Cervélo S5 (2025) Review: Aero King Refined

The Cervélo S5 has long been a top contender in the aero road bike category, and the 2025 version solidifies its position at the front of the peloton—both literally and figuratively. With aerodynamic improvements, subtle geometry tweaks, and a focus on rider comfort and stiffness, this latest model continues to push boundaries for performance-focused cyclists.

Cervelo S5 Performance & Ride Quality

The first thing you’ll notice on the S5 is the blistering speed. This bike is built for going fast—whether you’re slicing through the wind on a solo breakaway or hammering it in a sprint finish. Cervélo has managed to make the new S5 feel more planted and confident, thanks in part to revised tube shapes and a refined fork profile.

The frame remains incredibly stiff, especially in the bottom bracket and head tube, which translates to impressive power transfer. Despite its race-oriented DNA, the S5 does a surprisingly good job of managing road buzz. It's not plush by endurance bike standards, but the compliance is welcome for an aero platform.

Cervelo S5 Aerodynamics

Aerodynamics are where the S5 truly shines. The updated model uses a new V-stem and integrated cockpit that reduce drag while offering more adjustability than previous iterations. Cervélo has also further optimized the fork crown and seatpost interface to shave watts. It’s evident this is a bike shaped in the wind tunnel but tested in real-world chaos—everything feels cohesive and dialed.

Cervelo S5 Components & Build Options

The 2025 S5 comes spec’d with Shimano Dura-Ace Di2 or SRAM Red AXS, depending on the build, and both setups are flawless in shifting and braking. The Reserve 52/63 wheels, designed in tandem with the frame, complement the bike’s aerodynamic goals perfectly. Tubeless-ready out of the box, they’re stiff, responsive, and feel fast in crosswinds.

Cervelo S5 Fit & Adjustability

One of the critiques of earlier S5 models was fit adjustability, especially with the proprietary V-stem. Cervélo has addressed this by making the new cockpit more modular and easier to dial in. Stack and reach options are more flexible, and there’s improved routing for cleaner builds and easier maintenance.

Cervelo S5 Weight

As with most aero bikes, weight isn’t the top priority, but the S5 still comes in at a respectable ~7.4kg (depending on size and build), making it light enough to crest climbs without feeling sluggish.

Cervelo S5: Who It’s For

The Cervélo S5 is not for the casual rider—it’s a purebred race machine. If you’re targeting crits, time-based PRs, or just want one of the fastest bikes money can buy, the S5 is tough to beat. However, if you’re a long-distance or endurance-focused cyclist, you may want to look at something more comfort-oriented.

Pros:
Blazing fast aero performance

Stiff and responsive

Improved comfort for an aero frame

More cockpit adjustability

WorldTour-proven pedigree

Cons:
High price point (starts around $9,000+ USD)

Proprietary parts can limit compatibility

Not ideal for relaxed or gravel riding