Last year, CeramicSpeed introduced an innovative bicycle drivetrain called DrivEn. It was a breakthrough - the ingenious design provided the world's best pedal-to-wheel power transfer. The drivetrain has caught everyone's attention, and now the developers have added a gearshift mechanism to it.
CeramicSpeed engineers split the main gear and placed it on a screw-threaded shaft instead of the old one-piece carbon tube. Now, at the command from the wireless switch on the steering wheel, that part of the gear that is not in contact with the gear wheel at the moment is shifted along the shaft forward or backward one step. The gear continues to move and when turning 180º the second half is free, and the first comes into contact with another level of the gear, to which the second part is then pulled. The gear again works as a whole, but at a different speed.
A single battery charge of the wireless switch provides a minimum of 1, 800 switches. All mechanisms are located inside the shaft tube, and therefore protected from the external environment. The number of gears in the modified version of DrivEn is 13, but no one bothers to make the front gear also separate, by multiplying their number. In general, as the author of the idea, Jason Smith, notes, the number of gears in this design is limited only by common sense.
By using bearings with an extremely low coefficient of friction, the developers of DrivEn managed to do without even lubrication. The modified transmission requires no maintenance other than recharging the batteries and is suitable for use on road and mountain bikes. It's too early to talk about the price - the product is ready for commercial use, but CeramicSpeed needs partners to launch it into production.