Can you reinvent the derailleur on a mountain bike? Yes, you can: Cedric Eveleigh from Lal Bikes is doing away with the conventional rear derailleur. With the Supre Drive, the two functions of the rear derailleur - chain tensioning and shifting - are split up. A slimmed-down rear derailleur protected in the rear triangle of the frame takes care of shifting gears. The chain is tensioned via a sprocket above the bottom bracket. Predicate: Sensational!