S-Works Aethos 2 Break the Rules Weighing only 595 grams, the S-Works Aethos 2 is the lightest mass-produced road bike frame in the world. However, that was not our primary focus. We aimed to redefine the boundaries of cycling by delivering pure riding pleasure: the Aethos 2 is designed to almost disappear beneath you – it is remarkably agile, smooth, and refined. With increased tire clearance, enhanced components, and data-driven, fit-optimized geometry, even more riders can now experience this exceptional ride quality. Aethos 2 breaks the rules, all for the love of riding.