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 11-29-06, 09:47 AM   #1
chiefroastbeef
Junior Member
Thread Starter
 
Join Date: May 2005
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear Derailleur skipping while going up hill

hello guys,

The other night i had chain stuck, i couldn't free the chain from the front chainrings because it was a super tangled mess. So i used my foot and jumped on the pedal as hard as i can to free it (i'm not the brightest).

Turns out that i bent one of the chain links and caused a skip whenever it goes through the rear derailleur cage gears.

So i got a new chain, and the problem still persists. When i ride on flat ground the bike rides fine, but only when i ride up a slope will the rear derailleur skip during every revolution. I can't figure out the problem.

Do i have a bent derailleur cage?

I'll probably just take it to my shop since i suck with the rear derailleur.

Thank you in advance,


take care
chiefroastbeef is offline   Reply With Quote
Old 11-29-06, 10:08 AM   #2
Sheldon Brown
Gone, but not forgotten
 
Sheldon Brown's Avatar
 
Join Date: Jul 2002
Location: Newtonville, Massachusetts
Bikes: See: http://sheldonbrown.org/bicycles
Posts: 2,301
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by chiefroastbeef
The other night i had chain stuck, i couldn't free the chain from the front chainrings because it was a super tangled mess. So i used my foot and jumped on the pedal as hard as i can to free it (i'm not the brightest).

Turns out that i bent one of the chain links and caused a skip whenever it goes through the rear derailleur cage gears.

So i got a new chain, and the problem still persists. When i ride on flat ground the bike rides fine, but only when i ride up a slope will the rear derailleur skip during every revolution. I can't figure out the problem.

Do i have a bent derailleur cage?
This probably has nothing to do with the derailer. If it is skipping every revolution of the chain you've got a stiff link, most likely the link where you joined the chain.

There's a trick for fixing this, explained at http://sheldonbrown.com/derailer-adjustment

It's also possible that your old chain and cassette had worn together, so the new chain doesn't mesh properly with the worn cassette.

See: http://sheldonbrown.com/chains for detailed info on this.

If you still have the old chain, it would be helpful to pick up a ruler and measure it for elongation.

Sheldon "Chains" Brown
Code:
+-----------------------------------------------------------------+
|  Love seems the swiftest, but it is the slowest of all growths. |
|  No man or woman really knows what perfect love is until they   |
|  have been married a quarter of a century.        --Mark Twain  |
+-----------------------------------------------------------------+
Sheldon Brown is offline   Reply With Quote
Old 11-29-06, 10:28 AM   #3
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 3,085
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Less likely than Sheldon's options is the possibility that the RD is a bit off and needs to be moved in or out a bit with the RD cable tension adjuster. Screw the barrel in or out 1 full turn, remember which way you turned it and try it out. Then either reverse the adjustment or try 2 full turns for effect. Worst case is you end up with the RD on the next cog from where it should be but more likely the Rd will be obviously noisier as it moves from optimal positioning and by 1/4-1/2 turn increments you can dial it in. Just keep track of which way and how much you turn the adjuster and what your starting point was.
sch is offline   Reply With Quote
Old 11-29-06, 10:36 AM   #4
chiefroastbeef
Junior Member
Thread Starter
 
Join Date: May 2005
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks a lot guys! I will give those suggestions a try.

take care
chiefroastbeef is offline   Reply With Quote
Old 11-29-06, 11:52 AM   #5
jengel
Senior Member
 
Join Date: Aug 2006
Bikes:
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You might also check for a chipped tooth on chain wheels or cogs.
jengel is offline   Reply With Quote
Old 11-29-06, 03:38 PM   #6
kk4df
Senior Member
 
kk4df's Avatar
 
Join Date: Jun 2006
Location: Augusta, GA
Bikes: Bottecchia CF frame and fork, Ultegra 6603 crank and FD, DuraAce RD, Easton Vista wheels, Brooks B-17 saddle, Shimano 105 brakes, Michelin Pro2 Race tires
Posts: 639
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by chiefroastbeef
When i ride on flat ground the bike rides fine, but only when i ride up a slope will the rear derailleur skip during every revolution.
Every revolution of the entire chain, or every revolution of the rear wheel? If it's every wheel revolution, your cassette may be cocked sideways if the cassette was not initially torqued on properly.
kk4df is offline   Reply With Quote
Old 11-29-06, 05:20 PM   #7
chiefroastbeef
Junior Member
Thread Starter
 
Join Date: May 2005
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by kk4df
Every revolution of the entire chain, or every revolution of the rear wheel? If it's every wheel revolution, your cassette may be cocked sideways if the cassette was not initially torqued on properly.

I when to the smallest chainring and smallest cassette gear. Pedaled backwards and indeed the chain pops up from the cassette ring every revolution. So perhaps my cassette is cocked sideways, or according to Sheldon, i may have a shot cassette. Though the cassette looks relatively fine, then again what do i know.

thank you all for your wonderful suggestions. I'll look further into that cassette.

take care
chiefroastbeef is offline   Reply With Quote
Old 11-29-06, 11:57 PM   #8
sogood
Senior Member
 
sogood's Avatar
 
Join Date: Oct 2006
Location: Sydney, AU
Bikes: Bianchi, Ridley, GT
Posts: 944
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by sch
Less likely than Sheldon's options is the possibility that the RD is a bit off and needs to be moved in or out a bit with the RD cable tension adjuster. Screw the barrel in or out 1 full turn, remember which way you turned it and try it out. Then either reverse the adjustment or try 2 full turns for effect. Worst case is you end up with the RD on the next cog from where it should be but more likely the Rd will be obviously noisier as it moves from optimal positioning and by 1/4-1/2 turn increments you can dial it in. Just keep track of which way and how much you turn the adjuster and what your starting point was.
Not very scientific. If it's Campag 10 speed, move the chain to the 4th smallest cog and turn the cable tension adjuster until the upper jockey wheel is in perfect alignment with this cog. Alternatively, start from the beginning with the outer limit adjustment.
sogood is offline   Reply With Quote
Old 11-30-06, 05:27 AM   #9
kk4df
Senior Member
 
kk4df's Avatar
 
Join Date: Jun 2006
Location: Augusta, GA
Bikes: Bottecchia CF frame and fork, Ultegra 6603 crank and FD, DuraAce RD, Easton Vista wheels, Brooks B-17 saddle, Shimano 105 brakes, Michelin Pro2 Race tires
Posts: 639
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by chiefroastbeef
I when to the smallest chainring and smallest cassette gear. Pedaled backwards and indeed the chain pops up from the cassette ring every revolution. So perhaps my cassette is cocked sideways, or according to Sheldon, i may have a shot cassette. Though the cassette looks relatively fine, then again what do i know.

thank you all for your wonderful suggestions. I'll look further into that cassette.

take care

You may just need to remove the cassette, tighten up the screws that hold the cassette rings and spacers tight, and reinstall the cassette with proper torque setting.
kk4df is offline   Reply With Quote
Old 11-30-06, 07:19 AM   #10
jp_rcr
Senior Member
 
Join Date: Nov 2006
Bikes:
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yeah I alawys use my torque wrench NOT!!! it's not realistic. take it to your lbs (local bike shop) describe the problem. I would say it's the cassette/freewheel. ask your lbs to check for chain stretch an while you are there get a tune up. BIKES REQUIRE REGULAR MAINTANENCE
jp_rcr is offline   Reply With Quote
Old 01-30-07, 05:54 AM   #11
Michael Gugliel
Member
 
Join Date: Feb 2005
Bikes:
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
similar problem

I have a similar problem but only when pedaling on the smallest rear cog. Does this call for the same suggested solutions? All help appreciated!
Michael Gugliel is offline   Reply With Quote
Old 01-30-07, 01:16 PM   #12
Yardbird
Junior Member
 
Join Date: Feb 2006
Bikes:
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
When I had a similar problem, I had just put a new chain on. I couldn't get it to stop skipping off the rear cassette, especially in the lowest cog. After judiciously adusting the limits and dialing in the the derailuer cable length, I replaced the cassette with a new one. Problem solved. It would be very difficult to actually see the difference between the old cassette and the new one with a bare eye - curious. But it's fixed.

what do you know.......... more than you did before this.

rubber down........yardbird
Yardbird is offline   Reply With Quote
Old 01-30-07, 01:55 PM   #13
superunleaded
High Octane
 
superunleaded's Avatar
 
Join Date: May 2005
Location: Fremont, Ca
Bikes: Calfee, Spectrum, Colnago MxL, 3RENSHO, Softride Classic, TVT, Sentinel Whisper, Centurion Comp TA, Vitus 979, 92 RB-1, 94 RB-T, RADAC, 50th Anniversary Schwinn Paramount
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by chiefroastbeef
I when to the smallest chainring and smallest cassette gear.
You shouldn't do the small/small or big/big combination. Cross chaining can cause a lot of problems.
__________________
Meet Jack Ibagbaga (aka batillog)
http://batillog.blogspot.com/2007/05/wannabe-bob.html
superunleaded is offline   Reply With Quote
Old 01-30-07, 03:10 PM   #14
Sheldon Brown
Gone, but not forgotten
 
Sheldon Brown's Avatar
 
Join Date: Jul 2002
Location: Newtonville, Massachusetts
Bikes: See: http://sheldonbrown.org/bicycles
Posts: 2,301
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by chiefroastbeef
I when to the smallest chainring and smallest cassette gear
You should never, ever ride in that combination. It's the worst gear on the bike, and use of it kills chains and cassettes.

See: http://sheldonbrown.com/gears.html

Sheldon "No No" Brown
Code:
+-----------------------------------------------------+
|   If the King's English was good enough for Jesus,  |
|   it's good enough for me!                          |
|   -- "Ma" Ferguson, Governor of Texas (circa 1920)  |
+-----------------------------------------------------+
Sheldon Brown 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 07:47 PM.