Cervélo S5 Ultegra Di2 Bicycle – High-End Aero Road Bike
The Cervélo S5 Ultegra Di2 bicycle is one of the most advanced aero road bikes in the world, designed to dominate on the road with exceptional aerodynamic performance and surprising lightness. It represents the pinnacle of modern cycling engineering, the result of Cervélo’s experience at the highest levels of professional cycling.
From Wout van Aert’s victories to winning the Green Jersey, up to the Pink Jersey worn by Simon Yates, the Cervélo S5 has proven its worth on the most prestigious international stages.
Optimized Aero Performance
The new Cervélo S5 is over 6 Watts faster than the previous version, with a weight saving of 124 grams. Aerodynamics have been improved especially in the front area, with a more pronounced fork and steerer tube. The new HB19 integrated monobloc handlebar with V design optimizes airflow and riding position.
Thanks to the “Plus-Four” concept, the top part of the handlebar is 4 cm narrower than the lower part, promoting a more aerodynamic posture in the tops and stability in sprints and descents. All fully compliant with UCI regulations.
Reserve 57 wheels|64 – Turbulent Aerodynamics
Developed jointly by Cervélo and Reserve, the new wheels Reserve 57|64 Turbulent Aero are perfectly integrated into the S5 frame design. The rear asymmetry fits the seat tube, creating a clean and stable airflow, even in crosswinds. This set is 3 Watts faster than the previous 52|63, maintaining the same weight.
Technical Specifications
Transmission Group
Front Derailleur: Shimano Ultegra R8150
Rear Derailleur: Shimano Ultegra R8150
Cassette: Shimano Ultegra R8100 12V, 11-34T
Shift/Brake Levers: Shimano Ultegra R8170
Crankset: Shimano Ultegra R8100, 52/36T
Bottom bracket: FSA BBright, thread together for 24 mm axle
Chain: Shimano M8100
Braking system
Cockpit and Components
Handlebar: Cervélo HB19 Carbon integrated monoblock
Saddle: Selle Italia NOVUS BOOST EVO SuperFlow Ti
Seatpost: Cervélo SP34 Carbon
Power meter: 4iiii Precision Pro GEN3+ Dual Sided
Frame and Geometry
Fork: Cervélo All-Carbon, Bayonet S5
Headset: FSA IS2 (1-1/8 x 1-3/8, 36° x 45°)
Wheels and Tires
Front wheel: Reserve 57TA with DT Swiss 240 hub, 12x100mm, 24 spokes, Centerlock, tubeless
Rear wheel: Reserve 64TA with DT Swiss 240 hub, 12x142mm, HG freehub, 24 spokes, Centerlock, tubeless
Tires: Vittoria Corsa Pro TLR G2.0 700x29c
Thru Axles
Front: Cervélo Aero Thru Axle M12x1.5mm, 122mm
Rear: Cervélo Aero Thru Axle M12x1.0mm, 169mm
Included accessories
Note Well
Technical specifications may change without notice depending on component availability.
Product images are for illustrative purposes only and may not perfectly reflect the described features.
Perfect for those looking for an aerodynamic road bike, light and precise, the Cervélo S5 Ultegra Di2 is designed for those who want to push to the limit in road competitions, granfondos, and high-speed races.
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.
