Cervélo S5 Review
The S5 is Cervélo’s most radical aerodynamic road bike. It’s a machine that makes no compromises on comfort or versatility, but excels in one specific area: going faster than everyone else at high speeds. Team Visma | Lease a Bike used it in about 90% of their races in 2025. Jonas Vingegaard rides it almost exclusively, even in the mountains. In the Netherlands, with its flat, open, and windy roads, the logic behind the S5 is even more evident: aerodynamics pay off, and this speed demon literally cuts through the wind.
Written by: Jos Mans | April 24, 2026 | Reading time: 5minutes
About the author: Jos Mans
Jos is a writer and cyclist, most often both at the same time. With thousands of miles under his belt and just as many words on paper, he combines his two great passions: being on the move and telling stories.
Key findings
- The S5 is available in four versions: rim brakes or disc brakes, quick-release axles or thru-axles—significant differences in terms of usage and maintenance costs
- The integrated cockpit is the most critical factor, not only for aerodynamics but also for fit and resale value
- In the refurbished market, the S5 Disc MK3 (2019–2023) and MK4 (2023–present) are the most reliable options, featuring modern components that are readily available
Overview of the Cervélo S5 Generations
| Generation | Period | Brakes | Axes | Sizes | tires clearance tires frame) | Bottom bracket | refurbished products |
|---|---|---|---|---|---|---|---|
| S5 Rim MK1 | 2011–2014 | Rim brakes | QR 9×100 / 10×130 | 48–61 | 31 mm | BBright PressFit | Very dated; a niche for lovers of classics |
| S5 Rim MK2 | 2015–2018 | Rim brakes | QR 9×100 / 10×130 | 48–61 | 31 mm | BBright PressFit | Affordable entry-level model; no hard drives |
| S5 Disc MK3 | 2019–2023 | Flat-mount disc (140 mm) | 12×100 / 12×142 thru-axle | 48–58 | 37.8 mm | BBright PressFit | Top pick: modern, readily available, good value |
| S5 Disc MK4 | 2023–present | Flat-mount disc (140 mm) | 12×100 / 12×142 thru-axle | 48–58 | 38 mm+ | BBright PressFit | High-end model; 2025 update (–124 g, –6.3 W) |
What kind of bike is the Cervélo S5?
The S5 is not a versatile bike. Cervélo explicitly positions it as a benchmark in aerodynamic efficiency, and all serious tests confirm this reputation. BikeRadar describes it as fast, stable, and surprisingly comfortable given its appearance, but also expensive and not the lightest. Cyclingnews describes it, in its 2025 edition, as a pure racing machine: phenomenally fast, but more of a tool than a bike.
During a test ride on the flat, open roads of the Groene Hart, the S5 proves to be perfectly at home. Not in the high mountains or on gravel trails, but on stretches where the wind is the enemy and every watt counts. On this terrain, it outperforms nearly all of its competitors.
It’s also a fair warning: if you’re looking for a single bike that can do it all, you’re better off choosing the R5 (a climber’s bike) or the Soloist (a versatile bike) from the Cervélo lineup. The S5 is designed for riders who know exactly what they want and are fully committed to this specialized approach.
Four generations, four stories
The first S5 was released in 2011: rim brakes, quick-release axles, and a BBright bottom bracket—robust for its time, but now outdated. The MK2 (2015–2018) remains popular as an affordable option for fans of classic aero bikes. Fast, but lacking modern features (no disc brakes, tires ).
The real revolution came with the Disc MK3 in 2019: disc brakes, thru-axles, and more advanced integration. This generation remains the gold standard and is the most sensible choice for most buyers.
The MK4 (2023–present) received an update in 2025: 6.3 watts faster, 124 grams lighter, and featuring a new fully integrated cockpit. It’s the ultimate model for those who want the best.
The cockpit as a key element
On the S5, the cockpit isn’t just a component—it’s the architectural heart of the bike. Modern versions feature a fully integrated system (handlebars, stem, cables).
Advantage: significant aerodynamic gain.
Disadvantage: increased complexity.
Disadvantage: increased complexity.
A damaged or poorly fitted cockpit is not easy to replace. When buying a used one, check it carefully:
- signs of a fall
- play or cracks
- compatibility with your position
This isn't the kind of bike where you can adjust the size with a few spacers.
The S5 on the second-hand market
Buying a refurbished bike really refurbished sense for a model like the S5. New versions cost well over €10,000, comparable to models from Specialized or Pinarello.
The refurbished market refurbished access to:
- in the same context
- with the same performance
- at a more reasonable price
But keep in mind: not all versions are created equal.A 2017 MK2 with drum brakes isn't comparable to a 2021 MK3 with disc brakes and electronic transmission.
Things to check:
- exact generation
- year
- condition of the cockpit
- Condition of the BBright housing
The BBright (press-fit) system works well when properly installed, but requires attention if it shows signs of wear.
FAQ
Which generation should I choose when buying refurbished
The S5 Disc MK3 (2019–2023) offers the best balance: it’s modern, high-performance, and readily available. The MK4 is superior, but more expensive.
Is it suitable for non-competitive cyclists?
It depends on your expectations. It’s more comfortable than it looks, but it’s designed for performance, not for leisurely rides. A Soloist is better suited for mixed use.
What is the BBright box?
A proprietary PressFit standard from Cervélo. Reliable when properly installed. When purchasing, check for smooth operation and ensure there are no noises.
How much does the Cervélo S5 weigh?
Modern high-end models weigh around 6.8 to 6.9 kg, as used by Team Visma | Lease a Bike 2025. Lightweight for an aerodynamic bike, but not the lightest in its class.