Tarmac SL8 Expert - Ultegra Di2

£6,000.00
10 days free insurance available

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Experience unrivalled speed and agility with the Specialized Tarmac SL8 Expert - Ultegra Di2. A fusion of advanced aerodynamics and lightweight design makes it the fastest race bike globally. Dominate the road with precision and style.

Tarmac SL8: The Fastest Race Bike on the Planet

The Tarmac SL8 is more than just the fastest Tarmac ever—it’s the world’s fastest race bike. Through a perfect combination of aerodynamics, lightweight design, and unmatched ride quality, we've crafted a machine that defies expectations. After over two decades of development and eight generations of refinement, it’s here: the fastest bike on any road. Are you ready to push the limits?

Speed Above All

Aerodynamics and lightweight are important, but speed is the ultimate goal. To unlock that speed, we’ve integrated aerodynamics, stiffness, lightweight construction, and compliance into one high-performance package. Through real-world race simulations and data, our Ride Science Team confirms that the Tarmac SL8 is faster than anything that’s come before it. On the courses that matter, it delivers:

  • 16.6 seconds faster over 40km
  • 128 seconds faster over Milan-San Remo
  • 20 seconds faster up the legendary Tourmalet climb

Aero Where It Counts

We’ve put aero where it truly matters—the leading edge. The result? The Tarmac SL8 is now the most aerodynamic road bike we’ve ever made. In fact, it’s even more aero than the Venge. With the Speed Sniffer nose cone, we’ve optimised airflow to give you a clear advantage. By shifting the steer tube back, we’ve created a much sharper, more efficient head tube, reducing drag significantly. And with the latest UCI rules in mind, the Tarmac SL8 boasts the most aero seatpost we’ve ever designed, ensuring that turbulent air around your legs flows cleanly. Victory has never smelled so sweet.

Featherweight with Maximum Aero Efficiency

The Tarmac SL8 is engineered to hit the UCI minimum weight while maintaining a full aero setup. The result is a jaw-dropping 685g frame15% lighter than the Tarmac SL7 and lighter than anything else on the World Tour. Thanks to Aethos-inspired design principles, we’ve reduced weight without compromising performance, ensuring maximum efficiency in the down tube, seat tube, and rear triangle. The frame’s shape carries the load so effectively that additional carbon stiffness layers are unnecessary. (Unless, of course, you count the time Kasper Asgreen raced our 585g Aethos frame during a Tour stage.)

Race-Ready Performance, Ride-Ready Comfort

With 33% more stiffness-to-weight than the SL7, the Tarmac SL8 takes legendary handling and precision to the next level. It’s stiffer at the pedals, more responsive at the bars, and yet still offers a compliant ride that’s unparalleled in the world of race bikes. Thanks to Rider-First Engineering, every rider—no matter your size—experiences the same exceptional handling and ride quality. The Tarmac SL8 delivers 6% more compliance, smoothing out rough roads and providing a supple ride that’s rare in the race bike category. Plus, with the same 32mm tire clearance as the SL7, you have the flexibility to run higher-volume tires for added comfort or traction when needed.

Beyond Gender

The days of gender-specific bikes are over. Tarmac SL8 is designed to offer performance for all riders because gender alone doesn’t provide enough data to specialise. There can be more variance between two male riders than between a male and female rider. It’s time to break the outdated gendered bike moulds. With Tarmac SL8, every rider gets the next-level advantage—no matter who you are.

Tarmac SL8 Expert Di2: Performance Packed and Ready to Race

The Tarmac SL8 Expert Di2 is built for those who demand exceptional performance at a more accessible price point. Equipped with a full Shimano Ultegra Di2 groupset, C38 carbon tubeless-ready wheels, and a Specialized Expert Shallow Drop alloy handlebar paired with an SL7 stem, this bike is all about race-ready precision and performance.


With the Tarmac SL8, you’re not just riding any race bike—you’re riding the fastest race bike ever made. Are your legs ready to take it to the next level?

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
Crankset Shimano Ultegra R8100
Chain Shimano Ultegra, 12-speed
Cassette Shimano Ultegra, 12-speed, 11-30t
Shift Levers Shimano Ultegra R8170, hydraulic disc
Front Derailleur Shimano Ultegra R8150, braze-on
Rear Derailleur Shimano Ultegra Di2 R8150, 12-speed
Front Brake Shimano Ultegra Di2 R8170, hydraulic disc
Rear Brake Shimano Ultegra Di2 R8170, hydraulic disc
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
Handlebars Specialized Expert Shallow Drop, alloy, 125mm drop x 75mm reach
Saddle Body Geometry Power Expert
Seat Post S-Works Tarmac SL8 Carbon seat post, FACT Carbon, 15mm offset
Seat Binder Tarmac integrated wedge
Inner Tubes Turbo Ultralight, 48mm Presta valve
Chain Rings 52/36T
Bottom Bracket Shimano Threaded BSA BB
Stem Tarmac integrated stem, 6-degree
Tape Supacaz Super Sticky Kush

Please note: Manufacturers can sometimes change the specification of the products from time to time.

Lifetime warranty* to the original owner against structural defects in material or workmanship on ALL models of Specialized-branded frames and forks

  • Includes seatstays and chainstays on full-suspension bikes
  • Does not include suspension forks and suspension parts
  • Does not include paint and graphics (these are covered below)

* Register your bike, frameset, or Roval wheels within the first 90 days of purchase for a lifetime warranty to the original owner.

Read the full warranty here

When you purchase a bike from Specialized Concept Stores, you'll receive a complimentary tune-up service at at your nearest Concept Store within 6 weeks of bike delivery.

This free service is designed to ensure that the bike you've chosen is operating optimally and to make any necessary adjustments, such as cable stretching, common with new bikes.

However, if you encounter any issues with your bike at any point, we strongly advise you to cease riding and promptly book your bike in for its complimentary service to ensure your safety and riding pleasure.

When you receive your bike, you'll be pleasantly surprised at how effortless it is to get it road-ready. We've designed the assembly process to be as straightforward as possible, so you can start enjoying your new ride without delays.

All you need to do is install the handlebars, pedals, and wheels. It's a quick and hassle-free process that requires no advanced technical skills. Our user-friendly instructions and included tools will guide you through each step, ensuring a smooth and secure assembly.

Whether you're an experienced cyclist or new to bike assembly, you can trust that the process will be a breeze. Within no time, your bike will be fully assembled, and you'll be ready to hit the road, trail, or bike path with confidence.

We offer 10 days free cover with all new bikes purchased, provided by our insurance partner VeloLife. You will be covered for the first 10 days of ownership against theft and accidental damage, so you can purchase with confidence.

Give yourself the comfort of no obligation free insurance, make sure you have peace of mind from the moment you leave the store. If anything happens to the bike in the first 10 days of ownership, know you are covered!

Cycle to Work Scheme: Affordable Riding for UK Employees

Unlock a cost-effective way to own the bike of your dreams through the Cycle to Work Scheme. This initiative, available to employees in the UK, lets you enjoy the benefits of cycling while saving on your bike purchase.

With the Cycle to Work Scheme, you can use your pre-tax salary to acquire a brand-new bicycle and essential cycling accessories. This means significant savings for you, as your salary sacrifice reduces both your income tax and National Insurance contributions.

The process is seamless: Choose the bike that suits your needs and budget from our extensive range. Your employer will then set up a salary sacrifice arrangement, spreading the cost of your bike over a specified period, typically 12 to 18 months.

Once the salary sacrifice period ends, you have the option to own the bike outright for a nominal fee, ensuring you get to keep and enjoy your trusted two-wheeled companion for years to come.

Experience the freedom of cycling, save money, and reduce your carbon footprint with the Cycle to Work Scheme. Join countless UK employees who have already embraced this eco-friendly and wallet-friendly way of commuting.