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 10-28-10, 01:37 AM   #1
Barchettaman
Senior Member
Thread Starter
 
Barchettaman's Avatar
 
Join Date: Oct 2008
Location: Frankfurt, Germany
Bikes: Focus trash find commuter, Eddy Merckx Corsa, BP Stealth TT bike, Leader 720 TT bike, Boardman Comp Hybrid drop bar conversion, Quantec CX budget cyclocross build, SerottaNOS frameset ready to build up!
Posts: 1,239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Threaded headset adjustment - before I start.....

... a couple of quick questions.
My recently aquired (last night) MBK Amateur has a 1" threaded headset that is ´sticky´at the straight ahead position i.e. it doesn´t want to turn away from straight on.

Am I right in thinking that the headset is likely to be overtightened? It´s Shimano 105.

Would the Park Tool headset adjustment viideo be a good place to look before I start unscrewing stuff?

I thought I would break with tradition and actually ask for advice before I start wrenching on a bit of the bike.

Thanks in advance!

Simon
Barchettaman is offline   Reply With Quote
Old 10-28-10, 02:01 AM   #2
MichaelW
Senior Member
 
Join Date: Feb 2001
Location: England
Bikes:
Posts: 12,926
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Explain more.
Is the stem stuck inside the head-tube. This is not a headset issue at all.
Is the locknut stuck on the headset.
MichaelW is offline   Reply With Quote
Old 10-28-10, 03:17 AM   #3
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 5,492
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Quote:
Originally Posted by Barchettaman View Post
... My ..has a 1" threaded headset that is ´sticky´at the straight ahead position i.e. it doesn´t want to turn away from straight on.
This usually means that for one reason or another the bearing races have become dimpled, and when the balls line up with the dimple[s] it acts as a detent. Backing off on the bearing preload might make the issue less noticeable, but is unlikely to make it go away. Going from caged balls to loose balls is another popular way of trying to prolong life in damaged headsets, the idea being to break up the alignment between dimples and balls.

Quote:
Originally Posted by Barchettaman View Post
..Am I right in thinking that the headset is likely to be overtightened?
Probably not, or only partially, depends on how bad its sticking. In a perfect world an overtightened headset would simply be smoothly resistant to turning whatever angle the wheel is pointing at.

Quote:
Originally Posted by Barchettaman View Post
Would the Park Tool headset adjustment viideo be a good place to look before I start unscrewing stuff?
Depends on you mechanical skills. If you're concerned enough to ask it's probably a good idea.
dabac is offline   Reply With Quote
Old 10-28-10, 03:31 AM   #4
johnker1
Newbie
 
Join Date: Oct 2010
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
would like to know too

Seychelle Gabriel
Watch Tron Legacy Online

Last edited by johnker1; 11-17-10 at 10:16 PM.
johnker1 is offline   Reply With Quote
Old 10-28-10, 03:36 AM   #5
MitchL
Senior Member
 
MitchL's Avatar
 
Join Date: Aug 2010
Location: Maine
Bikes:
Posts: 149
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I found this website very helpful when I first took apart a headset.
MitchL is offline   Reply With Quote
Old 10-28-10, 03:43 AM   #6
ArthurIhde
Senior Member
 
Join Date: Oct 2010
Bikes:
Posts: 173
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yes i need more details
ArthurIhde is offline   Reply With Quote
Old 10-28-10, 05:21 AM   #7
Barchettaman
Senior Member
Thread Starter
 
Barchettaman's Avatar
 
Join Date: Oct 2008
Location: Frankfurt, Germany
Bikes: Focus trash find commuter, Eddy Merckx Corsa, BP Stealth TT bike, Leader 720 TT bike, Boardman Comp Hybrid drop bar conversion, Quantec CX budget cyclocross build, SerottaNOS frameset ready to build up!
Posts: 1,239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Right chaps, thanks all for the replies.

The stem is not stuck in the head tube, although it did require a light tap on the top to release it.

The stem has been tightened up again and the problem is still there.

I am inclined to go with the dimple theory.

I will let you know how things go. It´s a shame because the rest of the bike was more or less ready to ride from the get-go, I just don´t feel confident about taking it through traffic with this steering issue.
Barchettaman is offline   Reply With Quote
Old 10-28-10, 08:20 AM   #8
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,688
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
It's not an adjustment issue. Have the headset replaced.
Grand Bois is offline   Reply With Quote
Old 10-28-10, 08:24 AM   #9
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Posts: 19,850
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
dabac is correct. Another option is to remove the cups, and reinstall them so that the dimples don't line up together any more. A new headset is ideal, but not necessary depending on how picky you are.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike
Homebrew01 is offline   Reply With Quote
Old 10-28-10, 12:29 PM   #10
Barchettaman
Senior Member
Thread Starter
 
Barchettaman's Avatar
 
Join Date: Oct 2008
Location: Frankfurt, Germany
Bikes: Focus trash find commuter, Eddy Merckx Corsa, BP Stealth TT bike, Leader 720 TT bike, Boardman Comp Hybrid drop bar conversion, Quantec CX budget cyclocross build, SerottaNOS frameset ready to build up!
Posts: 1,239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
OK, to the shop it is :-(

Thanks all for the advice.
Barchettaman is offline   Reply With Quote
Old 10-28-10, 01:27 PM   #11
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Posts: 19,850
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 185 Post(s)
If it's dimpled, then it may turn freely, but it will sort of "click" into place in the straight ahead position, and take a tiny nudge to turn one way or the other. If it's tight to turn no matter the position, then it could just be an adjustment issue .... too tight.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike
Homebrew01 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 07:42 PM.