Head Set install
05-17-14, 02:37 AM
#1
Luis Pacheco
Thread Starter
Join Date: Nov 2007
Location: Azores Islands, Portugal
Posts: 13
Bikes: 2006 Allez Comp, 2012 Secteur
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Head Set install
Hi all,
I need your help for instalation of the headset on the fork and frame.
I tryed to install the crown race first, than the lower bearing. Unfortunaly it seams the bearing doesn't fit over the crown race. I tryed to press it no sucess. please refer to the pictures
Is there any special procedure I may be missing?
Thank you for your help,
Luis
I need your help for instalation of the headset on the fork and frame.
I tryed to install the crown race first, than the lower bearing. Unfortunaly it seams the bearing doesn't fit over the crown race. I tryed to press it no sucess. please refer to the pictures
Is there any special procedure I may be missing?
Thank you for your help,
Luis
05-17-14, 03:38 AM
#2
Senior Member
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Posts: 6,681
Bikes: 8 ss bikes, 1 5-speed touring bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 86 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
the third picture looks okay. can you adjust it properly?
if you don't think it has gone down all the way and don't want to fiddle around finding another one, i'd just take a little emery cloth to the race.
it might even seat some more if ridden for a while. of course you'd have to readjust the headset a few times.
but to answer your specific question. no, there is no special procedure you are missing, AFAIK. someone else will probably have something to say that may be more satisfying.
if you don't think it has gone down all the way and don't want to fiddle around finding another one, i'd just take a little emery cloth to the race.
it might even seat some more if ridden for a while. of course you'd have to readjust the headset a few times.
but to answer your specific question. no, there is no special procedure you are missing, AFAIK. someone else will probably have something to say that may be more satisfying.
Last edited by hueyhoolihan; 05-17-14 at 03:48 AM.
05-17-14, 07:14 AM
#4
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
The first two pictures make me think you installed a 1" crown race on a 1-1/8" steerer. That gap is WAY too big.
05-17-14, 12:38 PM
#7
Luis Pacheco
Thread Starter
Join Date: Nov 2007
Location: Azores Islands, Portugal
Posts: 13
Bikes: 2006 Allez Comp, 2012 Secteur
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Opps my old brain wook up.
I was changing the crown race with the upper compressing ring. lesson learned.
Thank you for the messages.
Luis
I was changing the crown race with the upper compressing ring. lesson learned.
Thank you for the messages.
Luis
05-17-14, 02:15 PM
#8
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,701
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5776 Post(s)
Liked 2,574 Times
in
1,425 Posts
In all likelihood, this model cartridge bearing doesn't use a pressed on crown race.
In traditional cup/cone headsets the crown race is pressed on to ensure an absolutely zero movement fit. But cartridge bearings don't work this way. The crown race is part of the bearing, so all that's needed on the fork is a centering cone. The cone may be pressed on like a crown race, or it may be split, and work with a taper in the crown race (part of the bearing) to constrict following the same principle as on the upper bearing of threadless systems.
Usually parts are measured pretty close to leave a minimal gap between the fork and heat tube. If the gap is too large, it's possible the OP has the upper and lower centering cones reversed, or more likely (based on the photo) the lower cone was sized for a fork that lacked the enlarged seat area used for press fit crowns, and now is opened to a larger than designed diameter.
The problem is that some carbon forks still have the 30mm crowns needed for pressed on crown races, while others don't and require the split cone used with integrated designs, and sized for 28.8mm.
In traditional cup/cone headsets the crown race is pressed on to ensure an absolutely zero movement fit. But cartridge bearings don't work this way. The crown race is part of the bearing, so all that's needed on the fork is a centering cone. The cone may be pressed on like a crown race, or it may be split, and work with a taper in the crown race (part of the bearing) to constrict following the same principle as on the upper bearing of threadless systems.
Usually parts are measured pretty close to leave a minimal gap between the fork and heat tube. If the gap is too large, it's possible the OP has the upper and lower centering cones reversed, or more likely (based on the photo) the lower cone was sized for a fork that lacked the enlarged seat area used for press fit crowns, and now is opened to a larger than designed diameter.
The problem is that some carbon forks still have the 30mm crowns needed for pressed on crown races, while others don't and require the split cone used with integrated designs, and sized for 28.8mm.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
05-17-14, 02:34 PM
#9
Great State of Varmint
Join Date: Sep 2008
Location: Dante's Third Ring
Posts: 7,476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 15 Times
in
15 Posts
For my next trick: I will use my Bottom-Bracket Facer on my new carbon-everything bike frame!
See you on U-Tube...
See you on U-Tube...
Thread
Thread Starter
Forum
Replies
Last Post
illdthedj
Bicycle Mechanics
19
12-14-10 11:38 AM
