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 02-21-09, 01:44 PM   #1
YungBurke
Waiting for his CX
Thread Starter
 
YungBurke's Avatar
 
Join Date: Jul 2008
Location: Atlanta, Georgia; Lewisburg Pennsyvania
Bikes: Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
Posts: 453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Strange Drivetrain noise/ behavior

Hey guys I have a puzzler. My drivetrain has been behaving very strangely. Whenever I put any kind of power down, there is this strange grinding noise which comes from the casette area. Also, periodically the chain will feel like it slips for about 1/4 of a chainring revolution. I replaced the chain, oiled, and adjusted the rear derailleur and the slipping is less prounouced, but the grinding and some slip is still present. It occurs on every chain ring and there doesnt look like any "shark fin" action on any of the rings. One thing I have noticed is the derailleur seems to not rotate as freely and will sometimes seem to get caught and rise up towards the chainstay slightly. It also isnt as effective at holding the chain on the right cog when backpedalling. The cage looks like it may be bent, and I am investigating a replacement now, but does this seem consistent with the symptoms?
YungBurke is offline   Reply With Quote
Old 02-21-09, 02:41 PM   #2
DaJMasta
Senior Member
 
Join Date: Feb 2009
Location: Austin, TX
Bikes: Giant XTC Team Custom XC bike, Nashbar tourer custom commuter
Posts: 208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Could it be a problem with the ratchet mechanism in the freehub?
DaJMasta is offline   Reply With Quote
Old 02-21-09, 03:09 PM   #3
YungBurke
Waiting for his CX
Thread Starter
 
YungBurke's Avatar
 
Join Date: Jul 2008
Location: Atlanta, Georgia; Lewisburg Pennsyvania
Bikes: Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
Posts: 453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by DaJMasta View Post
Could it be a problem with the ratchet mechanism in the freehub?
This is definitely a possibility. I may have bent the axle at some point or another, there is a very slight "wobble" in the cassette if you freewheel quickly. The only thing is this phenomenon has existed for a while without the above issue, and the wobble may just be an illusion of the shift ramp pattern since its only perceptable at high rpm.
YungBurke is offline   Reply With Quote
Old 02-21-09, 03:48 PM   #4
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: 28,844
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
A new chain on a used cassette will frequently cause skipping.

Also, check the new chain for a tight link. Pedal backwards slowly and watch the chain as it exits the lower rd pulley. A tight link will cause a kink in the chain at that point that is obvious.
HillRider is offline   Reply With Quote
Old 02-21-09, 03:50 PM   #5
Panthers007
Great State of Varmint
 
Panthers007's Avatar
 
Join Date: Sep 2008
Location: Dante's Third Ring
Bikes:
Posts: 7,479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd overhaul the freehub. Sounds like it might need new pawls, or something.

Good luck.
Panthers007 is offline   Reply With Quote
Old 02-21-09, 06:44 PM   #6
YungBurke
Waiting for his CX
Thread Starter
 
YungBurke's Avatar
 
Join Date: Jul 2008
Location: Atlanta, Georgia; Lewisburg Pennsyvania
Bikes: Jamis Satellite, Motobecane Fantom Cross UNO, Fuji Team singlespeed
Posts: 453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider View Post
A new chain on a used cassette will frequently cause skipping.

Also, check the new chain for a tight link. Pedal backwards slowly and watch the chain as it exits the lower rd pulley. A tight link will cause a kink in the chain at that point that is obvious.
Yeah, im familiar with this this, but the problem got a bit better with a new chain. Also, no tight links on the chain, and the skipping only occurs under moderately heavy pedaling/ accelerating.
YungBurke 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 06:17 AM.