Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Shimano Shift Problems

Notices
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.

Shimano Shift Problems

Old 04-23-12, 08:02 PM
  #1  
Bishbike
Senior Member
Thread Starter
 
Bishbike's Avatar
 
Join Date: Nov 2007
Location: Boston, MA
Posts: 251

Bikes: 2002 Bianchi Eros, 2013 Peter Mooney Custom

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Shimano Shift Problems

I was hoping someone here could help me. I am having rear shifting problems with a Shimano 105 setup.

Everything shifts great until I go from the largest cog in the rear to the next smallest cog. When I shift I hear one click, but the chain moves down 2 cogs. I am not crosschaining, the chain is in the small ring, although same thing will happen on the big ring. The chain and cassette are new, new cables and housings, and had the derailer hanger alignment checked and adjusted by LBS.

When I put the bike on the stand and shift while turning the cranks slowly, it seems like the shifter is letting out too much cable causing the chain to skip to the next smallest cog.


Bike otherwise shifts great. I am stumped.

Is it possible the shifter is starting to wear out after 20000 miles?

Any help would be appreciated.
Bishbike is offline  
Old 04-23-12, 08:11 PM
  #2  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,179

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 35 Post(s)
Tagged: 0 Thread(s)
Quoted: 1408 Post(s)
Likes: 0
Liked 235 Times in 187 Posts
I expect your low limit screw is set slightly too tight so the chain isn't really shifting to the largest cog securely. Try loosening it 1/4 turn at a time and see if that corrects the problem After each adjustment, check carefully to be sure it doesn't let the chain spill to the inside.
HillRider is offline  
Old 04-23-12, 08:23 PM
  #3  
Bishbike
Senior Member
Thread Starter
 
Bishbike's Avatar
 
Join Date: Nov 2007
Location: Boston, MA
Posts: 251

Bikes: 2002 Bianchi Eros, 2013 Peter Mooney Custom

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks Hill, i will check that.
Bishbike is offline  
Old 04-24-12, 12:50 AM
  #4  
Kimmo 
bike whisperer
 
Kimmo's Avatar
 
Join Date: Dec 2009
Location: Melbourne, Oz
Posts: 8,565

Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 915 Post(s)
Liked 259 Times in 193 Posts
+1 Hillrider.

If you examine the innards of an indexed DT lever, you can see there's a bigger jump in cable travel to the smallest cog. AFAIK it's fairly typical for there to also be a slightly increased pull to get on the biggest cog too.
Kimmo is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JJ121591
Bicycle Mechanics
17
06-10-16 11:52 AM
RonH
Bicycle Mechanics
8
07-07-14 06:08 PM
hbsyncro
Bicycle Mechanics
1
09-08-10 11:15 PM
hbsyncro
Mountain Biking
2
09-07-10 09:07 PM
fitzdawg
Bicycle Mechanics
1
07-17-10 07:30 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.