Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Fri Sep 30, 2016 4:21 am
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 28 posts ]  Go to page 1 2 Next
Author Message
 Post subject: fastest bb on market
PostPosted: Fri Mar 10, 2006 8:36 am 
Offline
User avatar

Joined: Sat Jan 08, 2005 2:12 pm
Posts: 88
every one try to get the lightest bottom bracket, but im looking for the smoothest one, the one with less drag in bearing.
i heard that durace for example dosent spin alot without chain - ie to much bearing drag.
one has told me that loose bearing bb are the fastest, and some pros still using them (alot in TT) and replace the grease with oil lube as it save energy over long distance.

any comments where can i get loose brearing bb, am i right ?


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 8:43 am 
Offline
User avatar

Joined: Tue Jan 04, 2005 9:13 pm
Posts: 308
You should take into consideration the fact that bearing act differently with load than they do without (w/o chain as you mentioned).

Even if the cranks spin "further" without the chain on them, they might be harder to push up an 8-10% hill pushing hundreds of watts through them...


Top
   
 Post subject:
Posted: Fri Mar 10, 2006 8:43 am 


Top
   
 
 Post subject:
PostPosted: Fri Mar 10, 2006 8:50 am 
Offline
User avatar

Joined: Sat Jan 08, 2005 2:12 pm
Posts: 88
:idea: didnt think about it, thanks.
so the only way is to "lab test" (under real use) the bb to know wich is the fastest.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 9:02 am 
Offline

Joined: Mon Oct 25, 2004 10:02 pm
Posts: 1944
Location: Getting dropped
The FSA mega exo ceramic bb's aren't bad.

_________________
- Zipp rims will break if you look at them too hard
- R-Sys wheels will spontaneously explode
- The ZG crankset will never, ever exist
- Everyone needs Lightweights, even if they're fat and old
- Parts actually made of metal are SO 10 years ago


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 9:21 am 
Offline
User avatar

Joined: Sat Jan 08, 2005 2:12 pm
Posts: 88
2002SaecoReplica wrote:
The FSA mega exo ceramic bb's aren't bad.


i was looking at FSA web site and found this:

Tests by the Danish magazine Cykel-Motion (Mar 2005)
and subsequently supported by calculation, show how using
ceramic bearings can reduce rolling resistance by 50%, saving
22m in just 55 seconds at 32kph. In short, astounding speed
improvement of 4%.

Further tests by SKF, and confirmed by the Danish cycle magazine
Cykel Magasinet (Sep 2005), describe dramatic reductions
in friction compared to conventional cycle bearings. For example:

With a pair of race wheels (total of six bearings), friction with
ceramic bearings is reduced 22 fold
While Dura Ace pulleys consume 0.78W @ 500rpm, ceramic
pulleys use less than 0.06W
A Record BB @ 100rpm and 400W consumes 0.6W, the same
BB with ceramic bearings consumes 0.02W


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 9:25 am 
Offline
Resident Pro
User avatar

Joined: Mon Apr 18, 2005 9:34 am
Posts: 1784
can't one send his dura ace bb to someone and they put ceramic bearings in it? i thought it is phil wood, but i didn't find it on their homepage.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 9:38 am 
Offline

Joined: Thu Sep 02, 2004 10:19 am
Posts: 354
Location: Germany
Hi,
Acros has or is coming with a BB with ceramic bearings for dura ace. I have no further info on this, i read it in cycling+.
J.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 10:15 am 
Offline
User avatar

Joined: Thu Aug 05, 2004 7:33 am
Posts: 2436
Location: Europe
simon wrote:
can't one send his dura ace bb to someone and they put ceramic bearings in it? i thought it is phil wood, but i didn't find it on their homepage.


Simon, are you thinking of http://www.ceramicspeed.com/ ? They are in Denmark, but I don't think you have to send in the bb, you could just order the bearings and install them yourself (or have the LBS do it for you), this saves you from having to remove the cups from the frame and having to miss the bb for a while.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 10:46 am 
Offline
User avatar

Joined: Tue Jun 17, 2003 7:00 am
Posts: 1045
Location: Copenhagen, Denmark
Edited because I was way too slow. :oops:

_________________
Just get out and ride!
Principia Revolution on road & Rivette H6 off road!


Last edited by Knut on Fri Mar 10, 2006 11:14 am, edited 1 time in total.

Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 11:04 am 
Offline
User avatar

Joined: Sun Jan 08, 2006 5:53 pm
Posts: 1465
Location: Leiden, NETHERLANDS
Boonen seems to know his ways! Good tip!

At Ceramic Speed they are very helpful and they have a ceramic bearing for almost every bicycle part even the wheels in the pulley!

They are helpful guys too! I ride with their BB bearings since 2001 and they still are great no problems at all! But this is not inexpensive stuff! Really high end and those bearings keep going .....

And guys they safe some weight :D

I do recommend them too!

_________________
My bike is Italian so it is Nervosa and of course has Anorexia I like them thin!
GIOS "New" Carbon Ultra 2006 Campa Record+Special parts.
GIOS "New" A90 2008 Campa Record+Special parts. My winter and vacation bike.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 1:18 pm 
Offline

Joined: Wed Mar 01, 2006 3:16 am
Posts: 37
Simon,

I just had a local shop replace my XTR bearings with Phil Wood bearings using their new tool. I haven't had a chance to ride them yet and they are not ceramic, but if you open the link below you can see the new tool and how to use it. It only took about 5 minutes to have it done.

http://velonews.com/galleries/OBBTOOLINST.pdf


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 4:13 pm 
Offline

Joined: Tue Dec 23, 2003 9:28 pm
Posts: 1769
Location: Unknown parameter
I thought that study quoted on the FSA site was interesting because if you extrapolate from those numbers replacing pedal, BB, hubs and jockey wheels with ceramic bearings could save almost 2.5 watts. :lol: (but I still want some!)


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 4:18 pm 
Offline

Joined: Sat Jan 14, 2006 1:17 am
Posts: 615
Location: UK/Singapore
2.5W? Wow.. who needs fancy deep section wheels when it costs so much less to just get ceramic bearings instead.


Top
   
 Post subject:
PostPosted: Fri Mar 10, 2006 4:31 pm 
Offline
Shop Owner
User avatar

Joined: Sun Feb 06, 2005 4:22 pm
Posts: 3684
Location: Tucson, Az.
I've tried the FSA ceramics, and wasn't at all impressed. Beyond seals that were tight(which has never bothered me) The bb had
2 bad hitches. Two distinct detents in it. Not nearly as smooth as a campy or Phil wood.

I have to question the FSA study. Although I am not sure, but I suspect that this test was done with ceramic bearings, and then extrapolated to match the FSA bb. I think if this bottom bracket were to be tested, it would not match the numbers that are to be predicted for it.

I am not arguing that significant savings can be made with ceramic bearings, I am a big advocate of using them. I just think that the FSA bearing themselves have some issues. Theres alot that goes into the reduction of resistance because of ceramic bearings, and a big part of that is the tolerances and types of materials used.

So in this case I have to call shananigans.

Nowhere does it say that FSA ceramic bearing were even tested. It says that tests have shown ceramic bearings reduce resistance. I think we all knew this already, As we know that aero rims are more aero than box section. But to say that because a Zipp rim is aero, that someone elses carbon rim is just as aero is wrong.

_________________
Fair Wheel Bikes

Fair Wheel Blog

Instagram


Top
   
 Post subject:
Posted: Fri Mar 10, 2006 4:31 pm 


Top
   
 
 Post subject:
PostPosted: Fri Mar 10, 2006 4:45 pm 
Offline
User avatar

Joined: Sun Apr 03, 2005 4:39 pm
Posts: 304
I don't want to pollute this thread, but I was wondering if there is a company making good ceramic bearings for the record bottom bracket ?


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 28 posts ]  Go to page 1 2 Next

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Fastest 650c tires currently produced?

in Road

eyedrop

3

482

Wed Apr 27, 2016 4:44 pm

Grinley View the latest post

There are no new unread posts for this topic. A new contender at the aero market?

[ Go to page: 1 2 ]

in Road

wheelsONfire

27

3819

Sun Jan 10, 2016 4:08 am

attesa38 View the latest post

There are no new unread posts for this topic. Is there a market for non-UCI aero road bikes ?

in Road

LetsRide

11

1972

Sat Sep 17, 2016 1:16 pm

Shrike View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Bing [Bot], dynaserve, Yahoo [Bot] and 21 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:  
Powered by phpBB® Forum Software © phpBB Limited