Specialized Tarmac SL8 Expert Ultegra Di2 Carbon Road Bike 2025 in Gloss White/Black Metallic

Nothing is faster than the Tarmac SL8 thanks to a combination of aerodynamics, lightweight, and ride quality previously thought impossible.

After eight generations and over two decades of development, it’s more than the fastest Tarmac ever – it’s the world’s fastest race bike. Your legs up for it?

Aerodynamics or lightweight alone don’t win races – speed is what matters. Delivering that speed requires creating an uncompromising combination of aerodynamics, lightweight, stiffness, and compliance. Through race simulations using real-world data, Specialized’s Ride Science team knows the Tarmac SL8 is the fastest race bike ever made on the routes that matter – 16.6 seconds faster over 40km, 128 seconds faster over Milan San Remo, 20 seconds faster over the legendary Tourmalet climb.

Key Features & Benefits

• Aero in everything:Utilizing new UCI rules, the Tarmac SL8 has the narrowest, most aero seat post Specialized have ever made ensuring fast-moving, dirty air around the legs can flow back more cleanly.
• Massive gains in stiffness-to-weight:The bike is stiffer at the pedals, more precise at the bars, and combines it with a compliant ride in the saddle that sets a new benchmark for race bike comfort.
• Shimano Ultegra Di2 Groupset:Exceptional performance electronic shifting with a wide range cassette.

Full Specification

• Frame:Tarmac SL8 FACT 10r Carbon, Rider First EngineeredTM, Win Tunnel Engineered, Clean Routing, Threaded BB, 12x142mm thru-axle, flat-mount disc
• Fork:Tarmac SL8 FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc
• Number of Gears:24
• Gear Shifters:Shimano Ultegra R8170, hydraulic disc
• Chainset:Shimano Ultegra R81000
• Chainrings:52/36T
• Rear Cassette:Shimano Ultegra, 12-speed, 11-30t
• Chain:Shimano Ultegra, 12-speed
• Front Derailleur:Shimano Ultegra R8150, braze-on
• Rear Derailleur:Shimano Ultegra Di2 R8150, 12-speed
• Bottom Bracket:Shimano Threaded BSA BB
• Pedals:Not supplied:Shop pedals here
• Front Wheel:Roval C38, 21mm internal width carbon rim
• Rear Wheel:Roval C38, 21mm internal width carbon rim
• Front Tyre:S-Works Turbo, folding bead, 700x26mm
• Rear Tyre:S-Works Turbo, folding bead, 700x26mm
• Brakes:Shimano Ultegra Di2 R8170, hydraulic disc
• Handlebars:Specialized Expert Shallow Drop, alloy, 125mm drop x 75mm reach
• Handlebar Tape:Supacaz Super Sticky Kush
• Headset:No info available
• Stem:Specialized Tarmac integrated stem, 6-degree
• Saddle:Body Geometry Power Expert
• Seatpost:S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset
• Accessories:Shimano Di2 Charger
• Weight:56cm – 7.20kg (15 lb, 14 oz)