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CeramicSpeed’s mad chainless Driven drivetrain now changes gear, and it’s for mountain bikes too. Still a concept, but more promising than ever. Last week CeramicSpeed claimed that its chainless Driven drivetrain concept was the most aero in existence. Now, the brand has revealed an actual shifting mechanism which uses a wirelessly controlled ‘split pinion’ to move across the concentric circles of gear teeth that make up the flat ‘cassette’ mounted to the rear wheel. Developed with help from the Univers
