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 08-31-08, 10:28 AM   #1
soupy
Newbie
Thread Starter
 
Join Date: Aug 2008
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A pin fell out of my STI barrel adjuster!

Here's my tale of woe: I found that my front shifter wasn't working at all - I think I must have accidentally twisted the barrel carrying my bike upstairs - so I tried loosening the barrel to fix it.

Not my first mistake, but a mistake nonetheless!

A small pin, roughly 2mm in length and shaped vaguely like a cotter pin (except symmetric) fell out of the barrel adjuster on my down tube. (I have STI 105 shifters.) Looking at the right side barrel, it was probably wedged in next to the rotating part.

Should I try to get it back in? If so, how?

Thanks!
soupy is offline   Reply With Quote
Old 08-31-08, 11:05 AM   #2
bikeman715
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
Posts: 2,419
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
did you find a small spring than goes over the barrel ? and the two parts goes into the plastic adjuster. you will have to remove the cable from the front dérailleur, I think you might need to replace the barrel adjuster parts which you can buy at your lbs for around $5. strew the adjuster back into it's post back off by one turn run the cable though it, reconnect it to the dérailleur and adjust the tension so it will shift again using the adjustment barrel.
bikeman715 is offline   Reply With Quote
Old 08-31-08, 11:06 AM   #3
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
I've installed a bunch of Shimano downtube cable stops and I don't recognize the part you are describing.

The left-side (front derailleur) stops consist of:

An aluminum housing.

A 5 mm allan head retaining bolt that fastens the housing to the shifter boss.

A plastic "thimble" that you can turn by hand to adjust the cable tension. It has a notched bottom edge to keep it from turning spontaneously,

A metal cup with a threaded shank that goes through the plastic thimble and threads into the housing. The cup is the receiver for the cable housing.

A small coil spring that also goes around the threaded shank to keep it under tension.

There are no small pins of any description I've ever seen.
HillRider is offline   Reply With Quote
Old 08-31-08, 03:03 PM   #4
z415
Senior Member
 
z415's Avatar
 
Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A picture of where it popped out of and the said part might help, but as HillRider said, there is no retaining/cotter style pin there. Is there one on the right side?
z415 is offline   Reply With Quote
Old 08-31-08, 03:19 PM   #5
jsharr
You Know!? For Kids!
 
jsharr's Avatar
 
Join Date: Apr 2005
Location: Just NW of Richardson Bike Mart
Bikes: '05 Trek 1200 / '90 Trek 8000 / '? Falcon Europa
Posts: 6,157
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Did you possibly find a cable end crimp? If so, it was not supposed to be there I imagine
__________________
Are you a registered member? Why not? Click here to register. It's free and only takes 27 seconds! Help out the forums, abide by our community guidelines.
Quote:
Originally Posted by colorider View Post
Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
jsharr is offline   Reply With Quote
Old 08-31-08, 04:00 PM   #6
z415
Senior Member
 
z415's Avatar
 
Join Date: Apr 2006
Location: Gainesville/Tampa, FL
Bikes: Trek 1000, two mtbs and working on a fixie for commuting.
Posts: 2,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
So, since we are in agreement that such a thing should be there and is not necessary, is your bike working now? Does the front shifting work?
z415 is offline   Reply With Quote
Old 08-31-08, 08:33 PM   #7
BikingGrad80
that bike nut
 
BikingGrad80's Avatar
 
Join Date: Jul 2007
Location: Chicago north
Bikes: 2010 Motobecane Immortal Force 90' Trek 1400; 90' Trek 850; 06' Trek 520; 01 Iron Horse Victory
Posts: 933
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
If you are unable to loosen the barrel adjuster the threads are probably full of debris or corrosion. If possible, get some penetrating oil in there and turn it looser and tighter then apply triflow or another proper lubricant or even better get some grease onto the threads. Never done that before so not sure if you can completly unscrew them to access the treads.
BikingGrad80 is offline   Reply With Quote
Old 08-31-08, 08:39 PM   #8
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Quote:
Originally Posted by BikingGrad80 View Post
Never done that before so not sure if you can completly unscrew them to access the treads.
Yes you can. The cup with the threaded shank, tension spring and plastic thimble can be unthreaded as a complete unit and the threads cleaned and greased or oiled.
HillRider is offline   Reply With Quote
Old 09-01-08, 10:11 AM   #9
soupy
Newbie
Thread Starter
 
Join Date: Aug 2008
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://i35.tinypic.com/16a2jio.jpg

I was referring to the small silver clip that juts out of the barrel. You can see part of it in the gap as well. I don't know if it was meant to be removed when the bike was assembled, because it's not held in very well!

I got it back in and the bike is shifting. Thanks!
soupy is offline   Reply With Quote
Old 09-01-08, 11:00 AM   #10
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,852
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
OK, those aren't Shimano cable stops but were made up to use in the braze-on fittings on the frame.

If you look closely you can see the end of the braze-on is notched and the tab probably rides in the notches as a retainer to keep the barrel from turning under vibration.
HillRider is offline   Reply With Quote
Old 09-08-08, 05:24 AM   #11
soupy
Newbie
Thread Starter
 
Join Date: Aug 2008
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ah. That makes sense.

Thanks!
soupy 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 09:29 AM.