The only number that decides a race is the one on the clock at the finish line, and Specialized built the Tarmac SL9 around exactly that idea. Rather than chasing an isolated wind-tunnel figure or scale reading, the engineering team optimized the entire platform around what it calls Time to Finish—a race-simulation metric that folds aerodynamics, total system mass, rolling resistance, mechanical efficiency, rider power, terrain, and wind into a single measure of how quickly a bike completes a real course. This Expert build brings that platform to a FACT 10r carbon frame paired with Shimano's Ultegra Di2 groupset, offered in Gloss Black/Silver Dust.

The frame carries the aero work that defines the SL9. Every tube was re-sculpted drawing on Tarmac SL8 learnings and decades of aero research, with a dropped down tube working alongside the Speed Sniffer nose cone and Flow Fork, whose twisted-blade design smooths airflow at the front end. A Win Fin channels air around the rear, and a deeper aero seatpost profile cuts drag in the zone most disrupted by pedaling. Specialized claims the SL9 is the most aerodynamic road bike it has ever tested.

Rider First Engineered construction tunes stiffness, compliance, and handling to each frame size, so a rider on a 44cm frame gets the same responsiveness and ride feel as someone on a 61cm. The geometry stays true to the Tarmac's proven race position—a sporty stack-to-reach ratio and 410mm chainstays across all sizes for direct, crisp acceleration out of corners. The frame runs a threaded BSA bottom bracket, a 12x142mm thru-axle, flat-mount disc, and a UDH dropout for future drivetrain compatibility.... Read More