Cervelo S5 Ultegra Di2 Bike

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Cervelo | SKU: 0L0S5GUI2C48 | Option: Carnelian, 48cm

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Cervelo S5 Ultegra Di2 Bike Info

The Cervelo S5 Ultegra Di2 Bike answers one question with the entire machine: how much speed can a road bike deliver before you even start pedaling harder? Cervelo has been building dedicated aero road bikes for two decades, and the current S5 represents the most resolved iteration of that work. Every element — frame, fork, cockpit, seat tube, and wheels — was co-developed as an integrated system rather than assembled from independent parts. The goal was to reduce aerodynamic drag at every contact point, and the design reflects that intent in every detail.

The carbon frame features an asymmetric seat tube shaped to match the profile of the rear wheel, eliminating the turbulence-generating gap that a round seat tube creates next to a deep-section wheel. Up front, the fork legs and head tube are deeper than the previous generation, and the one-piece integrated carbon bar and stem — Cervelo's Plus-Four concept — narrows 4cm at the hoods relative to the drops. That geometry reduces the frontal area your upper body presents at speed, where aerodynamic drag is the decisive variable. Cervelo's own testing places the current S5 at 6.3 watts faster than its predecessor. Despite an increase in surface area to achieve those gains, the frame is 124 grams lighter than the previous generation — a product of refined carbon architecture, not a tradeoff with stiffness or strength.

The Ultegra Di2 build pairs Shimano's 12-speed electronic groupset with a 52/36T crankset and 11-34T cassette, running on a ceramic bottom bracket. Ultegra Di2 delivers consistent, instant shifting under any load — the same actuation logic and electronic precision as Dura-Ace Di2, with the long-term reliability that holds its adjustment over thousands of kilometers of hard riding. A power meter comes standard in this build, integrated into the crankset, removing a purchase you'd otherwise budget separately. The Reserve 57|64TA carbon wheelset with DT Swiss 240 hubs completes the package: a deep front-and-rear combination engineered for aerodynamic performance, with Swiss hub precision and engagement quality built for the long haul. The S5 is available in Five Black and Carnelian across six sizes from 48 to 61cm, and every size combination is fully UCI-legal for competition.

Specs at a Glance

Frame: Carbon aero, asymmetric seat tube
Fork: Carbon aero, integrated with frame system
Cockpit: One-piece integrated carbon bar/stem (Plus-Four concept)
Drivetrain: Shimano Ultegra Di2, 12-speed electronic
Crankset: 52/36T with integrated power meter
Cassette: 11-34T
Bottom Bracket: Ceramic
Wheels: Reserve 57|64TA carbon
Hubs: DT Swiss 240
Seatpost: Carbon
Sizes: 48, 51, 54, 56, 58, 61cm
Colors: Five Black, Carnelian
UCI Legal: Yes

Design Benefits

Integrated aero system — frame, fork, cockpit, and wheels co-designed for aerodynamic performance rather than optimized as separate components
Plus-Four cockpit — one-piece carbon bar/stem narrows 4cm at the hoods vs. the drops, reducing frontal area at speed without compromising descending grip position
Asymmetric seat tube — shaped to match the rear wheel profile, eliminating the turbulence-generating gap that a conventional round seat tube creates alongside a deep-section wheel
Power meter standard — integrated into the crankset, removing a typical separate cost from the build equation
Reserve 57|64TA with DT Swiss 240 hubs — performance wheelset spec that pairs deep-section aerodynamics with Swiss hub precision and longevity

Final Take

The S5 Ultegra Di2 is the entry point into Cervelo's flagship aero road bike platform — and it arrives more complete than most bikes at this level. You're getting the same frame and fork architecture as the top-tier S5 builds, the same integrated cockpit, the same Reserve wheels, with Shimano Ultegra Di2 handling the shifting. Power meter included. Ceramic bottom bracket. Nothing left to upgrade before the first race. For a rider who's serious about free speed, who wants a properly integrated aero machine rather than an aero frame with budget parts bolted on, the S5 Ultegra Di2 makes a compelling case for where it sits.

Cervelo S5 Ultegra Di2 Bike - Specifications

Frame Material:

Carbon

Fork:

Cervelo All-Carbon Bayonet S5 Fork

Headset:

FSA SL IS2 1-1/8, 36 x 45 / 1-3/8, 36 x 45

Seatpost:

Cervelo SP34 Carbon

Front Derailleur:

Shimano Ultegra Di2 R8150

Rear Derailleur:

Shimano Ultegra Di2 R8150

Crankset:

Shimano Ultegra R8100 w/4iiii Precision Pro GEN3+ Dual Sided Power Meter

Chainrings:

52/36

Bottom Bracket:

FSA BBright thread together for 24mm spindle

Brake Calipers:

Shimano Ultegra R8170 Hydraulic Disc

Rotors:

Shimano CL800 Centerlock

Shifters / Levers:

Shimano Ultegra Di2 R8170

Cassette:

Shimano Ultegra R8100 12-speed 11-34

Chain:

Shimano M8100 12-speed

Wheel - Front:

Reserve 57TA / DT Swiss 240 / Tubeless Compatible / 12x100mm

Wheel - Rear:

Reserve 64TA / DT Swiss 240 / Tubeless Compatible / 12x142mm

Stem:

Cervelo HB19 Carbon

Handlebar:

Cervelo HB19 Carbon

Saddle:

Selle Italia NOVUS BOOST EVO SuperFlow Ti

Tires:

Vittoria Corsa Pro TLR G2.0 700x29

Pedals:

Not Included

*Specifications are subject to change.

Cervelo S5 Ultegra Di2 Bike Geometry

Size:

C. Top Tube Length

520

535

550

565

581

595

D. Head Tube Length

104

125

152

173

E. Chain Stay Length

405

F. BB Drop

74.5

69.5

G. Seat Tube Angle

H. Head Tube Angle

73.5

I. Stand Over Height

712

734

758

781

804

822

J. Wheel Size

700c

K. Stack

496

519

542

565

588

608

L. Reach

367

376

384

392

401

409

Stem Length

80mm

90mm

100mm

110mm

120mm

Bar Width

36cm

38cm

40cm

M. Crank Length

165mm

170mm

172.5mm

The RA Perspective

The S5 is one of those bikes where the design intent is immediately legible. Cervelo built the current generation around aerodynamics as a total system — frame, fork, cockpit, and wheels all co-developed rather than assembled from independent parts — and when you spend time with the bike, you can see how each decision reinforces the others. The asymmetric seat tube, the Plus-Four integrated cockpit, the Reserve wheels: none of it is incidental.

The Ultegra Di2 build specifically makes a strong case. The Reserve 57|64TA wheelset is the same rolling stock you get on builds that cost significantly more — these wheels would represent a meaningful separate investment on their own. Add the standard power meter and the ceramic bottom bracket, and the bike arrives more complete than most at this level. Ultegra Di2 itself is not a compromise groupset in any real sense: the shifting is precise, the adjustment holds over time, and the 52/36 with an 11-34 cassette gives you a versatile spread across race courses and training days alike.

One thing worth flagging before ordering: the integrated one-piece cockpit is a commitment. It's the right call aerodynamically and keeps the front end clean, but if you're between sizes or have specific fit requirements, a professional fitting beforehand is worth the time. The cockpit is built into the S5 system, so it's not a quick swap once you're set up.

Who reaches for this bike: riders who are done spec-hunting and want a complete, race-ready aero road bike — power meter included, serious wheels on, nothing to apologize for out of the box.

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