Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-29-07, 10:49 PM   #1
delay
I am an incurable.
Thread Starter
 
delay's Avatar
 
Join Date: Apr 2005
Location: Champaign, IL
Bikes: IRO Mark V pro (RIP), Bianchi Giro, Giant Xtc1, Redline Conquest Pro, Kelly Deluxe singlespeed.
Posts: 993
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ceramic bearings?

Does anyone have anything to say about ceramic bearings in their hubs? Honestly, I have no idea. However, I need to replace some cartridges and am considering it. So really, aside from price, is there any reason not to get ceramic?
__________________
www.oldsylebeer.com
delay is offline   Reply With Quote
Old 08-29-07, 11:11 PM   #2
dminor 
Moar cowbell
 
dminor's Avatar
 
Join Date: Oct 2004
Location: The 509
Bikes: are awesome.
Posts: 12,417
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I investigated them at Boca Bearings before they got ink in Mountain Bike Action. I ended up with standard steel industrial bearings but the ceramics were intriguing. Boca had the MBA article because they were wanting to move into the MTB market and were aggressively pushing their ceramics and offering sponsorships to run them. They are supposed to be tough but I worried abouut brittleness for suspension pivots; my concern may be unfounded.

I'd check the ceramics at Boca; they are a great company to deal with and their prices are hard to beat.
__________________

Quote:
Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."
dminor is offline   Reply With Quote
Old 08-30-07, 12:49 AM   #3
MulletArgyleman
Join the BLK MRKT
 
MulletArgyleman's Avatar
 
Join Date: Aug 2007
Location: In western B.C.
Bikes: KHS Alite 500(ht), CCM XR-4(fs).....08 Blk Mrkt Riot build(mint colour), w/ gold labels, juicy 3's, etc...
Posts: 491
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Zumba View Post
Ceramic bearings seem like a big gimmick for use in a bike. Bike wheels spin way too slowly to see much benefit, IMO.

Don't underestimate the amount of engineering that goes into developing even the most common, cheap, steel BB. They're cheap because they're popular. Many of these bearings are built to much higher tolerances than the hubs, and are able to withstand hundreds/thousands of pounds of force at high RPM (10,000+). If an MTB wheel spins at over 1000RPM, you're hauling ass (Kamikaze downhill).
Ha ha! For sure!
MulletArgyleman is offline   Reply With Quote
Old 08-30-07, 06:01 AM   #4
RIC0
PBR Racing
 
RIC0's Avatar
 
Join Date: Aug 2006
Location: Wifes $hit List
Bikes: Santa Cruz and Cannondale
Posts: 1,025
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Zumba View Post
Ceramic bearings seem like a big gimmick for use in a bike. Bike wheels spin way too slowly to see much benefit, IMO.

I agree
RIC0 is offline   Reply With Quote
Old 08-30-07, 07:12 AM   #5
Bike Lover
Should be riding
 
Bike Lover's Avatar
 
Join Date: Mar 2006
Location: S.E. Michigan
Bikes: C-dale- moutain, Pedal Force RS- Campy Record, Quiring Ti XTR, Red line Monocog, S E F@r
Posts: 1,602
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This is a fairly common topic in the road forum. The consensus seems to be that they're neat and you get bragging rights, because you can't see them, you'll have to tell someone you have them, they are only worth about 3% in effeciency. There is a test some where with that came up with this figure, I don't know where it is though. If you do a search in the road section you'll get many many hits on the topic.

If you need, or just want, to have the best of everything, there's nothing wrong with 'em. If you're looking for a marked improvement, look elsewhere. YMMV.
Bike Lover is offline   Reply With Quote
Old 08-30-07, 12:19 PM   #6
delay
I am an incurable.
Thread Starter
 
delay's Avatar
 
Join Date: Apr 2005
Location: Champaign, IL
Bikes: IRO Mark V pro (RIP), Bianchi Giro, Giant Xtc1, Redline Conquest Pro, Kelly Deluxe singlespeed.
Posts: 993
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
More specifically through sponsors I can get ceramic bearings at not much more money than ss. I was just wondering if anyone had a reason why "not" to use them. I know that generally they are probably not worth the money, but for me at this point money is not relevant.
__________________
www.oldsylebeer.com
delay is offline   Reply With Quote
Old 08-30-07, 02:25 PM   #7
dminor 
Moar cowbell
 
dminor's Avatar
 
Join Date: Oct 2004
Location: The 509
Bikes: are awesome.
Posts: 12,417
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
OK - -don't know if the sponsorship is Boca but I would shoot for the equivalent of their Ceramic Lightning Yellow-Seal bearings:

http://www.bocabearings.com/main1.aspx?p=docs&id=7

Here is what they have to say about them:
"The Boca Bearing Company is proud to announce the new Lightning Bearing Technology (LBT) line of ceramic bicycle bearings for hubs, bottom brackets, headsets and pivot points. Ceramic bearings are particularly well suited to both competitive and recreational bicycle applications.

They are lighter, stronger and have substantially less rolling resistance than steel bearings. Ceramic balls are virtually frictionless as well as being several times harder than steel, as a result they are faster and will last 4 or 5 times longer than standard bearings. Also, ceramic is 2/3 the weight of steel, and weight is always a factor in a bicycles performance. With unbeatable prices everyone can enjoy the advantage of Lightning Bearing Technology (LBT) by Boca Bearings. Please call or visit Boca Bearing's website for the complete cross reference guide to find the right bearings for your bike."


They recommend them for hubs and suspension pivots and they claim to be harder than steel. Hey, I'd go for it. In fact, I may apply next year myself
__________________

Quote:
Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."
dminor is offline   Reply With Quote
Old 08-30-07, 02:54 PM   #8
mcoine
Senior Member
 
Join Date: Dec 2005
Location: southern oregon
Bikes:
Posts: 2,631
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Zumba View Post
Slackjawed idiots will stare in amazement.
Stare at what exactly?
mcoine is offline   Reply With Quote
Old 08-30-07, 03:04 PM   #9
dminor 
Moar cowbell
 
dminor's Avatar
 
Join Date: Oct 2004
Location: The 509
Bikes: are awesome.
Posts: 12,417
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Zumba View Post
For negligible price difference, go for it. Something to brag about. Slackjawed idiots will stare in amazement.

As for Boca's claims on ceramic being "several times harder than steel", that's just BS. Steel bearings are hardened to well over 60c on the rockwell scale. Several times harder than that is not even possible for bearing materials. What's even stupider is that the inner and outer bearing races are still made out of steel. So according to Boca, the races don't matter... just the balls?
I wondered about this as well. I think it's akin to carbide - - yes a carbide blade will cut certain metals but it's also brittle and will chip.

Quote:
Originally Posted by Zumba View Post
Like I said earlier, the real benefit of ceramic won't be noticed at measly bicycle wheel speeds. The bearing balls are lighter, yes. That reduces centripetal force, but that force is negligible at under 1000 rpm. Industrial machine spindles use ceramic bearings, but they spin anywhere from 10,000 to 50,000 RPM. Small spindles can easily go well over 100,000 RPM. These bearings are typically lubed with a high pressure jet of oil. Not packed with grease with 2 rubber seals slapped on.
I can easily see its value for low/no-load high-RPM applications where most of the loading will be radial instead of axial.

Quote:
Originally Posted by Zumba View Post
The type of grease used in the bearing will affect performance much more in bicycle applications. And sealed bearings naturally have significantly more friction than shielded and open bearings.
That's always the pig-in-a-poke about industrial cartridge bearings, eh? What grease are they using? (Or is there any? I once had a sealed clutch throwout bearing that was assembled with no grease. One dead pressure plate later I discovered the ugly truth)
__________________

Quote:
Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."
dminor 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 08:33 AM.