Like many industries where technology helps sell products, there's always a lot of slightly dodgy marketing claims mixed up with science in the bike world. This excellent video from Hambini explains everything you need to know about the differences between steel and ceramic bearings from an engineer's perspective.
Ceramic bearings - or more accurately, the hybrid ceramic bearings that are found in bicycles - are often touted as having power-saving benefits due to them using extremely hard and round ceramic balls running in the steel races. They're often sold with big claims and a big price tag to match, but Hambini's video is an excellent explanation of the differences and takedown of some of the claims.
It also offers a solid engineering explanation of how bearings work and what creates power-sapping friction within them. If you've got a few minutes to geek out on bearings - and potentially save yourself quite a bit of cash if you were thinking what you should replace worn bearings with - then it's well worth a watch.
Hambini also does replacement bottom brackets, tools and bearings (none of which are ceramic, strangely enough) at his website, check it out below.
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