Wilier Triestina has always treated speed as something poetic — not just a measurement, but a feeling. With the new Filante SLR ID2, that idea gets a complete redesign. Developed alongside the Groupama–FDJ WorldTour Team, Wilier’s latest flagship aero bike isn’t just another incremental update. The Filante SLR ID2 sets a New Standard for Speed for Wilier. A complete rethink of what “aero efficiency” means when the rider is part of the equation.
At a glance, the Filante SLR ID2 doesn’t stray far from the Italian brand’s signature aesthetic. That balanced mix of sculpture and science, but underneath the surface sits a ground-up aerodynamic overhaul. The results speak clearly: a 13.6% reduction in drag over the outgoing model, verified at the Silverstone Sports Engineering Hub wind tunnel. That’s beyond the brand’s own CFD predictions and translates to 14.15 watts saved at 40 km/h, or about 1 minute and 45 seconds faster over 70 km at the same 290-watt output. In a sport where seconds matter, that’s the kind of gain you can actually feel.
Designed for the Theatre of Speed
Wilier describes the Filante SLR ID2 as “the ultimate evolution of aerodynamic racing bikes.” It’s not hyperbole. Every design choice — from tube shapes to bottle integration — was made with the rider in mind. The goal wasn’t just raw aerodynamics, but the balance of efficiency, comfort, and control across real-world conditions.
The fork, for example, uses NACA-derived airfoil profiles paired with a flat inner leg surface to stabilize airflow and reduce turbulence near the wheel and brake caliper. A subtle aero fin hides the front disc mount. This is a feature first tested on Wilier’s Supersonica SLR TT bike.
Out back, the seatstays are angled inward by 2.5°, reshaped after dynamic interaction studies between the test rider’s legs and the frame. This counterintuitive tweak helps reduce wake and keeps airflow attached to the rear triangle longer. Tyre clearance grows to 34 mm, and chainstay length increases slightly to improve stability and drivetrain alignment under 1x setups.
Integration Everywhere: The Aerokit & F-Bar ID2
The Aerokit system, developed with Elite, might be the most tangible innovation. The integrated bottle-and-cage setup doubles as an aero spoiler — smoothing airflow across one of the frame’s most turbulent zones. Compared to traditional bottles, drag is reduced by over two-thirds, yet it still accepts standard bottles (550 ml on the down tube, 750 ml on the seat tube) when you’re not chasing marginal gains.
Up front, the new F-Bar ID2 cockpit takes Wilier’s integration game to another level. Designed with Groupama–FDJ input, it introduces an Optimized Ergonomic Flare (O.E.F.) — a 3 cm orthogonal flare between the hoods and drops (available in 35/38, 37/40, and 39/42 cm widths). The design lets you tuck tighter without altering lever ergonomics, improving both comfort and aero efficiency. Even the handlebar hardware is now entirely hidden, protecting it from sweat and grime while staying UCI-legal.
Details That Define Performance
The seatpost carries over learnings from the Supersonica SLR — light, narrow, and sharp-edged for minimal drag without losing compliance. Riders can choose 0 mm or 15 mm setback, and the Di2 battery has been moved to the bottom bracket area for easier servicing, a lower center of gravity, and cleaner aesthetics.
Inside the carbon, the story gets even more precise. Wilier uses a Toray composite layup mixing T800, T1100, and M46JB fibers, creating the stiffness-to-weight balance needed for a frame that feels as quick as it looks. The result: 860 g (unpainted, medium) and a complete Dura-Ace Di2 build at 7.1 kg — fast, compliant, and ready for modern racing speeds.
Geometrically, Wilier leaned on Groupama–FDJ’s pro feedback, refining fit across six frame sizes, seven spacer stacks, five stem lengths, and two seatposts. Thanks to the AccuFit system, that translates to 420 potential fit configurations, each only 2 mm apart — effectively making every Filante feel tailored.
Paint as Performance
As ever, Wilier’s paintwork turns speed into sculpture. The Filante SLR ID2 debuts in four colors — Pure White, Solar Bronze, Aurora Blue (Premium Paint), and Lunar Grey — with Eclipse Black joining the lineup as a deep, glassy option. Each is designed to amplify light and motion, revealing the bike’s carbon structure and contours under changing conditions.
Geometery
Pricing & Builds
Frame weight remains unchanged from the ID1, but bottom bracket stiffness climbs 7.5%. Complete builds start at €9,900 (SRAM Force AXS, Miche Kleos 50 mm wheels) and top out at €13,100 (Campagnolo Super Record Wireless, Kleos RD 50 mm). The frameset-only option — including the F-Bar ID2 cockpit, Aerokit, and computer mount — lists at €5,800.
If the numbers hold, Wilier’s Filante SLR ID2 could stand toe-to-toe with the most advanced aero road bikes in the world. More than just a wind-tunnel trophy, it’s a deliberate fusion of Italian design, pro-team validation, and measurable race-day advantage — a machine built for the theatre of speed, where every watt, every second, and every line through the air counts.
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