Weight Weenies
* FAQ    * Search
* Login   * Register
HOME Listings Articles FAQ Contact About

View unanswered posts | View active topics


Board index » Discussion » Road



Post new topic Reply to topic  Page 2 of 5
  [ 61 posts ] 
Go to page Previous  1, 2, 3, 4, 5  Next
  Print view Previous topic | Next topic 
Author Message
spytech
 Post subject:
PostPosted: Tue Nov 04, 2003 9:11 pm 
Offline
User avatar

Joined: Wed Oct 22, 2003 12:34 pm
Posts: 1608
Location: New York City
nikh wrote:
You got me thinking about replacing the bearings in my King headset :shock: :cry:


i think in the future, all bearings will be ceramic, from what i read its easier to make a more perfectly rounder ball bearing. quality is almost always great.

so, everyone lets upgrade to a smoother rolling lighter future :lol:
Top
 Profile  
 
Joel
 Post subject:
PostPosted: Tue Nov 04, 2003 9:39 pm 
Offline

Joined: Fri Jun 13, 2003 1:43 pm
Posts: 751
Location: Belgium
The WR bike has just the lightest components, not the best
Top
 Profile  
 
nicrump
 Post subject:
PostPosted: Tue Nov 04, 2003 9:43 pm 
Offline

Joined: Thu Oct 23, 2003 5:18 pm
Posts: 706
Location: Austin
ok,ok. i said a while back. it was '93 to be exact. came back from interbike with them. so, that said, they have come a long way.

_________________
www.crumptoncycles.com
Top
 Profile  
 
nicrump
PostPosted: Tue Nov 04, 2003 9:49 pm 
Offline

Joined: Thu Oct 23, 2003 5:18 pm
Posts: 706
Location: Austin
The centrifugal load is described by F= -mT2R where m is the weight of the ball. Because the density of silicium nitride is 60% of steel, the centrifugal load is reduced by using these balls with 60%. As a consequence the running speed can be increased up to 30%.
Because the E-modulus of silicium nitride is about 1.5 times that from steel, a smaller contact surface exists with the consequence of a high contact pressure. So, the benefit of a small centrifugal load is limited by the large E-modulus. From Hertz theory it follows that the maximum load for the combination steel- silicium nitride reduced with 30%.

A decrease of 60% centrifugal loading in combination with a 30% decrease in load capacity finally results in an increase of running speed with only 15%.

A third effect, that frictional heating between the ceramic balls and the steel rings is less, further positively affect the maximum running speed.

_________________
www.crumptoncycles.com
Top
 Profile  
 
nikh
 Post subject:
PostPosted: Tue Nov 04, 2003 10:41 pm 
Offline

Joined: Fri Jun 27, 2003 8:05 pm
Posts: 2070
Thanks for that....I think :shock: :? :)

_________________
PLAY DARTS! *WARNING* MUST HAVE A SENSE OF HUMOR TO PLAY!!!
Top
 Profile  
 
spytech
PostPosted: Tue Nov 04, 2003 10:59 pm 
Offline
User avatar

Joined: Wed Oct 22, 2003 12:34 pm
Posts: 1608
Location: New York City
nicrump wrote:
The centrifugal load is described by F= -mT2R where m is the weight of the ball. Because the density of silicium nitride is 60% of steel, the centrifugal load is reduced by using these balls with 60%. As a consequence the running speed can be increased up to 30%.
Because the E-modulus of silicium nitride is about 1.5 times that from steel, a smaller contact surface exists with the consequence of a high contact pressure. So, the benefit of a small centrifugal load is limited by the large E-modulus. From Hertz theory it follows that the maximum load for the combination steel- silicium nitride reduced with 30%.

A decrease of 60% centrifugal loading in combination with a 30% decrease in load capacity finally results in an increase of running speed with only 15%.

A third effect, that frictional heating between the ceramic balls and the steel rings is less, further positively affect the maximum running speed.



did you think that out yourself, or do you have a source?
Top
 Profile  
 
JTC
 Post subject:
PostPosted: Wed Nov 05, 2003 3:55 am 
Offline

Joined: Wed Oct 22, 2003 6:05 pm
Posts: 571
This all sounds very interesting. Will it be possible to replace the bearing in the head set and hubs? We need a guinea pig to try this out. Any ideas on real weight savings? Is it going to be worth the cost and effort?
Top
 Profile  
 
Superlite
 Post subject:
PostPosted: Wed Nov 05, 2003 5:51 am 
Offline
User avatar

Joined: Fri Aug 29, 2003 9:01 pm
Posts: 2477
Location: Colorado
In the words of Master P. NAH!! I called one of those places today, to replace the bearings in my rear hub around $700!!!!!!! HOLY SNIHCKIES!!

_________________
MAMA SAID KNOCK YOU OUT! HUH!
Top
 Profile  
 
nikh
 Post subject:
PostPosted: Wed Nov 05, 2003 1:04 pm 
Offline

Joined: Fri Jun 27, 2003 8:05 pm
Posts: 2070
Superlite wrote:
In the words of Master P. NAH!! I called one of those places today, to replace the bearings in my rear hub around $700!!!!!!! HOLY SNIHCKIES!!


Da-da-damnnnnnnnnn, thats a whole lot of money!!

_________________
PLAY DARTS! *WARNING* MUST HAVE A SENSE OF HUMOR TO PLAY!!!
Top
 Profile  
 
Superlite
 Post subject:
PostPosted: Wed Nov 05, 2003 5:23 pm 
Offline
User avatar

Joined: Fri Aug 29, 2003 9:01 pm
Posts: 2477
Location: Colorado
TELL ME ABOUT IT!! i could buy another set of my wheels for that much. Guess thats why Z 3 wheels cost 3 g's, vs, 1350 for an almost identical set of 303's. I don't know about you guys but unless I start ridding in the Tour regular bearings are plenty good for me.

_________________
MAMA SAID KNOCK YOU OUT! HUH!
Top
 Profile  
 
nikh
 Post subject:
PostPosted: Wed Nov 05, 2003 5:35 pm 
Offline

Joined: Fri Jun 27, 2003 8:05 pm
Posts: 2070
I'd like some FIR wheels for my MTB 1200g!! But they cost around 2.5K!!



Image

_________________
PLAY DARTS! *WARNING* MUST HAVE A SENSE OF HUMOR TO PLAY!!!
Top
 Profile  
 
Superlite
 Post subject:
PostPosted: Wed Nov 05, 2003 5:38 pm 
Offline
User avatar

Joined: Fri Aug 29, 2003 9:01 pm
Posts: 2477
Location: Colorado
Do those have ceramic bearings? Or just a random thought? :wink:

_________________
MAMA SAID KNOCK YOU OUT! HUH!
Top
 Profile  
 
nikh
 Post subject:
PostPosted: Wed Nov 05, 2003 5:39 pm 
Offline

Joined: Fri Jun 27, 2003 8:05 pm
Posts: 2070
Just dreaming along with ceramic bearings!!

_________________
PLAY DARTS! *WARNING* MUST HAVE A SENSE OF HUMOR TO PLAY!!!
Top
 Profile  
 
Kirkster
PostPosted: Wed Nov 05, 2003 5:44 pm 
Offline
User avatar

Joined: Wed Nov 05, 2003 4:17 pm
Posts: 16
spytech wrote:
nicrump wrote:
The centrifugal load is described by F= -mT2R where m is the weight of the ball. Because the density of silicium nitride is 60% of steel, the centrifugal load is reduced by using these balls with 60%. As a consequence the running speed can be increased up to 30%.
Because the E-modulus of silicium nitride is about 1.5 times that from steel, a smaller contact surface exists with the consequence of a high contact pressure. So, the benefit of a small centrifugal load is limited by the large E-modulus. From Hertz theory it follows that the maximum load for the combination steel- silicium nitride reduced with 30%.

A decrease of 60% centrifugal loading in combination with a 30% decrease in load capacity finally results in an increase of running speed with only 15%.

A third effect, that frictional heating between the ceramic balls and the steel rings is less, further positively affect the maximum running speed.



C'mon Guys just ride the damn Bike! :roll:

_________________
Marching on Together...............
Top
 Profile  
 
nicrump
 Post subject:
PostPosted: Wed Nov 05, 2003 6:07 pm 
Offline

Joined: Thu Oct 23, 2003 5:18 pm
Posts: 706
Location: Austin
a valid point, but the wrong forum. this is about geeking out over weight and physics.

_________________
www.crumptoncycles.com
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 2 of 5
  [ 61 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next

Board index » Discussion » Road

Who is online

Users browsing this forum: fa63, Google [Bot] and 39 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 
This topic is locked, you cannot edit posts or make further replies. Ceramic bearings for BB - worth it?

in Road

NiFTY

0

428

Wed Aug 08, 2012 2:00 pm

NiFTY View the latest post

There are no new unread posts for this topic. Zipp ZedTech - ceramic bearings?

in Road

drmutley

1

474

Fri Jun 29, 2012 6:40 am

thisisatest View the latest post

There are no new unread posts for this topic. Bearings for Mavic Classics SSC Ceramic Wheelset

in Road

Stolichnaya

2

353

Wed Aug 01, 2012 11:24 am

Stolichnaya View the latest post

This topic is locked, you cannot edit posts or make further replies. Help & advice needed - Lightweight Wheels - ceramic bearings

in Road

duzza

2

452

Thu Sep 06, 2012 12:40 am

reggiebaseball View the latest post

There are no new unread posts for this topic. HELP! Changing Look 695 ZED 2 bearings

in Road

Graysk

4

710

Fri Sep 21, 2012 7:52 am

Graysk View the latest post


It is currently Wed Jun 19, 2013 12:54 am

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