Just wondering, has anybody here upgraded their fixed gear bike's botom bracket to a ceramic one? I'm curious if it makes a difference in bike weight and if it spins any better. FSA makes a cool looking Cermaic BB.

I got this off somebody's review:

---They're harder.
---They're 60% lighter. A 1/4-inch (6.35-mm) steel bearing weighs about 1 gram. A Dura-Ace rear hub uses 18 bearings that size. 18g x 60% = 10.8g, a savings of 7.2g. Not bad.
---They withstand higher temperatures. Ceramic bearings can handle heat up to 2,552F degrees (1,302C). That's important if your sprint is so hot it can melt steel.
---They're rounder. Grade 3-5 ceramic balls mean accurate roundness to 0.00003-0.00005 inches. The standard Grade 25 chrome steel bearings used by Shimano and Campagnolo in their best equipment are accurate only to 0.00025 inch. Check this with your tape measure and you'll see.
---They withstand high loads as well as high speeds. One manufacturer actually compared this feature to the ceramic tiles of the Space Shuttle upon reentry. I think it means you may need a fireproof suit for that next big descent.
---They reduce friction by at least 40%. That's a pretty impressive figure, but I could not find proof of it anywhere.
---They last 3-5 times longer. If you overhaul your hubs every year, this means you need to replace the bearings 3-5 times less often. Sounds good to me.