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Road Framesets

Cervelo S-Series Disc Frameset 2021

Looking to build up a competitive aero road bike to dominate your friends and frenemies? With it's most recent S-Series frameset release (a carryover from the 2019 S3), Cervelo has made significant improvements over the previous generation S3 frameset with specifications that deliver a stiffer, faster, smoother, and more aerodynamic experience across the full S-Series range. This frameset allows you to build a complete Cervelo bicycle that is perfectly positioned as the best combination of value, accessible pro race level performance and applied groupset technology available today.

As popular and respected as the R-series bikes are both within and outside Cervelo, the S-series truly represents the core engineering and aerodynamic values of the Canadian company. The current TrueAero tube and overall frame design represent the evolution of NACA-derived aero shapes and the application of flatback, or what is also known as a Kamm tail design. Perhaps the best way to think of this is consider the NACA shapes as variations of elliptical or oval airfoils, as commonly seen on airplanes. The Kamm tail is essentially a foil with a squared-off back side. This is much more effective at speeds that bicycles attain, with the overall oval widening slightly as from the front to back. This increases the time the frontal or angled onrushing air stays cleanly on the tube and releases cleanly off the back, while providing a push, from what is known as laminar boundary layer.

The aerodynamic advantages of this are clear, but the focus of the engineering is on how to bring each tube shape and junction together to create a complete aero package. Yet that is only a portion of the S-Series, or any other frameset story. The assembly needs to be a performance bike that offers torsional headtube and bottom bracket stiffness- which is augmented by the flatback design, along with proper geometry, an appropriate level of vertical compliance. Overall safety is, of course, paramount. So the sleek lines and optimal integration you see from the outside houses a lay-up of various carbon fiber types that deliver safety, strength, power transfer, control and a connection to the road that inspires. Of course some of the engineering can be seen as well, with the Asymmetric BBright system and chainstays the most obvious. The aero fork, frame interface is both visually impressive and aerodynamically sound, while the partial seattube cutout carries the air that clings to the frame and guides it as cleanly as possible beyond the rear wheel.

The disc brake design of the full carbon proprietary fork and frame has allowed the the designers to improve tire clearance (up to 30mm) and overall dropout stiffness, while improving the aero principles of the fork and rear stays that no longer have a brake to carry. The disc caliper mount is the Flat Mount standard, and the maximum rotor size is 160mm. Cable/housing routing for the fork and frame is internal, with the S-Series employing the Aero Cable Management system. For the S-Series a unique aspect of this is the included AB09 aero handlebar and the ST29 Stem combination. These are not standard retail equipment, but specific options designed to work together to bring the housing and wires underneath the bar to pass into the stem and down the headtube to the frame. Yes, this requires a new headset bearing tension system and some deft and knowledgeable handling when building or adjusting, but when wired or cabled, with hydraulic hose set-up, this is actually a practical design, and once assembled once becomes much easier to manage. The end result is a super clean bar and stem set-up that features your levers and tape. It is impressive, and improves aero efficiency.

From a geometry perspective, the S-Series Disc Frameset is race ready, though with a slightly taller headtube than a World Tour design. You can still get plenty low. Cervelo supplies the bar and stem in sizes that are general matches to the size. Please contact us if you require other sizes to meet your bike fit. Cervelo recommends you opt for an tech or shop with up to date Cervelo experience for a complete build. Here at Excel Sports we can work with you to create a build featuring Shimano, SRAM, or Campagnolo groupsets. Just reach out to us at 800.627.6664 during business hours or email sales@excelsports.com to get the conversation rolling. We do our best to stock all electronic and mechanical options, along with aero wheelsets from Zipp, Shimano, HED, Reynolds, ENVE and Black Inc, and plethora of awesome saddles.

Cervelo provides a frame-specific FSA IS-2 headset for the proprietary full carbon S-Series Disc Fork with the tapered 1¼" to 1⅜" steerer tube. You also get the SP20 Aero Carbon Seatpost, AB09 Carbon handlebar, and ST29 fork-specific stem.


  • Re-engineered S-Series Disc frameset improved aero efficiency
  • Very clean design with aero integrated internal routing system from bar/stem back
  • TrueAero tubeset features advanced flatback design, new fork system
  • Aero Cable Management system with bar-stem hidden routing into headtube
  • Tech: Partial Seattube Cutout, integrated fork-downtube system, BBright 79mm Asymmetric bottom bracket shell, rear stay, aero seatpost
  • Carbon S-Series Disc fork with integrated routing, 12/100mm thru-axle, Flat Mount
  • Includes FSA IS-2 1-1/4 x 1-3/8 headset specific to the frame/fork design
  • Frame features rear 12/142mm thru-axle, improved lay-up for better vertical compliance
  • Stocked in: 48, 51, 54, 56, 58 cm sizes (48, 51 come with Zero offset post)
  • Component sizes included by frame size
    • 48cm Bar width: 38c-c, Stem length: 90mm, Post offset Zero
    • 51cm Bar width: 40c-c, Stem length: 90mm, Post offset Zero
    • 54/56cm Bar width: 42c-c, Stem length: 100mm, Post offset 25mm
    • 58/61cm Bar width: 44-c-c, Stem length: 110mm, Post offset 25mm
  • Sizes: 48, 51, 54, 56, 58, 61
  • Colors: Silver/Carbon, Purple Chameleon, Grey/Silver/Grey