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 09-06-06, 12:07 AM   #1
dmjaeger
Junior Member
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Jockey Wheels Riding on Cassette

I'm new to the Bike Forums, and I have a question that may be obvious to someone a bit more experienced than myself with how rear derailers work.

For some time I've had a problem with the top jockey wheel riding or hitting my highest gear. It sounds and feels like a subtle grinding. What is going on? I have adjusted the set screw that is supposed to push the damn thing away from the cassette, but it is not doing the trick any more. So, short of replacing the set screw, shouldn't there be something else I can adjust?

I just replaced my casette too, for a different reason. But now it seems to bump or hit even worse.

I'm riding with a Shimano 400CX derailer (is that a piece of crap? I don't know) and a new SRAM PG-850 12-26.

My inclination is to replace the derailer. But something tells me that is not right. HELP!
dmjaeger is offline   Reply With Quote
Old 09-06-06, 12:41 AM   #2
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Tighten up the B-tension screw on the rear of the derailleur.
DannoXYZ is offline   Reply With Quote
Old 09-06-06, 12:55 AM   #3
dmjaeger
Junior Member
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by DannoXYZ
Tighten up the B-tension screw on the rear of the derailleur.
I have tightened the B-tension screw as much as it can go. It seems to be a bit bent, or at an angle anyway, so maybe the thing that it screws into is bent.

It appears that by removing the spacer from behind the casette, and thereby shifting the entire cluster towards the wheel by that small amount, might have done the trick. Its not riding as hard on the normal configurations. Of course, when I go to my granny up front and to the 26t on the rear, it still rides/hits big time.

Any other answers would be sooo sweet.
dmjaeger is offline   Reply With Quote
Old 09-06-06, 04:57 AM   #4
Wogster
Senior Member
 
Wogster's Avatar
 
Join Date: Jul 2006
Location: Toronto (again) Ontario, Canada
Bikes: Norco Bushpilot (out of commission), Raleigh Delta
Posts: 6,941
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dmjaeger
I have tightened the B-tension screw as much as it can go. It seems to be a bit bent, or at an angle anyway, so maybe the thing that it screws into is bent.

It appears that by removing the spacer from behind the casette, and thereby shifting the entire cluster towards the wheel by that small amount, might have done the trick. Its not riding as hard on the normal configurations. Of course, when I go to my granny up front and to the 26t on the rear, it still rides/hits big time.

Any other answers would be sooo sweet.
Have you checked that it's not bent, check the derailler and the hanger to make sure that neither is bent in some way, you might also try removing the derailleur from the hanger, and try to position it towards the back of the bike a little, and see if that helps. I would guess that the hanger is bent by a mm or two, and that is why removing the spacer helped. If it is bent, then take it to your LBS to get it realligned.
Wogster is offline   Reply With Quote
Old 09-06-06, 07:54 AM   #5
aerodave
I'm not hardcore
 
Join Date: Oct 2005
Location: Dayton, OH
Bikes:
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Might want to check your chain length. If your B-tension adjustment won't correct it, your chain might be a little long.
aerodave is offline   Reply With Quote
Old 09-06-06, 08:02 AM   #6
maddmaxx 
Small Member
 
maddmaxx's Avatar
 
Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
Posts: 7,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 132 Post(s)
If the B screw is not contacting the flat lip on the right dropout then it is indeed bent or the derailleur is improperly installed. The screw pushes against that lip so that when it is screwed in, the derailleur is moved farther away from the cassette. Sometimes when a derailleur is installed, the B screw is not kept clear of the dropout and is sort of "mashed" up against the side of the dropout. You can keep the screw clear by holding the body of the derailleur back while tightening the mounting fastener. Chain tension (length) and spring tension in the derailleur also affect this adjustment.
maddmaxx is offline   Reply With Quote
Old 09-07-06, 12:50 AM   #7
dmjaeger
Junior Member
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This is all quite helpful. Thanks for your feedback. I'm going to try to shorten the chain by a few links, and if that doesn't do the trick then I'll bring it in to the LBS to see about some bent frame/derailer problems.

Thanks!
dmjaeger 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 04:49 PM.