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 Specd with Shimanos Ultegra Di2 that delivers clean crisp shifts and Rovals Alpinist wheels mated to DT Swiss 350 hubs and your left with a no-fuss build that delivers mile after mile