Ceramic wheel bearings

Thanks, Dave just what I needed. The other sites I tested were far less cycle specific. I ordered 2 x 6901's and paid $60 to include postage and insurance through Paypal. All ceramic are about $129, on another site.

I've used this supplier before: http://www.enduroforkseals.com/index.html

They were good.

The bearings are size 6801, and the letters refer to the seal types.

Ceramic is harder than steel, so having steel races means that eventually you'll wear the races before the bearings. So the very best is to have both the races and bearings ceramic, however it's almost needlessly expensive, hybrids (ceramic balls, steel races) are a significant improvement over all steel bearings. And it's reasonably unlikely that parts will ever get to the point of being fully worn before being replaced.