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 08-25-07, 11:54 AM   #1
sfrider
Oil it!
Thread Starter
 
sfrider's Avatar
 
Join Date: May 2006
Location: San Francisco, CA
Bikes:
Posts: 1,201
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why would a B screw get bent?

I just discovered one of my bikes had a bent B screw. I was switching to a wheel with a 12-27 10sp cassette instead of a 12-25 and found the derailer cog was running at against the 27t cog on the cassette. That's when I discovered I couldn't add tension with the B screw because it wouldn't go in further. Took it out and had a look, and sure enough the screw was solidly bent. Took a screw from another bike and it went in fine, with perfect indexing and all, so it seems to be the screw only. There's no scratching anywhere to indicate any part has been hit. It's kind of a difficult place to kick or bump too without hitting something else, and the screw doesn't look particularly weak. I'm really wondering what might have caused this? I hope it's not indicative of a bigger problem!
sfrider is offline   Reply With Quote
Old 08-25-07, 12:29 PM   #2
BrooklynMachine
Works
 
BrooklynMachine's Avatar
 
Join Date: Jun 2007
Location: 16 Powers Street
Bikes: You won't believe what's in our stable.
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Our guess is that it probably happened during installation of the rear wheel? Perhaps the axle or QR banged into it on it's way to being centered at the dropout.
BrooklynMachine is offline   Reply With Quote
Old 08-25-07, 12:53 PM   #3
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chain too short?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF 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 08:17 PM.