The bearing races and balls are made from ZrO2 (Zirconia) making the bearing a lot lighter, faster and more energy efficient with reduced friction. The cage and seals are made in PTFE to maintain the low weight & friction. Our full ceramic bearings come without grease because they are classed as self-lubricating.
We recommend our full ceramic bearings for track/velodrome riding, However if you consider yourself competitive and have a bike/wheelset set aside for racing then they could work very well for you.
Full ceramic bearings are a lot harder & tougher than steel bearings but at the same time they are more brittle & therefore susceptible to shock loads such as hitting pot holes (which we have a lot of in the UK) on the roads which could lead to cracks in the bearing races and eventually bearing failure.
If you would like to return an item you have purchased from us please contact us on 0113 256 5676 or firstname.lastname@example.org or Aire Bearings Ltd, 34 Bradford Road, Stanningley, Leeds, LS28 6DD.