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 11-22-09, 06:37 AM   #1
breadbin
Senior Member
Thread Starter
 
breadbin's Avatar
 
Join Date: Jul 2006
Location: West of Ireland
Bikes: Raleigh 531c, Marin Muirwoods, Brodie Romax
Posts: 666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
apart from wear and tear is there any other cause of chain slipping?

I had a single speed on my mtb but found it to be too hard on my knees so i redid the wheel on a Deore hub with an XTR 9spd cassette, XT 9 speed rear mech and SRAM 9 spd chain.when i was setting it up they worked perfectly and changed gear perfectly smooth but when i put pressure on the pedals the chain slips really badly. i did play around with the barrel adjusters but the problem is still there. are them components ok together? the cassette looks perfect and the chain is brand new so don't know why it is happening
breadbin is offline   Reply With Quote
Old 11-22-09, 11:01 AM   #2
CCrew
Older than dirt
 
CCrew's Avatar
 
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
Posts: 5,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The derailer hanger could be bent. The B Limit could be set wrong. The indexing could be out. The low limit could be set wrong. Cables could be bad or incorrectly tensioned. That's just a few

Does it slip in all the gears or just a couple?
CCrew is offline   Reply With Quote
Old 11-22-09, 11:15 AM   #3
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the chain skips on just a few cogs, then those are probably your most-used cogs and they are worn out. Chain skip is when the chain stays on the intended cog, but won't transmit power. If the chains move to a larger or smaller cog, that's entirely different and could be either the RD alignament or simply the need to adjust the shift cable tension.

The best way to test for a worn out cassette is to put a new chain on it. If you had a chain with even a few hundred miles of use on it, that chain would probably work just fine on the cassette.
DaveSSS is offline   Reply With Quote
Old 11-22-09, 11:54 AM   #4
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CCrew View Post
The derailer hanger could be bent. The B Limit could be set wrong. The indexing could be out. The low limit could be set wrong. Cables could be bad or incorrectly tensioned. That's just a few

Does it slip in all the gears or just a couple?
No

The most likely cause is a worn cassette having a new chain thrown on it. If that cassette is not new, or extremely close to being new it will skip.
operator is offline   Reply With Quote
Old 11-22-09, 01:25 PM   #5
CCrew
Older than dirt
 
CCrew's Avatar
 
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
Posts: 5,343
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by breadbin View Post
the cassette looks perfect and the chain is brand new so don't know why it is happening
Unlike Operator who looks to have had one too many hits off the grounch bong today, I'll give the OP credit that he may actually know what he's looking at. I'd advise taking a good look at the Park Tools site and Sheldons, and stepping through from the beginning on the adjustments keeping a fresh mind that maybe just maybe something is just not quite adjusted right. I've seen something as simple as a not quite tight rear skewer cause similar issues without always arbitrarily condemning a part "just because"
CCrew is offline   Reply With Quote
Old 11-23-09, 07:57 AM   #6
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
CCrew...

The real issue is that the OP did not adequately describe his problem, but a chain slipping badly under a heavy load sure sounds like chain skip to me. Chain skip and poor RD adjustment do not exhibit the same symptoms. True chain skip never occurs due to an adjustment problem.
DaveSSS is offline   Reply With Quote
Old 11-23-09, 08:06 AM   #7
exRunner
Senior Member
 
exRunner's Avatar
 
Join Date: Feb 2009
Location: Long Island NY
Bikes: Panasonic 500
Posts: 750
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My chain will skip if it am on the 53/25 combo standing hard. Setting it does not do it. I have always assumed it is the chain line being so far off that causes it.

Save the the "cross-chaining" remarks. Already been through that argument.
exRunner is offline   Reply With Quote
Old 11-23-09, 08:43 AM   #8
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by exRunner View Post
My chain will skip if it am on the 53/25 combo standing hard. Setting it does not do it. I have always assumed it is the chain line being so far off that causes it.

Save the the "cross-chaining" remarks. Already been through that argument.

I guess there is no argument. Now you've acknowledged another reason it's not wise.
DaveSSS is offline   Reply With Quote
Old 11-23-09, 10:03 AM   #9
blamp28
Bikaholic
 
blamp28's Avatar
 
Join Date: Dec 2006
Location: Western, Michigan
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Posts: 1,465
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Those components are fine together. Since you say the cassette "looks fine" and the chain is brand new, I assume you are using a used cassette. This is , I believe what operator was getting at. Look for photos on Part or Sheldons site that picture new chain with worn cassettes and you may recognize your bike. It sounds like you need to try a new cassette. If that is not it, you will have a replacement ready for the next worn cassette anyway.
blamp28 is offline   Reply With Quote
Old 11-23-09, 10:05 AM   #10
engo
The spirit is willing...
 
engo's Avatar
 
Join Date: Oct 2005
Location: Ottawa, ON
Bikes: 2013 custom, 1994 Marinoni Special, 1934 Macleans Featherweight, 1984 Bertrand, 2011 self-built custom
Posts: 287
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had this problem once, and it turned out that one cog on the cassette was cracked radially, and when put under load, skipped. I didn't see the crack until I actually dismantled the cassette and examined the cogs closely. The skipping also haunted my GF for a while, and although the cassette on her bike looked good, it actually had just enough wear on one or two cogs to cause the problem.

I also had issues once when the removable link in my campy chain (Whipperman Connex link) was installed upside down, though that was less a "skip" than a "slip".

Hope you resolve the issue. The chain skip is probably one of the most annoying things I've ever had to deal with (in a cycling context).
engo is offline   Reply With Quote
Old 11-23-09, 10:10 AM   #11
exRunner
Senior Member
 
exRunner's Avatar
 
Join Date: Feb 2009
Location: Long Island NY
Bikes: Panasonic 500
Posts: 750
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by DaveSSS View Post
I guess there is no argument. Now you've acknowledged another reason it's not wise.
Just couldn't resist, could you?

Cross chain and try to make your chain skip. My guess is most people can't, so for the majority it still isn't an issue.
exRunner is offline   Reply With Quote
Old 11-23-09, 11:38 AM   #12
fiataccompli
Steel Member
 
fiataccompli's Avatar
 
Join Date: Jul 2008
Location: Knoxville, TN
Bikes: N + 1
Posts: 1,446
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
could a tight link on the chain cause the skip/slip?
fiataccompli is offline   Reply With Quote
Old 11-23-09, 11:47 AM   #13
StanSeven
Super Moderator
 
Join Date: Feb 2005
Location: Delaware shore
Bikes: Cervelo C3, Guru Photon, Waterford, Specialized CX
Posts: 11,996
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 162 Post(s)
Quote:
Originally Posted by fiataccompli View Post
could a tight link on the chain cause the skip/slip?
Yes.
StanSeven is offline   Reply With Quote
Old 11-23-09, 02:55 PM   #14
operator
cab horn
 
Join Date: Jun 2004
Location: Toronto
Bikes: 1987 Bianchi Campione
Posts: 28,306
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by exRunner View Post
My chain will skip if it am on the 53/25 combo standing hard. Setting it does not do it. I have always assumed it is the chain line being so far off that causes it.

Save the the "cross-chaining" remarks. Already been through that argument.
Rofl.

Nobody, on any of the bikes we sell that are 9/10/11 speed have people skipping on cross chain combos. Every gear combo that can be shifted into, can be used. You have a chainline problem that needs to be fixed - good for you. That has no relevance to this situation.
operator is offline   Reply With Quote
Old 11-23-09, 04:23 PM   #15
FlatMaster
Genius
 
FlatMaster's Avatar
 
Join Date: Jan 2008
Location: Auburn, AL
Bikes: Specilized Sirrus
Posts: 324
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
broken free-hub pawls. Just replaced mine. The bike is about 20 yrs old though.
FlatMaster is offline   Reply With Quote
Old 11-23-09, 04:50 PM   #16
DaveSSS
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
Posts: 4,987
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by operator View Post
Rofl.

Nobody, on any of the bikes we sell that are 9/10/11 speed have people skipping on cross chain combos. Every gear combo that can be shifted into, can be used. You have a chainline problem that needs to be fixed - good for you. That has no relevance to this situation.
You should really try an 11 speed drivetrain running in the 53/25 (largest cog) on a bike with chainstays of 406mm or shorter. Poor idea, IMO. I never do it and wouldn't recommend it to anyone who doesn't want premature chain failure. If that's what you recommend to your customers, they'd be wise to avoid your shop.

Chainline problems are really rare these days. Frames are made more accurately and the outboard bearing crank usually put the rings spot on the proper location.

Last edited by DaveSSS; 11-23-09 at 05:25 PM.
DaveSSS is offline   Reply With Quote
Old 11-23-09, 05:03 PM   #17
CrimsonKarter21
Mitcholo
 
CrimsonKarter21's Avatar
 
Join Date: Aug 2006
Location: Oost Vlaanderen in mind, Cleveland in body
Bikes: 2010 Mitcholo w/ Sram Force/Red
Posts: 8,850
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by FlatMaster View Post
broken free-hub pawls. Just replaced mine. The bike is about 20 yrs old though.
I had that happen to a 1.5 year old Fulcrum Racing Evo 5.
CrimsonKarter21 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 11:40 PM.