HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Wed Mar 27, 2013 6:15 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7449
Location: Los Angeles
I suppose this question could have easily ended up in any of our subforums (road, cx, mtb) but I'll ask it here:

Has anyone managed to modify a crown race so it places the lower headset bearing closer to the crown on a traditional (non-integrated) fork?
Or does anyone know of a modification that was done in a way to have the same result?

The angled portion of the crown race would stay the same - that's the only part that really engages with the bearing. The portion below the angled bit would be decreased in thickness substantially, thereby brining the bearing much closer to the fork's crown.

Thoughts welcome.

_________________
Exp001


Top
 Profile  
 
PostPosted: Wed Mar 27, 2013 6:44 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1442
Location: Santa Cruz, California, USA
All the crown races I have seen have been very short, with no room to make them shorter. Admittedly it's been a while since I looked at an external headset.
But it seems like it'd be easier to find a shorter one with the appropriate bearing seat dimensions than to get a tall one machined down.


Top
 Profile  
 
Posted: Wed Mar 27, 2013 6:44 pm 


Top
  
 
PostPosted: Wed Mar 27, 2013 6:59 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7449
Location: Los Angeles
Thanks, I'll do some searching for matches.

I wasn't thinking about machining per se, but that is an option. I was thinking I can just re-build one with a shorter height and have it printed up. A little costly, but at least it will be pure aluminum (or titanium if I want)

_________________
Exp001


Top
 Profile  
 
PostPosted: Wed Mar 27, 2013 7:03 pm 
Offline

Joined: Fri Oct 28, 2011 3:25 am
Posts: 716
Location: United Kingdom of Great Britain and Northern Ireland
To what end? You could cut the fork crown instead, depending on what the crown is like.


Top
 Profile  
 
PostPosted: Wed Mar 27, 2013 7:41 pm 
Offline

Joined: Tue Dec 23, 2008 2:57 pm
Posts: 622
Location: NYC
prendrefeu wrote:
... thereby brining the bearing much closer to the fork's crown.
.



To what end? What is ur objective and why? EM3

_________________
______________

My 2013 Cervelo R5


Top
 Profile  
 
PostPosted: Wed Mar 27, 2013 8:00 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7449
Location: Los Angeles
The objective is aesthetics.

_________________
Exp001


Top
 Profile  
 
PostPosted: Wed Mar 27, 2013 8:31 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1442
Location: Santa Cruz, California, USA
A good machinist (not me) could shorten it on a lathe, but might need to make some tooling to hold it first.


Top
 Profile  
 
PostPosted: Thu Mar 28, 2013 3:12 pm 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1951
Location: NoVA/DC
Traditional fork, is the headset and frame traditional as well? Or is it an IS headset?


Top
 Profile  
 
PostPosted: Thu Mar 28, 2013 3:40 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7449
Location: Los Angeles
Traditional frame/headtube (external type headset) (aka 'ahead')
Fork designed for internal headset: the diameter of the crown is longer than traditional.

That (the diameter difference) is a separate issue: I may end up having to make my own lower cup to match things aesthetically.
However I've noticed that traditional headset/fork interfaces were designed to be o.k. with the space created by the crown race.
On integrated/internal, it seems that the headtube somewhat masks the space a bit, making it very slim (1mm gap or less between headtube and fork, much more aesthetically pleasing).

:noidea: Maybe I should look into other headsets.

_________________
Exp001


Top
 Profile  
 
Posted: Thu Mar 28, 2013 3:40 pm 


Top
  
 
PostPosted: Thu Mar 28, 2013 5:29 pm 
Offline
Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1951
Location: NoVA/DC
If you're using a campy-fit crown on an IS-spec bearing (even if that bearing is in external cups), the for Lo will sit tall. I doubt this is the case but it's worth looking into. If the crown were to, say, be pressed upside-down, it may fit in a lathe that way and have access to the bottom of the race to cut it away. Then all you need is the lathe.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 


Who is online

Users browsing this forum: Google Adsense [Bot], MSNbot Media and 53 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Crown race not sitting flush

[ Go to page: 1, 2, 3 ]

in Road

tinchy

38

1046

Wed Dec 18, 2013 6:07 am

goodboyr View the latest post

There are no new unread posts for this topic. Wilier SL crown race fitting.

in Road

iamnik

5

451

Tue Apr 30, 2013 2:30 pm

iamnik View the latest post

This topic is locked, you cannot edit posts or make further replies. Longer legs vs shorter torso

in Road

digitalnorbs

4

573

Wed Aug 07, 2013 9:10 pm

Powerful Pete View the latest post

There are no new unread posts for this topic. Tall headtubes & shorter reach geometry

[ Go to page: 1, 2 ]

in Road

iscarrr

18

2344

Fri Jul 26, 2013 10:42 pm

tinozee View the latest post

There are no new unread posts for this topic. Cervelo R3 axle to crown lenght. 2014

in Road

Tmg57

4

465

Sun Dec 29, 2013 5:23 pm

Tmg57 View the latest post


It is currently Sun Apr 20, 2014 11:20 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB