First shown at Eurobike 2018, the CeramicSpeed Driven drivetrain concept replaces the chain with a carbon fiber driveshaft being turned by a toothed cog. At the back is a pie-platter sized disc with rows of teeth timed to a series of small bearings that engage to turn the rear wheel. You can read all about the design and tech here.
The project is still in the works, with three modified Cervelo P5 bikes in their Colorado offices. The latest update is that they’re “almost” able to shift under power. They’re rideable, but only in one gear.
UPDATE! Watch how it shifts and see the prototype mountain bike version in this post!
More recently, they introduced the offroad OSPW system. Word is it’s the first of more gravel, cyclocross and mountain bike systems to come, likely with their adjustable spring rate. That feature lets you set a lighter cage return tension to (slightly) reduce friction when you won’t be on super rough terrain.
One thing they glossed over in the introduction of the off-road OSPW parts was the revised narrow-wide tooth profile on the pulleys. As with anything they do, the design is optimized for performance, in this case to keep the chain on board even when you’re running lower return spring tension. But this particular design came about after reviewing other’s designs and the need to stay on the other side of some big brands’ patents.
Stay tuned for more news from them this year, and we’ll be setting up a call with their team to discuss friction and efficiency on the Bikerumor Podcast…so, got questions? Leave them in the comments here and we’ll be sure to ask!
