The Specialized Tarmac SL9 S-Level redefines what it means to be the fastest road bike ever made. Rather than chasing isolated metrics like lowest drag or lightest weight, Specialized engineered this machine around a single, measurable outcome: Time to Finish-the actual elapsed time to complete a real-world race course accounting for everything that affects speed simultaneously. Every design decision, every aerodynamic refinement, and every gram of carbon has been optimized to produce the lowest possible race time on the courses where championships are decided. The breakthrough is the Equation of Speed, a physics-based model that calculates how rider, bike, and route combine to determine finishing time. This philosophy transcends traditional climbing bike versus aero bike debates-the SL9 is engineered as a single platform for all rider types and race scenarios. The FACT 10r carbon frame achievies extreme lightness through Flow State Design, where engineers studied deformation patterns under load and used advanced computational analysis to optimize tube shapes for structural efficiency rather than simply adding material. This frame matches the exact stiffness and compliance targets of its predecessor while delivering measurable aerodynamic gains. Every surface has been reshaped for speed. The Speed Sniffer head tube uses a patented offset steerer design that reroutes the brake cable, reducing the head tube by 4mm and frontal area by 10 percent. The dropped down tube keeps disturbed air from spilling into the frame. The Flow Fork twists outward to guide airflow efficiently, while the Win Fin rear triangle, redesigned based on real-world race observation where breakaway riders carry one bottle, not two, saves additional watts. The S-Works Rapide Post features the thinnest seatpost profile Specialized has ever made, optimized through sixth-generation Moving Leg Mannequin testing. Shimano Dura-Ace Di2 electronic drivetrain delivers instantaneous, precise shifting with crisp responsiveness across all conditions, while Roval Rapide CL III wheels provide the perfect balance of aerodynamic efficiency and low rolling resistance. This is a race-winning machine engineered to excel across all terrain and race scenarios. Key Features Frame - Specialized FACT 10r Carbon Drivetrain - Shimano Dura-Ace Di2 electronic Wheelset - Roval Rapide CL III