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

ST 6510 shift lever action

Search
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.

ST 6510 shift lever action

Thread Tools
 
Search this Thread
 
Old 03-19-23, 10:11 AM
  #1  
stringmaster
Newbie
Thread Starter
 
Join Date: Oct 2014
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
ST 6510 shift lever action

When pushing the black downshift lever, the silver upshift lever also moves in the same direction before there is shift activation. This seems to result a large movement being required to make a shift. Is this normal, or a sign of wear? Can the shifter be adjusted to reduce the lever movement required to make the shift?

Thanks
Jim
stringmaster is offline  
Old 03-19-23, 10:35 AM
  #2  
curbtender
Senior Member
 
curbtender's Avatar
 
Join Date: Mar 2007
Location: SF Bay Area, East bay
Posts: 7,658

Bikes: Miyata 618 GT, Marinoni, Kestral 200 2002 Trek 5200, KHS Flite, Koga Miyata, Schwinn Spitfire 5, Mondia Special, Univega Alpina, Miyata team Ti, Santa Cruz Highball

Mentioned: 53 Post(s)
Tagged: 0 Thread(s)
Quoted: 1609 Post(s)
Liked 2,590 Times in 1,224 Posts
Things get dirty. Try spraying some triflo in to flush and lube.
curbtender is offline  
Likes For curbtender:
Old 03-19-23, 10:40 AM
  #3  
stringmaster
Newbie
Thread Starter
 
Join Date: Oct 2014
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
I have already flushed a lot with WD40 and lubed with Triflow.
stringmaster is offline  
Old 03-19-23, 10:55 AM
  #4  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,073

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4201 Post(s)
Liked 3,857 Times in 2,305 Posts
This is an internal issue, I believe a retaining spring has "gone bad". I've seen it on a number of STI levers of that era. Even with flushing and relubing (and doing this by removing the blade/pod from the body to soak in solvent) the primary (silver in this case) lever will still move with the secondary (release/black here) levers swing. Try holding the very end of the primary lever with one hand while moving the release lever and if that allows the previous shifting nature than you have what I am describing. The solution is a complete replacement lever/shift pod. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 03-19-23, 02:15 PM
  #5  
stringmaster
Newbie
Thread Starter
 
Join Date: Oct 2014
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Andy, Thanks for your reply, I believe you are correct. The black lever activates when the silver is held or when it is pushed far enough to exhaust the abnormal silver lever travel. Does anyone has a fix short of major internals replacement?
Thanks
Jim
stringmaster is offline  

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



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.