The CeramicSpeed DrivEn shaft-drive system produces 49% less friction than the deluxe Shimano Dura Ace chain-and-derailleur system. At the core of the prototype, the drivetrain is a spherical carbon fiber driver shaft, that gets to the single chainring at the front to 13-speed cassette on the back wheel.
Fitted on both ends of that shaft are units of very-low-friction ceramic ball bearings (you will discover a total of 21 of them), which work the teeth on the chainring along with the cassette cogs. Like the rider pedals on the bike, the bearings shift torque from the chainring by means of the shaft and into the back wheel, spinning it.
In its present style, DrivEn cannot shift between gears, although BikeRadar claims that this could certainly be handled with a wireless servo to shift the rear bearing system fore and aft in relation to the cassette. They accomplished a 99-percent effective multi-speed drivetrain while removing the chain and sophisticated back derailleur.
That performance is supposedly attained simply because that the system does away with the 8 points of slipping friction that are there in a normal drivetrain. DrivEn just acquired the 2018 Eurobike Award. There is currently no news on commercialization. And for the next venture into the shaft-drive bike concept, take a look at the Alpha Bike concept.