The Aethos line promises three things-exceptional light weight, perfectly-balanced ride characteristics, and undeniable style-and this Aethos pro is no exception. Aethos: Billions of calculations in the pursuit of one thing-the perfect ride. Spec’d with Shimano's Ultegra Di2 that delivers clean, crisp shifts and Roval’s Alpinist wheels mated to DT Swiss 350 hubs and your left with a no-fuss build that delivers, mile after mile.