2026 | Aethos 2 Frameset

Complete Builds at Just 5.9kg Thanks to Flow State Design. Aethos began with a moment of human insight: frames “breath” under load. That subtle rhythm revealed how force moved. We fed this into our supercomputer, evolving tubes into sculpted forms. The shape itself delivered stiffness, delivering UCI illegal 5.9kg builds and more responsiveness. The result wasn’t just a more perfect ride, it was a new way of making bikes—Flow State Design.

The breakthrough that made Aethos (and Tarmac SL8 and Crux bikes) possible started not with carbon or code, but with a moment of human revelation. While studying frame behavior in our test facility, Specialized Science Club engineers noticed a distinct pattern in how the frames “breathed” under load. This subtle, rhythmic deformation revealed how force moved through the structure. It wasn’t noise. It was information. That pattern became a prompt. We fed it into our supercomputer, along with the largest mechanical test dataset on the planet, compiled over decades of real-world testing. The result was a visually subtle, yet radically significant evolution to traditional round tubes into sculpted forms, precisely tuned to optimize energy flow through the structure. We call it Flow State Design. By optimizing shape instead of adding material in layering stiffness, we eliminated traditional ‘stiffness’ layers of carbon fiber. The outcome is a lighter frame with better ride quality, improved structural integrity, and real performance gains. This 595 gram frame can withstand over 100,000 cycles of 2,377watts* being pushed through the pedals - well beyond any ‘industry standard’. Flow State is that rare moment when rider and bike dissolve into motion. Time stretches. Effort fades. Every movement clicks. Flow State Design exists to create products that bring this feeling to life on every ride. Equivalent to *170mm cranks at 100rpm.

To stay under 600 grams and still deliver a ride this sublime, our engineers took our most premium carbon recipe - FACT 12r - and then optimized the layup to an entirely new level. If Aethos 1 was a 10/10, Aethos 2 pushed it to 12. It took countless iterations refining each FACT 12r ply by fractions of a millimeter to unlock a ride closer to perfect than anything that came before.

Decades of Body Geometry data, now tuned into a fit that works for more riders than ever. We refined the fit and geometry using data from over 100,000 Body Geometry fits to make long days in the mountains feel even better. Climb faster. Descend harder. Ride longer. You get precise handling in a more versatile and confidence-inspiring package.