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 06-15-08, 05:51 PM   #1
kpmupnorth
Junior Member
Thread Starter
 
Join Date: Mar 2008
Bikes:
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dura ace headset question

just picked up a Cannondale racing bike from a friend, today. I think it is about 10 years old and seems to be in top condition. However,the headset is very peculiar from anything I have experienced before. It seems to lock/click when the wheel is perfectly straight forward. It swings freely in both directions and feels completely smooth otherwise. I am wondering if this particular model had some type of built-in groove on purpose, or do I just happen to have a headset race that has worn. What seems peculiar is that the "locking position" is precisely in the center. Any thoughts or advice you may have on this would be greatly appreciated. My only frame of reference is a 20-year-old Italian racing bike with Shimano 600 that has now become a favorite with my teenage boys.
kpmupnorth is offline   Reply With Quote
Old 06-15-08, 06:37 PM   #2
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the Dura Ace headset is a cartridge-bearing model, replace the bearing cartridges.
mechBgon is offline   Reply With Quote
Old 06-15-08, 06:42 PM   #3
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Posts: 20,039
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 275 Post(s)
Quote:
Originally Posted by kpmupnorth View Post
just picked up a Cannondale racing bike from a friend, today. I think it is about 10 years old and seems to be in top condition. However,the headset is very peculiar from anything I have experienced before. It seems to lock/click when the wheel is perfectly straight forward. It swings freely in both directions and feels completely smooth otherwise. I am wondering if this particular model had some type of built-in groove on purpose, or do I just happen to have a headset race that has worn. What seems peculiar is that the "locking position" is precisely in the center. Any thoughts or advice you may have on this would be greatly appreciated. My only frame of reference is a 20-year-old Italian racing bike with Shimano 600 that has now become a favorite with my teenage boys.
Yup. If it's a loose ball headset. the bearings have pounded little dents into the races so they like to settle there. You have several options. 1) You can leave it as-is. You probably won't notice while you're riding. 2) Remove the races, then re-install them. This will un-align the little dents so you don't notice it any more. 3) Buy a new headset.
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike
Homebrew01 is online now   Reply With Quote
Old 06-15-08, 07:16 PM   #4
kpmupnorth
Junior Member
Thread Starter
 
Join Date: Mar 2008
Bikes:
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks MechBgon. How would I know if it is a cartridge headset? I presume I will have to take it apart? The only info on the top nuts is "Shimano HP 7400 BCT. If it is a cartridge, any ideas on where to aquire a new set? If not a cartridge ...?
kpmupnorth is offline   Reply With Quote
Old 06-15-08, 10:25 PM   #5
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by kpmupnorth View Post
Thanks MechBgon. How would I know if it is a cartridge headset? I presume I will have to take it apart? The only info on the top nuts is "Shimano HP 7400 BCT. If it is a cartridge, any ideas on where to aquire a new set? If not a cartridge ...?
That's good info. The 7400-series Dura Ace is not cartridge, so you could either remove the crown race from the fork crown and press it back on after turning it to a new orientation, or get a new crown race, or get a new headset.

If you decide to get a new headset, a Shimano 105 cartridge-bearing model might be a good pick. If you want to try to hunt down a new crown race, try older LBSs in your area who might still have one in their stash.
mechBgon 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 09:07 PM.