Orbea's New Orca Aero Is the Most Interesting Aero Bike at the Tour — Here's Why
The Basque brand's fourth-generation Orca Aero claims 21 watts of system-level gains, boasts the lowest bottom bracket drop in the pro peloton, and has 37 mm of tyre clearance on an aero race bike.
If you've been watching the Tour de France this July, you've probably spotted the Lotto-Intermarché squad aboard a sleek black machine with a distinctly low silhouette and a wider-than-expected fork opening. That is the new Orbea Orca Aero — fourth generation, launched right on the eve of the race, and carrying some of the boldest aerodynamic claims of any bike to hit the pro peloton in recent memory.
Orbea claims a 21-watt system advantage over the 2022 model. That's a big number, and the brand's own product manager is refreshingly upfront about what it actually means — and what it doesn't.
The Headline Numbers, Unpacked
Orbea breaks the claimed 21-watt figure into two distinct buckets. The first: a 5.1 W drag reduction for the frame and fork alone at 50 km/h — a number that's consistent across all wind yaw angles and one that passes the sniff test given that Cervélo claimed around 6 W for their entire S5 redesign in 2025. The second bucket, worth roughly 14-16 W, comes from what Orbea calls its "total system approach" — meaning the gains are in how the bike positions the rider, not just how the frame slides through the air on its own in a wind tunnel.
The key mechanism is the 78 mm bottom bracket drop. That is the lowest BB drop in the pro peloton across all frame sizes — 4 mm lower than the previous model. Dropping the BB lowers the rider's centre of gravity, increases stability and control in corners, reduces the rider's frontal area, and narrows the effective CdA (coefficient of drag area). Orbea found that lowering the BB was, as their road product category manager put it, "the main improvement that we've done on the bike" after all the CFD calculations and wind-tunnel work were complete.
On top of that, the Di2 battery has been relocated to the bottom bracket shell, allowing the seat tube and seatpost to become meaningfully narrower — shaving drag where the air first contacts the rear of the frame.
37 mm Clearance on an Aero Bike — Really
This is the detail that made every tech journalist at the Tour do a double-take. Tyre clearance on the new Orca Aero is 37 mm — up 7 mm from the outgoing model and the widest in the pro peloton. With the fork's additional 5 mm of breathing room, you can realistically run 40 mm rubber if you're not in a UCI road event.
Orbea says the bike maintains full aerodynamic performance with tyre widths from 29-35 mm, and claims 6-7 W of rolling resistance savings at 40 km/h on cobbles or rough asphalt compared to a narrower setup. The practical implication: riders don't need to choose between flat-stage speed and comfort on rough roads. Baptiste Veistroffer (Lotto-Intermarché) has already been using the extra tyre clearance to his advantage on the Tour's flatter parcours.
Weight: Finally Competitive
The outgoing 2022 Orca Aero had a weight problem. Depending on build, it hovered around 7.5-8 kg — heavy by modern aero bike standards. The new version changes that. A size 53 with Dura-Ace Di2 tips the scales at 7.04 kg (or 6.9 kg specced with SRAM Red AXS). The frame itself weighs approximately 900 g and posts a stiffness of 93 Nm/° — up from 90 Nm/° on the previous 1,150 g frame. That's meaningfully stiffer and 250 g lighter simultaneously, thanks to an improved OMX carbon layup.
Orbea also claims a 2 W saving at 17 km/h on an 8% climb compared to the previous generation, purely from that stiffness-to-weight improvement. That makes the Orca Aero competitive on mountain stages where last year's model was often swapped for the lighter Orca climbing bike.
The Cockpit System: 13 Sizes, Obsessive Fit
The integrated OC RA10 one-piece bar/stem combination comes in 13 standard sizes — widths of 360, 380, and 400 mm paired with stems from 80 to 140 mm in 10 mm increments. There are 40 mm of stackable spacers for vertical adjustability. WorldTour riders at Lotto-Intermarché get access to an additional 13 extended-reach configurations.
A "Spin Block" — a physical stop built into the fork — prevents the handlebar from rotating more than 90 degrees, protecting the downtube in a crash or when leaning the bike in the garage. It is the kind of small-details engineering that makes this feel like a genuinely considered WorldTour machine.
Pricing and Availability
The range spans six builds across seven frame sizes (47-60 cm). The flagship Orca Aero M10i LTD with Dura-Ace Di2 and Oquo Road Aero RA57LTD wheels is priced at £9,999 / €10,999 / $12,127. The most accessible entry point is €5,699 — and crucially, Orbea uses the same premium OMX carbon construction across the entire range.
What This Means for Your Riding
The Orca Aero's most practically transferable lesson is the 37 mm tyre story. Wider rubber isn't just about comfort — Orbea's own data shows measurable watt savings on imperfect surfaces. If you're still rolling 25 mm on your aero bike because "that's what race bikes take," it may be time to reconsider. Running 30-32 mm on a modern aero frame with the clearance to handle it could be one of the best free-speed upgrades you make this summer — no new bike required.