Pseudo scientific cermaic vs conventional BB test

http://www.youtube.com/watch?v=42cMG2YA0GY

Does the fact the cranks with the ceramic bearings rotate for longer really mean very much? I mean, in the real world does it make a difference, or is it just more marketing BS?

On Le Tour maybe… but for fat execs, on carbon fibre on Beach Rd, with money to burn… hype!

Nice find… they look cool though!

i would have taken the pedals off for starters.
not sure it’s particularly conclusive given that the first BB had ceramic bearings as well.

I can make my cranks spin less times if I tighten my BB up!
My Ultegra BB spins more than the brand new D one.

Rigged I say!!!

On my road race bike we’ve upgraded everything to ceramic bearings. Bottom bracket, jockey wheels, hubs etc. It all adds up in the end and it does make a difference. The only bad thing is the longevity and they do need some maintenance.

There are a lot of more economical ways to make a difference, doing a brief 1 min google supports my engineers intuition on this eg. http://www.sheldonbrown.com/rinard/aero/formulas.htm

looking at other sources also suggests that even if you could eliminate half of the inefficiency of your drivetrain you might reduce 1 or 2% of the resistance your fighting against. intuitively you should probaly spend your $ on aerodynamic enhancements or faster tires.