Wilier Filante SLR ID2 Ultegra Di2 Bike Info

The Wilier Filante SLR ID2 Ultegra Di2 Bike is Wilier Triestina's answer to the question every serious road racer asks sooner or later: how much faster can a bicycle actually be? The Filante SLR — "filante" meaning swift and streaking in Italian — has always been the sharp end of Wilier's road lineup, and the ID2 takes that mission further. Built around a Toray carbon monocoque that blends T800, T1100, and M46JB fibers, this is a frame engineered from the fiber level up for the kind of rider who wants everything working together: aerodynamics, fit, and weight, with nothing left on the table.

The aerodynamic development behind the ID2 is measurable. Wilier worked in the wind tunnel at Silverstone to achieve a 13.6% reduction in drag over the previous generation — a figure that shows up not just on a spreadsheet, but in the sustained watts you can hold in a breakaway or the final kilometers of a race. NACA airfoil tube profiles on the fork and fully internal cable routing eliminate turbulence where it typically accumulates. The new seatpost features a slender, sharp aero cross-section that improves airflow without trading away stiffness or road compliance. Even the Di2 battery has been moved into the bottom bracket box area, so it's accessible without removing the seatpost or disturbing your saddle height — a practical refinement that matters on race day.

The ID2 platform takes the integration further with a proprietary Wilier F-Bar ID2 handlebar system and 420 possible fitting configurations — seven handlebar spacer combinations, five stem lengths, and two seatpost setback options (0mm and 15mm) give you granular control over your position. That's the difference between a bike that's fast in theory and one that's fast for you specifically. For long race days and sportives alike, the integrated Aerokit adds 1,100ml of on-bike hydration (550ml in the down tube, up to 750ml in the seat tube), keeping bottles out of the wind without adding visual bulk. With tire clearance up to 34mm, the Filante also handles the realities of real-world roads with more composure than its pure race bias might suggest.

Design Benefits

Verified wind tunnel aerodynamics: The 13.6% drag reduction over the previous Filante SLR wasn't derived from CFD simulations — it was validated at the Silverstone wind tunnel. NACA airfoil profiles on the fork, a sharp-edged seatpost, and fully internal cable routing all contribute to an aerodynamic package that's genuinely fast across a wide range of riding positions, not just a narrow optimized pose.
Three-fiber carbon construction: By combining T800, T1100, and M46JB Toray fibers in the monocoque layup, Wilier's engineers tuned each area of the frame for what it needs to do. T800 delivers stiffness where power transfer demands it, T1100 provides high-modulus structure for the tube profiles, and M46JB contributes responsiveness and vibration damping. The result is an 870g frame that's light without feeling brittle.
420 fit configurations through the ID2 platform: The Wilier F-Bar ID2 cockpit system, combined with five stem lengths, seven spacer combinations, and two seatpost setback options, gives riders genuine fit precision. This matters on a race bike more than most — a position that's even a few millimeters off costs watts and causes fatigue, and the ID2 system eliminates the compromise between aerodynamics and rider-specific geometry.
Integrated hydration without the aero penalty: The Aerokit system provides 1,100ml of on-bike storage — 550ml in the down tube and up to 750ml in the seat tube — with no external bottle cages to disrupt airflow. On longer road races or gran fondos, this is the kind of practical aerodynamics that adds up over hours.
Race-ready build from wheels to drivetrain: Miche KLEOS 50mm carbon clinchers provide genuine aerodynamic benefit on open roads without the handling unpredictability of deeper profiles in crosswinds. Vittoria Corsa Pro tires at 28mm complement the frame's up-to-34mm clearance with race-level suppleness and puncture protection. Shimano Ultegra Di2 handles shifting with electronic precision that doesn't require conscious thought.

Final Take

The Wilier Filante SLR ID2 is a road race bike that takes aerodynamics seriously without asking you to sacrifice fit or livability to get there. The ID2 platform's 420 configurations mean this bike can be dialed in for a wide range of riders, and the Ultegra Di2 drivetrain delivers race-level performance at a price that makes the complete package feel like a genuine value at $11,500. If you race, ride fast group rides, or simply want a bike that rewards the effort you put in, the Filante SLR ID2 earns its position at the top of Wilier's road lineup.

Wilier Filante SLR ID2 Ultegra Di2 Bike - Specifications

Frame Material:

Carbon Monocoque HUS MOD+ Crystal Liquid Polymer

Fork:

Carbon Monocoque HUS MOD+ Crystal Liquid Polymer

Headset:

Wilier Custom Bearings Superslim

Seatpost:

Filante SLR Carbon Custom 0mm

Front Derailleur:

Shimano Ultegra Di2 R8150

Rear Derailleur:

Shimano Ultegra Di2 R8150

Crankset:

Shimano Ultegra R8100

Chainrings:

50/34

Bottom Bracket:

Miche Integrale Pressfit 86.5

Brake Calipers:

Shimano Ultegra R8170 Hydraulic Disc

Rotors:

Shimano CL800 160mm (front), 140mm (rear)

Shifters / Levers:

Shimano Ultegra Di2 R8170

Cassette:

Shimano Ultegra R8101 12-speed 11-30

Chain:

Shimano M8100 12-speed

Wheel - Front:

Miche Kleos 50 Carbon

Wheel - Rear:

Miche Kleos 50 Carbon

Stem:

F-Bar ID2 Integrated Carbon Bar/Stem w/Garmin/Wahoo Mount

Handlebar:

F-Bar ID2 Integrated Carbon Bar/Stem w/Garmin/Wahoo Mount

Saddle:

Prologo Nago R4 PAS Tirox 137mm

Tires:

Vittoria Corsa Pro 700x28

Pedals:

Not Included

Bottle Cages:

Aero Kit - Bottles

Max Tire Width:

700x34

*Specifications are subject to change.

Wilier Filante SLR ID2 Ultegra Di2 Bike Geometry

Size:

XS

S

M

L

XL

XXL

B. Seat Tube (c-t)

450

480

510

530

550

570

C. Top Tube Length

508

526

542

559

576

590

D. Head Tube Length

99

115

132

149

166

183

E. Chain Stay Length

411

413

G. Seat Tube Angle

75.2

74.5

74

73.5

73

H. Head Tube Angle

70.6

71.5

72

72.5

73

73.5

J. Wheel Size

700c

K. Stack

505

523

541

559

577

595

L. Reach

373.5

380

386.5

393

400

408

The RA Perspective

The Filante SLR ID2 is one of those bikes that earns more respect the longer you spend with it. Wilier has been building Italian race bikes since 1906, and the Filante represents the current peak of what they know about aerodynamics — the 13.6% drag reduction over the previous generation is the kind of number that only shows up when an engineering team has been genuinely obsessive about it. At Silverstone's wind tunnel, those claims get pressure-tested, and the results carry real weight.

What we appreciate most about the ID2 is how the engineering integrates. The bike doesn't just have NACA airfoil fork profiles and internal routing as talking points — the seatpost redesign, the battery relocation, the F-Bar cockpit system, the integrated hydration — it all adds up to a coherent aero road bike rather than a collection of features. The AccuFit platform with 420 possible configurations is genuinely useful too. Too many aero bikes ask you to accept a relatively fixed position; the ID2 doesn't.

A few things worth knowing: the integrated cockpit adds complexity if you make frequent position changes or travel with the bike regularly. The PressiFit bottom bracket benefits from careful assembly to avoid the creak that can develop in carbon frames over time. And the 50mm Miche KLEOS wheels ride well on open roads but will appreciate the up-to-34mm tire clearance if you want extra compliance on rougher surfaces.

For riders targeting road races, fast fondos, or any riding where aerodynamics and position precision actually matter, the Filante SLR ID2 with Ultegra Di2 is one of the strongest complete packages at this price.

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