S-Works Aethos 2 Break the rules Weighing in at just 595 grams, the S-Works Aethos 2 is the lightest production road bike frame in the world. However, that wasn't our main focus. We aimed to break the rules of racing to deliver pure cycling enjoyment: The Aethos 2 is designed to virtually disappear beneath you—it boasts incredible agility, smoothness, and refinement. With increased tire clearance, upgraded components, and data-driven, fit-optimized geometry, even more riders can now experience this exceptional ride sensation. Aethos 2 breaks the rules, driven by our love for the ride.