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Anybody own one of the 85g(!) ceramic BBs?

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Anybody own one of the 85g(!) ceramic BBs?

Old 08-08-06, 08:56 AM
  #1  
Sincitycycler
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Anybody own one of the 85g(!) ceramic BBs?

Is this VCRC BB any good? Durability vs. FSA?






Super High Quality Ceramic Ball Bearings
English Threads (68mm)
Only 85g! Compare to Dura Ace at 98g.
Compatible with all integrated style cranks (Dura Ace, Ultegra, 105, FSA, Bontrager, etc.)
Drastically reduced rolling resistance
Super Hard Titanium races
More durable and longer lasting than traditional stock bearings
This is one upgrade you can FEEL!!
Features of Ceramic bearings

60% lighter than steel
2 1/2 times harder than steel
Higher tolerance
Less heat development
Less vibration


Skeptical if ceramic bottom brackets work?

Try this simple test. Take off your chain or move it from the chainrings and let it rest on the bottom bracket shell of your frame. Now, with no resistance from your chain, spin your crank backwards as fast as you can. A typical Shimano 10 speed crank will spin 3-5 times and then stop. When using our ceramic bottom bracket, the crank spins 17, 18, 19 times or more! Imagine how much energy you save and how much power goes to pushing you forward and not overcoming extra resistance from your bb.

Ceramic bearings in your bottom bracket will shave 1-2 seconds per KM. In a 40k time trial that is 40-80 seconds of free time gain!

When sitting in a pack or when the pack is strung out, ceramic bearings mean you will be able to save energy while everyone around you is suffering!

This is what the Pros have been riding for the last 5 years
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Old 08-08-06, 09:20 AM
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It sounds like a good idea. Anything to reduce friction is good.

A local time trialist rebuilds his hubs before every race and uses the lightest lube available. Just enough lube for 50 km. He claims that it gets him at least ten seconds in a 20k TT. I'll ask him what BB he's using.
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Old 08-08-06, 09:23 AM
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Originally Posted by Sincitycycler
Is this VCRC BB any good? Durability vs. FSA?




Drastically reduced rolling resistance


**********

How does this reduce rolling resistance? They don't even come in contact with the road! I would think that the pedalling resistance/drivetrain resistance would be negligible compared to standard BB bearings.

IMHO, if I were going to upgrade to ceramic bearings, they would be in my wheel hubs.
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Old 08-08-06, 10:30 AM
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If they want easier to spin cranks, they should go back to cup and cones...
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Old 08-08-06, 11:39 AM
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The bearings are smoother because the materials present less friction between the bearings and bearing races. I'm highly skeptical of the claimed weight though. Token also makes a ceramic bearing bb that comes in at 145 grams that is supposed to be the bomb. The races have a titanium coating which is supposed to really make a difference. They claim their bb will last longer than any other ISIS bb on the market. Couple guys over at weightweenies have them and are happy with them.
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Old 08-08-06, 11:43 AM
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Originally Posted by Sincitycycler
Skeptical if ceramic bottom brackets work?

Try this simple test. Take off your chain or move it from the chainrings and let it rest on the bottom bracket shell of your frame. Now, with no resistance from your chain, spin your crank backwards as fast as you can. A typical Shimano 10 speed crank will spin 3-5 times and then stop. When using our ceramic bottom bracket, the crank spins 17, 18, 19 times or more! Imagine how much energy you save and how much power goes to pushing you forward and not overcoming extra resistance from your bb.
Do we get another BB for free if we order now and use a credit card?
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Old 08-08-06, 12:59 PM
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Originally Posted by ravenmore
I'm highly skeptical of the claimed weight though. Token also makes a ceramic bearing bb that comes in at 145 grams that is supposed to be the bomb.
The token 145g is an ISIS bb. The one mentioned in this thread is for integrated cranks like Dura Ace. 85g is very easy to obtain with a bb like this.
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Old 08-08-06, 01:12 PM
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Originally Posted by Sincitycycler
Ceramic bearings in your bottom bracket will shave 1-2 seconds per KM. In a 40k time trial that is 40-80 seconds of free time gain!

When sitting in a pack or when the pack is strung out, ceramic bearings mean you will be able to save energy while everyone around you is suffering!

This is what the Pros have been riding for the last 5 years
According to Cees Beers, replacing the bearings in the hubs and drivetrain saves 1 watt over 10km.

http://weightweenies.starbike.com/ph...er=asc&start=0
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Old 08-08-06, 01:45 PM
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Ceramic bearings give a neglible decrease in rolling resistence.
Cees Beers, as you can read in that thread, kinda pulled those figures out of his ass.
They will last longer (assuming they don't crack), but they are far too expensive to justify.
 
Old 08-08-06, 01:51 PM
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Zipp's recently updated website claims a 2-3 second advantage on a 40k TT with ceramic bearings in the hubs. I doubt ceramic bearings in the BB give any larger advantage. Umm, in that case, I can't justify the cost of ceramic bearings.
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Old 08-08-06, 02:04 PM
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It can't possibly be worth it. These things are completely embedded in the frame and offer no poseur points whatsoever. Maybe if they include a big decal with them that you can stick to your top tube so everyone in the coffee shop knows your BB bearings are worth more than their whole bike. Then I could see it.
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Old 08-08-06, 02:35 PM
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Originally Posted by steelforme
The token 145g is an ISIS bb. The one mentioned in this thread is for integrated cranks like Dura Ace. 85g is very easy to obtain with a bb like this.
ah - my bad then.
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Old 08-08-06, 03:25 PM
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Old 08-08-06, 03:36 PM
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did someone want to read an article?

http://www.threesports.com/newseventdetails.php?id=329
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Old 08-08-06, 04:41 PM
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Unless you're losing a TT by .035 seconds I wouldn't waste your money on ceramic bearings
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Old 08-08-06, 04:42 PM
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Ceramic bearings are amazing in skateboard wheels. So I'm not going to write them off. I can see in a TT how they'd be affective in hubs, but not so much in the BB.
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Old 08-08-06, 05:01 PM
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I wouldn't write 'em off either. Maybe they're the next cat's meow. But for the life of me I can't think of a worse place to get terribly whipped up over gram shaving. It's at the bottom of the bike's CG and doesn't present any real rotational inertia to overcome. For virtually every rider here I can't see it delivering a worthwile performance improvement. Sure as hell not me.
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Old 08-08-06, 05:04 PM
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Originally Posted by DocRay
Ceramic bearings give a neglible decrease in rolling resistence.
Cees Beers, as you can read in that thread, kinda pulled those figures out of his ass.
They will last longer (assuming they don't crack), but they are far too expensive to justify.
Yep, definitely take what he has to say with a grain of salt. That is unless you trust his unconfirmable findings because the tests can't be published due to a) its secret and he signed some rediculous NDA b) "cost [him] lots of money," or c) some other asinine reason. Cees seems to be one of those guys that loves talking but doesn't say much of value.
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Old 08-08-06, 05:46 PM
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Ceramic bearings give a neglible decrease in rolling resistence.
sorry, I have to disagree with this. I've never read a test on this matter, but let me share my real world experience.

I've been using ceramic skateboard bearings for over 3 years now, and I couldn't imagine going back. Look - if you take a skateboard wheel and put it on an axle (virtually the same set-up as two sealed bearings in a hub) and spin it - it will spin for 5 minutes. If you do this with a non-cermic bearing(s) it will spin for roughly a quarter of the time. That is a huge huge difference in rolling resistance. Now, the argument should not be weather or not ceramic bearings have dramatically decreased rolling resistance (they do. try my experiment for $140 if you like), but rather, weather this decreased rolling resistance will translate in to anything. In cycling there are just so many variables, the cost of ceramic bearings doesn't justify the performance benifits. If I were a pro TT'ing, I would bend over backwords to get them, but for you and I, we should just train more / work on form / glue that number down / wear more aero equipment / etc..
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