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 08-01-05, 12:31 AM   #1
nomo4me
Senior Member
Thread Starter
 
Join Date: Apr 2005
Bikes:
Posts: 445
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear Derailleur lazy on big cogs

When shifting onto the largest two cogs while in the big front chain ring shifting is delayed and "lazy". Shifting back down poses no problems.

Brifters and rear der are both Dura Ace less than 6 months old. Bike and components are clean. Cable is lubed.
I suspect it's a cable tension issue. Can someone tell me how to correct it?
nomo4me is offline   Reply With Quote
Old 08-01-05, 12:45 AM   #2
MattP.
Obeying Gravity
 
Join Date: Oct 2004
Location: Bellingham, WA
Bikes:
Posts: 2,962
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The problem is probably that you never want to be in your largest cog and you largest chainring. And it will usually be "lazy" there. It stretches out the chain to much. Just try to aviod that combo. Also aviod the smallest cogs and the smallest chainring.
MattP. is offline   Reply With Quote
Old 08-01-05, 12:48 AM   #3
nomo4me
Senior Member
Thread Starter
 
Join Date: Apr 2005
Bikes:
Posts: 445
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by MattP.
The problem is probably that you never want to be in your largest cog and you largest chainring. And it will usually be "lazy" there. It stretches out the chain to much. Just try to aviod that combo. Also aviod the smallest cogs and the smallest chainring.
Eh, I got that wrong in my post. I'm not cross chained.
nomo4me is offline   Reply With Quote
Old 08-01-05, 12:52 AM   #4
Crank It Up
CyclePath
 
Crank It Up's Avatar
 
Join Date: Aug 2002
Location: So. Cal
Bikes: 1980 Austro Daimler Vent Noir/Reynolds 531/Campy NR/NGS. 1983 Univega Super Strada/Tange Champion/Dura Ace AX. 1984 Raleigh Elkhorn MTB. 2002 EPX 303/CF/Ultegra/105. 2005 Motobecane Fly Pro/XT/LX HT. 2006 Scattante CFR LE DA 10.
Posts: 193
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Almost all modern rear derailleurs are capable of shifting to largest rear cog while on the large chainring with proper adjustment of the limit screw BUT you're looking at excessive drivetrain wear. Also make sure that the RD cable is pulled taut while in the smallest rear cog. Fine tune it with the cable barrel adjuster.

Last edited by Crank It Up; 08-01-05 at 01:00 AM.
Crank It Up is offline   Reply With Quote
Old 08-01-05, 06:49 PM   #5
BostonFixed
Banned.
 
Join Date: Oct 2004
Bikes:
Posts: 4,418
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You need to tighten the tension on your rear der. cable. Find the adjuster at the rear der., and turn the adjuster counter-clockwise, as if you are loosening the adjuster. Do it in small increments at first (1/4 turns), and check shifting. Repeat as necessary. Be patient, and you can get it adjusted really well. It's not too hard.

Rear der. adjuster is what the fingers are touching in this pic:
BostonFixed is offline   Reply With Quote
Old 08-01-05, 08:08 PM   #6
nomo4me
Senior Member
Thread Starter
 
Join Date: Apr 2005
Bikes:
Posts: 445
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BostonFixed
You need to tighten the tension on your rear der. cable. Find the adjuster at the rear der., and turn the adjuster counter-clockwise, as if you are loosening the adjuster. Do it in small increments at first (1/4 turns), and check shifting. Repeat as necessary. Be patient, and you can get it adjusted really well. It's not too hard.

Rear der. adjuster is what the fingers are touching in this pic:
Thanks. Will delve in
nomo4me 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 05:46 PM.