The Y1Rs is built around the UCI's revised 8:1 depth-to-width rule, which replaced the older 3:1 limit. That regulatory change is the main reason Colnago could finally design tube shapes deep enough to be competitive against bikes like the Cervélo S5, Cannondale SystemSix or BMC Teammachine R.
Three features stand out:
- Offset seat tube ("Defy" shape): the seat tube wraps around the rear wheel, with the seatpost set back from the tube itself. Colnago says this adds vertical compliance and effectively lengthens the top tube for aero gain.
- Bayonet fork: the front face of the head tube rotates with the fork, while the rear face stays fixed to the frame. Each frame size gets its own fork to keep trail consistent.
- CC.Y1 cockpit with WYND technology: a one-piece carbon bar-stem with a gull-wing shape and recessed bottle cages on the down tube and seat tube.
Development involved Politecnico di Milano and Khalifa University. Colnago claims its refined CFD model is roughly twice as accurate as standard industry models, calibrated against pressure readings from 70 small holes drilled into 3D-printed prototypes.
The numbers, and what they mean
Aero claims need context. Here are Colnago's published figures, taken from the manufacturer's white paper and wind tunnel data:
| Metric | Y1Rs vs V4Rs | Y1Rs vs "best aero competitor" |
|---|---|---|
| Frontal area | -19% | not disclosed |
| Drag at 50 km/h, 0° yaw | -20W | -1W |
| Stiffness (out-of-saddle sprint) | +3.5% | — |
| Frame weight | +167g (965g vs 798g) | comparable |
A 20W saving at 50 km/h is significant for sprint stages and breakaways but matters less at climbing speeds, where weight dominates. That's why the team also uses the lighter V5Rs for pure mountain stages. The competitor comparison (1W) is narrower than Colnago's own marketing tone suggests — at WorldTour level, every bike near the top is within a tight aerodynamic window.
Where Pogačar actually raced it
The Y1Rs wasn't reserved for flat stages only. Across the 2025 season, Pogačar used it in a wider range than the brand initially suggested:
- UAE Tour (February 2025): overall win, including two mountaintop stage victories on the Y1Rs.
- Critérium du Dauphiné: alternated with the V5Rs.
- 2025 Tour de France: ridden almost exclusively, including the win on Stage 4 to Rouen (his 100th professional victory), Stage 7 at Mûr-de-Bretagne, and the final stage in Paris.
- Stage 13 (Peyragudes mountain time trial): a stripped-back, ultralight Y1Rs build (~7 kg, no bottle cages, paper-thin clearcoat).
- Stage 16 (Mont Ventoux): a "Raw Carbon" version with titanium bolts and Elite Leggero cages.
- 2025 UCI World Championships, Kigali: solo victory over 267.5 km with 5,475 m of climbing, on a raw-carbon Y1Rs with Continental Archetype tyres.
- European Championships, Tre Valli Varesine, Il Lombardia: all won on variants of the Y1Rs.
That spread tells you something useful: at WorldTour level, the aero/weight trade-off favours the Y1Rs more often than expected, especially when riders can shave weight through component choices.
Geometry and ride feedback
The Y1Rs runs a steeper head tube (73–73.5° on larger sizes), a steeper effective seat angle, and a longer reach-to-stack ratio than the V4Rs. The intent is a more forward, tucked position — better for aerodynamics, and friendlier for riders who already prefer that stance.
Independent reviews from BikeRadar and Velo describe the ride as snappy and stiff, with more compliance than expected from an aero frame, partly thanks to the offset seat tube. Reviewers also note the bike feels close to an all-rounder despite the aero shape, which is unusual.
The criticisms are practical:
- Complete builds at this price don't include a power meter.
- The Vision SC45 wheels supplied on some builds are decent but underspecified relative to the frame.
- The outfront computer mount is widely flagged as poorly designed.
- The seatpost needs to be cut to size, with only ~15mm of adjustment afterwards.
Who it makes sense for
The Y1Rs is a race-oriented bike. It rewards flat-to-rolling terrain, fast group rides, and riders who hold high average speeds. If you mostly ride steep, sustained climbs, an all-rounder like the V5Rs will be a better fit — it's around 240g lighter at the frame level and matches the Y1Rs on most other ride qualities.
You can browse the Colnago range on Bikeroom to compare current builds, including the Y1Rs 2025 with Shimano Dura-Ace and the 2026 Ultegra Di2 versions in size L and XL.
FAQ
Is the Colnago Y1Rs faster than the V4Rs? At 50 km/h on flat terrain, Colnago measures a 20W saving versus the V4Rs. On steep climbs, the V4Rs and V5Rs are lighter and likely faster.
What did Pogačar win on the Y1Rs in 2025? The Tour de France overall, multiple Tour stages, the UCI World Championships road race in Rwanda, the European road race, Il Lombardia, and Tre Valli Varesine.
How much does the Y1Rs weigh? A raw frame weighs 965g, fork 450g. A team-spec complete bike with pedals and cages comes in around 7.2–7.45 kg in size M.
Is it compatible with mechanical groupsets? Yes, but cable routing is optimised for electronic shifting (Shimano Di2, SRAM AXS, Campagnolo Super Record Wireless).
What tyre clearance does it offer? Up to 32mm, which is generous for an aero race frame.
Conclusion
The Colnago Y1Rs is what Colnago looks like when it stops compromising on aerodynamics. It's not a universal best — climbers will still prefer the V5Rs, and at this price the lack of a power meter on most builds is hard to justify. But as a WorldTour aero platform, the results from Pogačar's 2025 season (Tour de France, World Championships, Lombardia) confirm what the wind tunnel data suggests: the bike is genuinely fast, with handling and compliance that don't punish you for the aero shape. For riders shopping at this level, the Y1Rs has earned its place in the conversation.
