Specialized Tarmac SL8 Expert 2025

Aerodynamics or lightness alone don’t win races: what matters is speed.
To achieve that speed, it’s necessary to create an uncompromising combination of aerodynamic efficiency, lightness, stiffness, and vibration absorption. Thanks to complex simulations using real‑world data, our Ride Science Team verified that the Tarmac SL8 is the fastest road bike on any course: 16.6 seconds over 40 km on flat terrain, 128 seconds faster on the Milano‑Sanremo route, 20 seconds faster on the Tourmalet climb.

AERODYNAMICS: We apply aerodynamics where it matters most, and in doing so we have created our fastest road bike ever — yes, even more aerodynamic than the Venge. The front end has been optimized for maximum benefit. The fork steerer tube is placed behind the front of the frame’s head tube to deliver much lower aerodynamic drag. Thanks to the new UCI rules, for the SL8 we were able to use the narrowest and most aerodynamic seatpost we’ve ever made, to ensure that turbulent air around the leg area can flow more easily toward the rear of the bike.

LIGHTNESS: To build the Tarmac SL8 and make it the most aerodynamic bike while meeting UCI minimum weight requirements, we were inspired by what we learned from the Aethos. The team produced a frame weighing 685 grams — 15% lighter than the Tarmac SL7 and lighter than any other WorldTour bike*. Focusing on maximal lightness in the down tube, seat tube, and rear triangle, we applied lessons learned from the Aethos project. The frame shapes respond so efficiently to stress that it was possible to reduce material thickness, eliminating anything superfluous. *Except for the occasion when Kasper Asgreen raced on our 585‑gram Aethos frame in a Tour stage.

RIDE QUALITY: The stiffness‑to‑weight ratio of the Tarmac SL8 is 33% better than the SL7. The Tarmac SL8 sets a new benchmark for handling: it is precise in the most demanding conditions and responds immediately and efficiently to pedal inputs. While the zones ensuring power transfer and steering precision are stiffer than ever, in the saddle the Tarmac SL8 is more comfortable, filtering 6% more road vibrations and allowing you to attack corners with a sensation of agility and balance unmatched in the road‑bike world. The new Tarmac SL8 retains the proven geometry of the SL7 model, with the same generous clearance for 32 mm tires, so that you can use a higher‑volume tire when needed.

BEYOND GENDER DIFFERENCES: In reality, there can be far more differences between two male cyclists than between a man and a woman. We design for the individual, and our philosophy is simple: don’t create differences where none exist. Every cyclist, whether man or woman, can benefit from the advantages of the Tarmac SL8. It’s time to go beyond.

The Tarmac SL8 Expert Di2 features the Ultegra Di2 groupset, carbon tubeless‑ready C38 wheels, an SL7 integrated stem with Specialized Expert Shallow Drop handlebars.

Specifications

FRAME

• Frame: Tarmac SL8 FACT 10r Carbon, Rider First Engineered™, Win Tunnel Engineered, Clean Routing, Threaded BB, 12×142 mm thru‑axle, flat‑mount disc

SUSPENSION

• Fork: FACT 10r Carbon, 12×100 mm thru‑axle, flat‑mount disc

BRAKES

• Front brake: Shimano Ultegra Hydraulic Brake

• Rear brake: Shimano Ultegra Hydraulic Brake

DRIVETRAIN

• Shifters: Shimano Ultegra Di2 R8170, hydraulic disc

• Front derailleur: Shimano Ultegra Di2 R8150, braze‑on

• Rear derailleur: Shimano Ultegra Di2 R8150, 12‑speed

• Cassette: Shimano Ultegra, 12‑speed, 11‑30t

• Chain: Shimano XT M8100, 12‑speed w/ quick link

• Crankset: Shimano Ultegra R8100, 52/36t

• Bottom bracket: Shimano Threaded BSA BB

WHEELS & TIRES

• Front wheel: Roval C38, 21 mm internal width carbon rim

• Front tire: S‑Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700×26 mm

• Rear tire: S‑Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700×26 mm

• Rear wheel: Roval C38, 21 mm internal width carbon rim

• Inner tubes: Turbo Ultralight, 48 mm Presta valve

COCKPIT

• Stem: Tarmac integrated stem, 6°

• Handlebar: Specialized Expert Shallow Drop, alloy, 125 mm drop × 75 mm reach

• Bar tape: Supacaz Super Sticky Kush

• Saddle: Body Geometry Power Expert

• Seatpost: S‑Works Tarmac SL8 Carbon seatpost, FACT Carbon, 15 mm offset

• Seatpost collar: Tarmac integrated wedge

ACCESSORIES

• SWAT: Stem headset spacers kit for SL7 stem & Roval Rapide cockpit use

WEIGHT

• Weight: 7.18 kg (15 lb, 13.3 oz)

• Measured size: 56

The manufacturer reserves the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. The prices shown are the manufacturer's suggested retail prices.