Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-24-10, 05:36 PM   #1
skibum157
Junior Member
Thread Starter
 
Join Date: Jun 2010
Bikes:
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear derailer bent!

Im pretty new at road biking and i just did my longest trip. 85 mile from schenectady to Lake George. But I think I bent my rear derailer. I have a shimano sora derailer and it appears to be bent outwards away from the wheels. I think it may have bent when I fell over( i just got the spd pedals and shoes, had a few falls ; ) I think that it bent and it is preventing me from shifting into 1rst gear, plus the derailer seems to be making alot more noise and gear grinding than it used to. Is there anything i can do to unbend it, or should i just bring my bike into a shop?

Thanks for any help!
skibum157 is offline   Reply With Quote
Old 06-24-10, 05:40 PM   #2
facial
Junkmaster
 
Join Date: Aug 2007
Location: Arcadia, California
Bikes: Lemond "Alpe d'Huez," several X-marts, and two Trek hybrids
Posts: 134
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I faced a similar problem, but examine whether it is the dropout connector piece. My aluminum piece got bent slightly, so I bent it back in shape.

If it is really the RD mechanism that deformed, examine whether you can adjust the tension the cable (usually a finger-tightening extension - a piece of semi-ergonomic plastic - right where the cable meets the RD). Eyeball it with your left eye: The upper small gear should coincide exactly with the desired cog.

If it's impossible, replace.
facial is offline   Reply With Quote
Old 06-24-10, 05:47 PM   #3
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,322
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 54 Post(s)
It's difficult to straighten the hanger so that it's correctly aligned and even more difficult to do the derailleur - not always possible. I would recommend you take it to a shop.
cny-bikeman is offline   Reply With Quote
Old 06-24-10, 06:02 PM   #4
wrk101
DRF aka Thrifty Bill
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: The NC Mountains
Bikes: 86 Katakura Silk, 87 Prologue, 87 Cimarron, 14 frame school custom, 73 Paramount
Posts: 19,976
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
+1 Take it to a shop. You probably bent the hanger, not the derailleur. But either way, you will need a bike shop to square it away.
wrk101 is offline   Reply With Quote
Old 06-24-10, 08:31 PM   #5
the sasquach
Member
 
Join Date: Jun 2006
Bikes:
Posts: 37
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
+2 (? i'm new to this forum stuff). How well your derailleur is aligned to your cassette will directly impact the functional range of adjustment (call it wiggle room) for your derailleur. If it is out if alignment, it may be nearly impossible to get it to shift correctly throughout the whole cassete. Even if you can it may fall out of adjustment quickly. Properly aligned you may be able to turn your barrel adjuster a whole turn before the derailleur stops shifting properly.
A straight hanger will shifter more accurately and for longer without problems.
the sasquach is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 01:08 AM.