99 % efficiency of CeramicSpeed drive shaft drive train

The first mover and market leader of ceramic bearings, Danish company CeramicSpeed, has developed a drive shaft for multi speed drive trains in cooperation with University of Colorado.

Compared to the best available multi speed drive train in chain and derailleur design the number of sliding points has been reduced from 8 to 3 and hence the loss of power through friction is reduced to 49 %.

Furthermore, CeramicSpeed take advantage of their own bearings and offers the choice 13 different gears on the prototype bike.