The Wilier Filante SLR ID2
Where Air Ignites
Wilier Triestina: Beauty with Purpose
Wilier Triestina has been building bikes in northeastern Italy since 1906 — over a century of racing heritage shaped by the roads of the Veneto. But Wilier has never been content to build bikes that just perform. They build bikes that stop you before the spec sheet does.
The Filante SLR ID2 is the purest expression of that philosophy. Developed alongside the Groupama–FDJ United Cycling team at the Silverstone wind tunnel, it is 13.6% more aerodynamic than its predecessor — and it looks like nothing else in the peloton. Speed and beauty, refined into one frame.
The Italian Difference
There is a reason Italian bikes feel different. It is not marketing — it is a design philosophy that refuses to separate how a bike rides from how it looks. Wilier has been doing this longer than most, and the Filante SLR ID2 is their most complete statement yet: a frame that is faster in the wind tunnel, lighter on the scale, and more striking in person than anything they have built before.
When you choose a Wilier, you are buying into that mindset — a bike shaped by racing, but made for riders who believe the ride should feel as good as it looks.
The Filante SLR ID2: 13.6% Faster Through the Air
The numbers tell the story. In Silverstone wind tunnel testing, the Filante SLR ID2 posted a 13.6% reduction in aerodynamic drag over the outgoing Filante SLR — exceeding even Wilier's own CFD predictions. With a rider aboard, the system-level improvement is 4.5%, which in real-world terms means free speed on flat roads, in crosswinds, and at race pace.
But the Filante SLR ID2 is not just faster. At approximately 870 grams for a painted size M frame, it is lighter too. And with geometry developed alongside Groupama–FDJ riders, it handles with the precision and stability you need when the road gets fast.
Form Meets Function — Italian Style
The Filante SLR ID2 carries that unmistakable Italian presence — clean lines, purposeful shapes, and a finish that catches light differently from every angle. But nothing here is just for style. Every tube profile, every junction, every surface is shaped to move air more efficiently. It is one of the rare bikes that looks like art and rides like a weapon.
Toray Carbon: T800 + T1100 + M46JB
Three grades of Toray carbon fiber — T800, T1100, and M46JB — give Wilier's engineers precise control over where the frame is stiff and where it gives. T1100 handles the high-stress areas that demand rigidity under sprinting and braking loads. M46JB provides the ultra-high modulus needed for stiffness without weight. T800 fills in the structural matrix, balancing durability and compliance.
The result is a frame that responds instantly when you stand on the pedals, holds its line through fast descents, and does not punish you on rough roads. At 870 grams, there is nothing extra — every gram is structural, and every gram is purposeful.
Engineering Every Advantage
The F-Bar ID2 is an aero cockpit developed with Groupama–FDJ riders. Its Optimized Ergonomic Flare positions your arms 30mm closer together at the hoods than at the drops — better aerodynamics without sacrificing control. For the first time on a Wilier, the clamping hardware is fully hidden.
The fork combines external NACA airfoils with a flat internal profile, tested with CFD simulations to optimize airflow around the wheel and tire. An aerodynamic fin on the left leg guides air around the disc brake. The fork crown is more pronounced than the previous SLR for superior torsional stiffness.
Developed with Elite, the Aerokit features recessed bottle cages that fit into a depression in the down tube — functioning as a spoiler that stabilizes airflow around the frame. Total capacity: 1,100ml across both bottles, with traditional round-bottle compatibility on the seat tube.
The down tube was developed with a precise goal: minimum aerodynamic drag while reducing the exposure of water bottles to the airstream. The resulting profile is wider and flatter than conventional designs — shielding the bottles and channeling air cleanly along the frame.
The Filante SLR ID2 is conceived like a tailored suit: 6 frame sizes, 7 handlebar spacer combinations, 5 stem sizes, and 2 seatpost versions create 420 possible configurations — each differing by just 2 millimeters. Precision fit, not approximation.
F-Bar ID2: The Cockpit Reimagined
Wilier designed the F-Bar ID2 from scratch alongside Groupama–FDJ athletes — not as a retrofit, but as a purpose-built aero cockpit for the Filante platform. The key innovation is the Optimized Ergonomic Flare: a 3cm orthogonal flare between the high and low grip positions that narrows your frontal profile at the hoods without changing how the bars feel in your hands.
All clamping hardware is hidden — a first for Wilier — which improves aesthetics, protects against dirt and sweat, and removes drag-creating surface disruptions. The result is the cleanest cockpit Wilier has ever produced, fully UCI-compliant and ready for the WorldTour.
NACA Airfoil Fork: Precision in the Wind
The fork is where Wilier got technical. External NACA airfoils — the same profiles used in aerospace engineering — channel air efficiently around the fork legs and into the wheel cavity. The internal profile is deliberately flat, optimized through CFD simulation for the way air actually behaves around a rotating wheel and tire.
A thin aerodynamic fin on the left leg manages airflow around the disc brake — one of the highest-drag areas on any road bike. The fork crown is more pronounced than on the previous SLR, providing superior torsional stiffness and stress resistance under hard braking and cornering.
Aerokit: Where Aerodynamics Meets Hydration
Most aero bikes treat water bottles as an afterthought — something that disrupts an otherwise clean profile. Wilier and Elite designed the Aerokit system to make the bottles part of the solution. Recessed cages fit into a sculpted depression in the down tube, and the bottles themselves act as a spoiler — stabilizing turbulent air and actually improving aerodynamic performance with bottles mounted.
Total capacity is 1,100ml across both positions, and the seat tube remains compatible with traditional round bottles up to 750ml. Function and performance, not compromise.
Designed and Tested in Italy
Every Filante SLR ID2 frame carries a small inscription on the rear chainstay: the GPS coordinates of Wilier's headquarters in Rossano Veneto, followed by "Designed and Tested in Italy." It is a quiet detail on a bike that could afford to be louder — and it says everything about where this machine comes from.
The rear triangle itself features widely flared seatstays and a distinctive dropout design optimized for both aerodynamic flow and structural rigidity. Cleaner routing, less drag, and a stiffer connection to the rear wheel.
Hidden Bar Clamping
For the first time on a Wilier, the handlebar clamping hardware is fully concealed within the stem — improving aesthetics, protecting the mechanism from dirt and sweat, and eliminating surface disruptions that create drag. A small detail with measurable impact.
Premium Paint Finishes
The Firelight Red finish is just one of a few colors that make a true statement. A deep, luminous red with visible carbon texture beneath the clear coat, accented by a brilliant blue top tube stripe in the Groupama–FDJ team livery. Wilier's Premium Paint process delivers a depth and richness that flat color simply cannot match.
Find Your Size
The Filante SLR ID2 comes in six sizes — XS through XXL — with geometry tuned for aerodynamic racing. A stack-to-reach ratio of 1.42 delivers a low, purposeful riding position ideal for attacking on the flat or settling into the aero position on the hoods. Short 411mm chainstays keep handling sharp and responsive.
With 420 fitting configurations across frame size, spacer stack, stem length, and seatpost offset, the Filante SLR ID2 can be dialed to within 2mm of your ideal position. If you want help, our team can guide you using your height, inseam, current bike fit, and riding goals.
| Size | XS | S | M | L | XL | XXL |
|---|---|---|---|---|---|---|
| Seat Tube c-t (mm) | 450 | 480 | 510 | 530 | 550 | 570 |
| Top Tube (mm) | 508 | 526 | 542 | 559 | 576 | 590 |
| Head Tube (mm) | 99 | 115 | 132 | 149 | 166 | 183 |
| Chainstay (mm) | 411 | 411 | 411 | 411 | 413 | 413 |
| Seat Angle (°) | 75.2 | 74.5 | 74.0 | 73.5 | 73.0 | 73.0 |
| Head Angle (°) | 70.6 | 71.5 | 72.0 | 72.5 | 73.0 | 73.5 |
| Wheel Size | 700c | 700c | 700c | 700c | 700c | 700c |
| Stack (mm) | 505 | 523 | 541 | 559 | 577 | 595 |
| Reach (mm) | 373.5 | 380 | 386.5 | 393 | 400 | 408 |
