S-Works Aethos 2 Break the Rules Weighing only 595 grams, the S-Works Aethos 2 is the lightest production racing bike frame in the world. However, that was not our main focus. We aimed to break the rules of competitive cycling to deliver pure riding pleasure: The Aethos 2 is designed to feel invisible 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 enjoy this exceptional riding experience. The Aethos 2 breaks the rules, all for the love of the ride.