The Tarmac SL8 is built to be the fastest race bike ever, combining unmatched aerodynamics, featherweight construction, and exceptional ride quality. After decades of development, its advanced design is proven through real-world race simulations, delivering huge time savings on climbs, sprints, and long-distance efforts. Every element—from the Speed Sniffer nose cone to the ultra-narrow aero seatpost—is engineered to reduce drag and maximise speed where it matters most.

Despite its aerodynamic gains, the SL8 remains incredibly light thanks to structural efficiencies inspired by the Aethos, achieving a 685g frame while boosting stiffness-to-weight by 33% compared to the SL7. Rider-First Engineering ensures every size offers the same precision handling and surprising comfort, with geometry and tyre clearance that maintain versatility. Paired with a full Shimano 105 Di2 groupset and DT R470 wheels, the Tarmac SL8 Comp Di2 brings top-tier performance to more riders than ever.

Key Features

• Ultra-aero design with Speed Sniffer nose cone and narrow seatpost reduces drag for maximum speed
• 685g frame inspired by Aethos delivers class-leading lightweight efficiency with aero performance
• 33% improved stiffness-to-weight for sharper handling, responsiveness, and power transfer
• Rider-First Engineering and 32 mm clearance provide consistent comfort and race-ready control
• Shimano 105 Di2 groupset and DT R470 wheels offer reliable electronic shifting and high performance

Specifications

Frameset

• Frame: Tarmac SL8 FACT 10r Carbon, Rider First Engineered™, Win Tunnel Engineered, Clean Routing, Threaded BB, 12x142mm thru-axle, flat-mount disc
• Fork: FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc

Wheels

• Rims: DT Swiss R470 rim, 20mm internal width, tubeless ready, 24h, Specialized full sealed bearing thru axle hub, centerlock disc, DT Swiss Champion 14G stainless steel spokes, DT Swiss brass nipples.
• Tyres: S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x26mm

Drivetrain

• Crankset: Shimano 105 R7100, 52/36t
• Shifters: Shimano 105 Di2 R7170, 12-speed
• Rear Derailleur: Shimano 105 Di2 7150
• Front Derailleur: Shimano 105 R7170, braze-on
• Chain: Shimano SLX, M7100, 12-speed
• Cassette: Shimano 105, 12-speed, 11-34t
• Bottom Bracket: Shimano Threaded BSA BB

Components

• Handlebar: Specialized Shallow Drop, 6061, 70x125mm, 31.8mm clamp
• Stem: Tarmac integrated stem, 6-degree
• Grips: Supacaz Super Sticky Kush
• Brakes: Shimano 105 Hydraulic Brake
• Saddle: Body Geometry Power Sport, steel rails
• Seatpost: S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset

Tarmac SL8 Sizing