
This is in addition to gofastscottb's reply;
Ceramic bearings are the Holy Grail!! They are smoother, lighter, stiffer, corrosion resistant, harder and electrically resistant. They also diss heat quicker, reduce friction and wear, maintain a smooth and precision surface.... period!
They can be gotten in full ceramic or partial, with a steel race.
Made from Silicon Nitrate (Si3N4) which is similar to what's used on the space shuttle.
Here in NJ, Worldwide Bearings is the industries largest supplier for cars, bikes, atv's, snowmobiles and karts.
www.Worldwidebearings.com Dave @ 1-800-575-3220
www.bocabearings.com/doc/info/ABEC_Info.asp
Check them both out, especially you n/a guys, where every .001 counts and means the diff between a win/loss.
Hope this helps a bit.....