The Specialized Tarmac SL8 Expert Di2 is a road racing bike designed to deliver maximum speed on any route, thanks to a unique combination of aerodynamics, lightness, stiffness, and ride quality. After eight generations and over twenty years of development, the Tarmac project reaches its pinnacle with a platform capable of setting new performance benchmarks in road cycling.
Real speed, on every route
Speed does not depend on a single factor, but on the perfect balance between aerodynamics, reduced weight, power transfer, and comfort. Through advanced simulations based on real-world data, the Specialized Ride Science Team has demonstrated that the Tarmac SL8 is the fastest road bike on any terrain:
– 16.6 seconds faster over 40 km of flat terrain
– 128 seconds gained on the Milan–Sanremo route
– 20 seconds less on the Tourmalet climb
Aerodynamic development was concentrated in the most influential areas, resulting in a bike that is even more efficient than the Venge. The front zone has been completely redesigned: the fork steerer tube set back relative to the head tube reduces air resistance, while the most slender and aerodynamic seatpost ever created by Specialized optimizes airflow around the rider's legs.
To achieve the perfect balance between aerodynamics and minimum weight, the SL8 project draws inspiration from the Aethos construction philosophy. The frame weighs just 685 grams, approximately 15% less than the Tarmac SL7. The shapes of the seat tube, top tube, and rear triangle have been optimized to maximize structural rigidity while minimizing superfluous material.
The stiffness-to-weight ratio is improved by 33% compared to the previous model. The Tarmac SL8 is extremely precise in corners and responsive under effort, yet at the same time more comfortable, filtering 6% more vibrations from the asphalt. It retains the proven geometry of the SL7 and offers clearance for tires up to 32 mm, increasing stability, grip, and comfort over long distances.
The Tarmac SL8 is developed according to the Rider First Engineered™ philosophy, which takes into account the needs of the individual rider, not gender. Every size guarantees the same performance and the same ride quality. This version is equipped with the 12-speed Shimano Ultegra Di2 electronic groupset, tubeless-ready Roval C38 carbon wheels, and a Specialized cockpit with an integrated stem and Expert Shallow Drop aluminum handlebar.
Technical specifications:
Frame and fork
Frame: Tarmac SL8 FACT 10r Carbon, Rider First Engineered™, Win Tunnel Engineered, internal cable routing, BSA threaded bottom bracket, 12x142 mm thru-axle, flat mount disc brake
Fork: FACT 10r Carbon, 12x100 mm thru-axle, flat mount disc brake
Drivetrain
Shifters: Shimano Ultegra Di2 R8170
Front derailleur: Shimano Ultegra Di2 R8150
Rear derailleur: Shimano Ultegra Di2 R8150, 12-speed
Crankset: Shimano Ultegra R8100, 52/36T
Cassette: Shimano Ultegra 11-30T
Chain: Shimano XT M8100, 12-speed
Bottom bracket: Shimano threaded BSA
Brakes
Brakes: Shimano Ultegra BR-R8170, hydraulic disc front and rear
Wheels and tires
Wheels: Roval C38 carbon, 21 mm internal width, tubeless ready
Tires: S-Works Turbo 700x26 mm, 120 TPI, BlackBelt protection
Inner tubes: Turbo Ultralight, 48 mm Presta valve
Cockpit
Stem: Tarmac integrated stem, 6° angle
Handlebar: Specialized Expert Shallow Drop, aluminum, drop 125 mm, reach 75 mm
Bar tape: Supacaz Super Sticky Kush
Saddle and seatpost
Saddle: Body Geometry Power Expert
Seatpost: S-Works Tarmac SL8 FACT Carbon, 15 mm offset
Seat clamp: Tarmac integrated wedge
Accessories
SWAT stem headset spacers kit compatible with SL7 stem and Roval Rapide cockpit
Product details
Identifier: 221577
Weight: 7.18 kg (size 56, tubeless configuration)
Weights may vary based on color, size, and components. Specifications subject to change without notice.
