Specialized Tarmac SL8 Pro Shimano Ultegra Di2 Bicycle – The fastest road bike in the world
Discover the Specialized Tarmac SL8 Pro Shimano Ultegra Di2, the fastest road bike ever made. Designed with a perfect combination of advanced aerodynamics, ultralight weight, and unmatched ride quality, this bike marks a turning point in road cycling. After more than twenty years of development and eight evolutionary generations, the Tarmac SL8 is not only the fastest Tarmac ever but also the highest performing road bike on any terrain.
Unprecedented aerodynamic performance
Every detail of the Tarmac SL8 is optimized for speed: thanks to Speed Sniffer technology, the new steerer tube profile minimizes aerodynamic drag. The design leverages the new UCI rules to create the most aerodynamic seatpost ever made by Specialized.
Ultralight 685-gram frame
With a frame made of FACT 10r carbon weighing only 685 grams, the Tarmac SL8 is 15% lighter than its predecessor (SL7) and lighter than any other World Tour model*. It is built to reach the UCI weight limit with a fully aerodynamic setup.
*Except for the 585g Aethos used by Kasper Asgreen in a Tour de France stage.
Responsive ride and high comfort
The Tarmac SL8 improves the stiffness-to-weight ratio by 33% compared to the SL7. It is more precise, more responsive, and more comfortable in the saddle. Thanks to Rider-First Engineering technology, every size guarantees the same ride quality and optimal performance. With a 6% increased compliance, it better absorbs vibrations while maintaining race-level responsiveness.
Universal design: Beyond Gender
Specialized designs bikes for cyclists, not for gender. Individual differences are more relevant than those between men and women. The Tarmac SL8 is designed to give an advantage to every cyclist, with no compromises.
Ready to race: Shimano Ultegra Di2 + Roval Rapide CL III
The Pro version mounts the electronic group Shimano Ultegra Di2 R8100 with integrated power meter 4iiii Precision 3+, wheels Roval Rapide CL III tubeless-ready, integrated cockpit and saddle Power Pro Mirror. Everything needed to compete at the highest levels, right from the start.
Technical Specifications – Specialized Tarmac SL8 Pro Shimano Ultegra Di2
Frame
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
Brakes
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 with quick link
Crankset: Shimano Ultegra R8100 with 4iiii Precision 3+ power meter, 52/36t
Bottom bracket: Shimano Threaded BSA BB
Wheels and Tires
Front wheel: Roval Rapide CL III, Tubeless, 21mm internal carbon rim, 51mm profile, DT350 hub, 18 DT Swiss Competition Race spokes
Rear wheel: Roval Rapide CL III, Tubeless, 21mm internal carbon rim, 48.5mm profile, DT350 hub, 24 DT Swiss Competition Race spokes
Tires: S-Works Turbo TLR Race Tire, 700x28c (front and rear)
Inner tubes: Standard 700 x 20-28, Presta valve 80mm
Cockpit
Handlebar: Roval Rapide Cockpit, integrated handlebar/stem
Handlebar tape: Supacaz Super Sticky Kush
Saddle: Power Pro Mirror, Hollow Ti rails
Seatpost: S-Works Tarmac SL8 Carbon, FACT Carbon, 15mm offset
Seat collar: Tarmac integrated wedge
Accessories
Product data
Note Well
Technical specifications may change without notice depending on component availability.
Product images are purely indicative and may not exactly reflect the described features.
Pushed to the limit of performance, the Specialized Tarmac SL8 Pro is the ultimate choice for those seeking speed, precision, and cutting-edge technology.
Do you want to receive your bike ready for use? Don't forget to add the bike assembly service at the time of purchase! Discover all the details here: Francesconi bike assembly
A Complete Guide to Bike Sizes
Foreword: Not all bike sizes are the same
Each type of bike has a specific frame and often uses a different size scale. For example, a road bike with a 54cm frame might be considered a medium size by one brand, but a large by another.
Bicycle adjustment margins
Some types of bikes, like gravel bikes, offer a wide range of adjustments, adapting to different body types. Other models, however, have limitations in this regard. This is an important aspect to consider.
How to use size charts
We've created a simple guide to help you find the right bike size:
- Check out our size charts for each bike type.
- Learn more with specific tips to help you make the right choice.
Size Charts: Find Your Perfect Bike
Gravel and road bikes
Sizes are based on the length of the top tube (in cm), which determines the reach of the bike.
| Cut
|
Recommended height
|
Horizontal tube length
|
| XS |
Up to 157 cm |
48-50 cm |
| S |
157-167 cm |
50-53 cm |
| M |
168-178 cm |
53-56 cm |
| THE |
178-185 cm |
56-58 cm |
| XL |
Over 185cm |
58-62 cm |
For gravel, measurements may vary slightly due to different geometries, but remain similar.
Mountain bike
MTBs are measured in inches, based on the seat tube.
| Cut
|
Recommended height
|
Size (in inches)
|
| XS |
Up to 157 cm |
14"-16" |
| S |
157-167 cm |
15"-17" |
| M |
168-178 cm |
16"-19" |
| THE |
178-185 cm |
18"-20" |
| XL |
Over 185cm |
20"-23" |
Sizes also vary depending on the type of MTB: full-suspension , hardtail or fat bike .
Children's bikes
The size depends on the size of the wheels, often associated with age:
| Age
|
Wheel Size
|
| 1-3 years |
12" |
| 2-4 years |
14" |
| 4-6 years |
16" |
| 5-8 years |
20" |
| 8-10 years |
24" |
| Over 10 years |
26"/27.5" |
What to do with half measures?
If you are between two sizes:
-
Comfort : Choose the larger size.
-
Performance : Go for the smaller size.
Final tips for choosing
-
Consult the manufacturer's instructions : Always check the brand's guidelines.
-
Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
-
Test the bike : If possible, test the model you intend to purchase.
