S-Works Aethos 2 Break the Rules Weighing just 595 grams, the S-Works Aethos 2 is the lightest mass-produced road bike frame in the world. However, that’s not our main focus. We aimed to redefine the rules of road cycling to provide pure riding pleasure: the Aethos 2 has been designed to almost disappear beneath you – it’s incredibly agile, smooth, and refined. With enhanced tire clearance, improved components, and data-driven, fit-optimized geometry, even more riders can now experience this exceptional ride feel. The Aethos 2 breaks the rules, driven by a love for riding.