The fastest bike we've ever tested, but is it actually any good to ride? Cérvelo S5 review

The latest iteration of the Cervélo S5 solidifies its reputation as one of the fastest aero road bikes currently available. Building on its predecessor’s strengths, the new model offers incremental improvements in weight, aerodynamics, and integration, most notably through a redesigned one-piece cockpit. With over 550km ridden across varied terrain, including flat loops and hilly climbs, the bike demonstrates exceptional speed and efficiency, making it a compelling choice for racers seeking top-tier performance. In terms of design, the S5 retains much of the distinctive shape and geometry that have characterised the model, favouring evolutionary tweaks over radical changes. The frame’s aerodynamic profile remains highly effective, with subtle refinements such as a narrower, flared cockpit and updated dropouts contributing to a claimed 6.3-watt aerodynamic gain. The bike has also shed weight, primarily through lighter seatpost and cockpit components, while the new deeper wheels and 29mm tyres are optimised to work in harmony, enhancing overall speed without compromising handling. Despite its impressive technical credentials, the S5’s ride feel has been described as calm and stable, though somewhat detached compared to more lively race bikes. This characteristic may appeal to riders prioritising efficiency and control over a more dynamic or responsive ride experience. The bike’s high-end Dura-Ace build ensures no weak points in the specification, but the premium price tag of around £12,000 may be a consideration for some prospective buyers. The review highlights that while the S5 excels in aerodynamic performance and stiffness, it may not deliver the emotional engagement or excitement some riders seek from a race bike. Nonetheless, its combination of speed, stability, and refined engineering positions it as a leading contender in the aero road bike category. For those focused on maximising race-day performance, the Cervélo S5 offers a compelling package that balances cutting-edge technology with proven design principles.