S-Works Aethos 2 Break the Rules Weighing only 595 grams, the S-Works Aethos 2 is the lightest production road bike frame in the world. However, that was not our main focus. We aimed to redefine the rules of cycling to deliver pure road bike enjoyment: the Aethos 2 is designed to almost disappear beneath you – it is incredibly agile, smooth, and refined. With increased tire clearance, enhanced components, and data-driven, fit-optimized geometry, even more riders can experience this outstanding ride quality. The Aethos 2 breaks the rules, driven by a passion for the ride.