  
Old 08-22-03, 03:20 AM
  #2  
Ed Holland
8speed DinoSORAs
 
Ed Holland's Avatar
 
Join Date: Jul 2002
Location: Oxford, UK or Mountain View, Ca
Posts: 2,749
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Bad luck NZL,

Yes it does sound like the spring has broken in the derralieur mechanism, but make sure that the shifter is still pulling the cable properly. How old is your bike- is it still under guarantee? If not, the good news is that a replacement FD is not expensive.

My bike is Sora too, and there have been a few problems with the front mech. At one point it seized and I had to completely dismantle it & re-lube to bring it back to life. It has also never been possible to adjust the system exactly right to prevent rubbing, but this is partly due to flexability in the frame and my love of mashing in high gears.

Hope you can get it sorted,

Cheers,

Ed
__________________
Get a bicycle. You will certainly not regret it, if you live.
Ed Holland is offline  
Old 08-22-03, 09:28 AM
  #3  
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Posts: 3,531
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 175 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
It only takes 2-3min to take the derailleur off the bike and examine it closely to see if the cage return/load spring is broken. The spring is visible from the L side of the bike, it is a cylinder wrapped around the cage pivot with a straight
section a bit less than a cm. long at each end, one pushing on the cage and
the other on an eccentric on the casting arm the cage pivots on. If the cage
flops about that would rule out the most common scenario: a broken cable.
Steve

Last edited by sch; 08-22-03 at 12:14 PM.
sch is offline  
Old 08-22-03, 09:51 AM
  #4  
Chi
Rides with Cows
 
Chi's Avatar
 
Join Date: Apr 2003
Location: Fixing a flat
Posts: 1,232

Bikes: Trek 7000

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Upgrade time.
__________________
Chi is offline  
Old 08-24-03, 02:15 AM
  #5  
NZLcyclist
MaNiC!
Thread Starter
 
NZLcyclist's Avatar
 
Join Date: Feb 2003
Location: Hamilton, New Zealand
Posts: 1,600

Bikes: 2004 Cervelo Soloist 105, 2005 Apollo Apex, 2006 SCOTT Speedster S30

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
all fixed.

The lower bolt of the 2 holding the DR to the clamp on the frame had worked itself loose.

Brendon
NZLcyclist is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.