S-Works Aethos 2 Break the Rules Weighing just 595 grams, the S-Works Aethos 2 is the lightest production racing bike frame in the world. However, our focus was not solely on weight. We set out to break the rules of competitive cycling to deliver pure riding pleasure. The Aethos 2 is designed to virtually disappear beneath you—it is incredibly agile, smooth, and refined. With increased tire clearance, enhanced components, and a data-driven, fit-optimized geometry, even more riders can experience this outstanding riding sensation. The Aethos 2 breaks the rules, driven by a passion for the ride.