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@gbj_tester
I was taking the piss, I don't need 1/100th of a second in a match sprint since I only ride them for fun during training sessions. I'm aware of most of the time saving methods since I've been time trialling for over 30 years now. Don't fancy full ceramics in wheel bearings, due to the shock loading, and also because the time gains are poor value for money even when you buy from an industrial bearing factor, rather than paying the 500% sucker tax that bike manufacturers add. I've got ceramic hybrid bearings in my dérailleur pulleys on my best geared bike though, since that looks like an ideal place for them. SiO2 is sand/quartz/glass, not a bearing ceramic suited to bicycle use. Silicon Nitride is the most common ceramic bearing, although Zirconium Oxide has some fans in other sports such as roller blading.