Cervélo S5 Ultegra Di2 Bicycle

The ultimate expression of aerodynamics and speed on the road

The Cervélo S5 Ultegra Di2 is one of the highest-performing aero road bikes in the world, designed for cyclists who seek maximum speed, aerodynamic efficiency, and responsiveness in races. It has become a benchmark in international professional cycling, accompanying numerous athletes to the top of WorldTour competitions, confirming itself as one of the most successful platforms for speed specialists.

From the success of champions like Wout van Aert, who delivered extraordinary performances in major stage races, to victories achieved on the most prestigious international stages, the characteristic V-shaped handlebar and distinctive fork design have become a recognizable symbol in the world of professional cycling.

The new Cervélo S5 inherits this legacy and takes it to a higher level: it is more than 6 Watts faster than the previous generation, weighs 124 grams less, and maintains the combination of stability, precision, and responsiveness that made the model famous.

Watchword: aerodynamics

The new S5 is 6.3 Watts faster than the previous version, a figure obtained through wind tunnel tests at a speed of 30 mph.

This improvement is the result of a significant design evolution that primarily involved the front area of the bicycle, but also the aerodynamic integration of the seat tube and the rear wheel.

Cervélo has optimized every surface to reduce drag, allowing the new S5 to be at least 5 Watts faster than bicycles from its main direct competitors in aerodynamic tests.

Cervélo HB19 One-Piece Carbon Integrated Handlebar

The new HB19 One-Piece Carbon integrated handlebar represents one of the key elements of the S5's aerodynamic efficiency.

Plus-Four technology provides an upper handlebar section that is 4 cm narrower than the drops (e.g., 38 cm / 42 cm), allowing the rider to maintain a more aerodynamic position when gripping the tops and ensuring greater stability during sprints and descents when using the drops.

All available sizes comply with UCI standards, including the most recent regulations.

The bicycle also offers the possibility to replace the handlebar to achieve the ideal fit within the first 60 days of purchase, thanks to the different available configurations.

Faster and lighter

Despite the increase in aerodynamic surfaces, the new Cervélo S5 has been lightened by 124 grams compared to the previous generation.

The increased size of the fork and head tube required significant optimization of the carbon and hardware, resulting in a more efficient frame without compromising stiffness, control, and performance.

Reserve 57|64 Turbulent Aero Wheels

The new Reserve 57|64 Turbulent Aero wheels were developed jointly by Cervélo and Reserve, designed and wind tunnel tested simultaneously with the frame of the new S5.

The differentiated profile between the front and rear wheels was designed to improve airflow. The asymmetry of the rear wheel integrates perfectly with the seat tube, reducing turbulence and improving overall aerodynamic efficiency.

Compared to the previous Reserve 52|63 set, the new wheels guarantee an aerodynamic saving of 3 Watts while maintaining the same weight.

Wheel specifications:

• Front wheel: Reserve 57TA
• Rear wheel: Reserve 64TA

Custom fit and maximum comfort

The new S5's one-piece handlebar-stem system significantly improves aerodynamic performance, but Cervélo has also paid particular attention to the rider's position.

Nine different combinations of handlebar and stem are available. At the time of purchase, the authorized Cervélo dealer can help in choosing the most suitable configuration at no additional cost.

Cervélo S5 Ultegra Di2 Technical Specifications

Frame and fork

• Frame: Cervélo S5 Carbon
• Fork: Cervélo All-Carbon, Bayonet S5 Fork
• Bike Weight: 7.76 kg
• Available Sizes: 48 cm, 51 cm, 54 cm, 56 cm, 58 cm, 61 cm

Cockpit

• Integrated Handlebar: Cervélo HB19 Carbon

Handlebar width

• Size 48: 36 cm
• Size 51: 38 cm
• Size 54: 40 cm
• Size 56: 40 cm
• Size 58: 40 cm
• Size 61: 40 cm

Stem length

• Size 48: 80 mm
• Size 51: 90 mm
• Size 54: 100 mm
• Size 56: 100 mm
• Size 58: 110 mm
• Size 61: 120 mm

Seatpost and saddle

• Seatpost: Cervélo SP34 Carbon

Offset:

• Size 48: 0 mm
• Size 51: 0 mm
• Size 54: 0 mm
• Size 56: 0 mm
• Size 58: 0 mm
• Size 61: 15 mm
• Saddle: Fizik Arione R1

Shimano Ultegra Di2 Drivetrain

• Brake Levers: Shimano Ultegra R8170
• Crankset: Shimano Ultegra R8100 52/36T
• Power Meter: 4iiii Precision Pro GEN3+ Dual Sided
• Chain: Shimano M8100
• Cassette: Shimano Ultegra R8100 11-34T 12-speed
• Front Derailleur: Shimano Ultegra R8150
• Rear Derailleur: Shimano Ultegra R8150
• Brake Rotors: Shimano CL800 Centerlock

Crank arm length

• Size 48: 160 mm
• Size 51: 165 mm
• Size 54: 170 mm
• Size 56: 170 mm
• Size 58: 172.5 mm
• Size 61: 172.5 mm

Wheels and Tires

Front wheel

• Reserve 57TA
• DT Swiss 240 Dicut
• 12x100 mm
• 24H
• Centerlock
• Tubeless compatible

Rear wheel

• Reserve 64TA
• DT Swiss 240 Dicut
• 12x142 mm
• HG freehub
• 24H
• Centerlock
• Tubeless compatible

Tires

• Vittoria Corsa Pro TLR G2.0
• Size: 700x29c

Bottom bracket and headset

• Bottom Bracket: FSA, BBright thread together for 24 mm spindle
• Headset: FSA IS2
  • 1-1/8, 36° x 45°
  • 1-3/8, 36° x 45°

Thru-axles

• Front: Cervélo Aero Thru Axle Front
  • M12x1.5 mm
  • Length 122 mm
• Rear: Cervélo Aero Thru Axle Rear
  • M12x1.0 mm
  • Length 169 mm

Included Accessories

• Cervélo Rear Accessory Mount
• Cervélo Front Computer/Accessory Mount 266

Please Note

Technical specifications may change without notice based on component availability.
Product images are for illustrative purposes only and may not perfectly reflect the described features.

Why choose the Cervélo S5 Ultegra Di2

The Cervélo S5 Ultegra Di2 is a road bike designed for those who want to compete at the highest levels and get the maximum performance from every watt produced. The advanced aerodynamics, high-performance carbon frame, integrated HB19 cockpit, Reserve Turbulent Aero wheels, and Shimano Ultegra Di2 12-speed electronic groupset create an extremely fast, precise, and reliable package.

A bicycle born to win, developed for professionals and intended for the most demanding cyclists seeking uncompromising performance.

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:

1. Check out our size charts for each bike type.
2. 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.

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.

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:

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

1. Consult the manufacturer's instructions : Always check the brand's guidelines.
2. Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
3. Test the bike : If possible, test the model you intend to purchase.