wilier rennrad 2021 Wilier Filante SL Ultegra Di2 Bike

The Wilier Filante SL Ultegra Di2 Bike exists because of a simple idea: the aerodynamic performance developed for WorldTour racing shouldn't require a WorldTour budget. Wilier built the Filante SLR to win races at the highest level of professional cycling — and the Filante SL takes that same frame architecture, the same geometry, the same racing posture, and recalibrates the carbon lamination for riders who want genuine aero speed without the SLR's uncompromising stiffness. The result is a race bike that's faster than it has any right to be at this price, with just under 150 grams of additional frame weight separating it from the bike that professionals race in the world's biggest events.

That weight difference isn't a downgrade — it's a deliberate engineering choice. The NHU MOD+ High Impact Strength carbon used in the Filante SL's monocoque frame and fork produces a structure that's measurably more compliant than the SLR's, absorbing road chatter on long efforts without sacrificing the aerodynamic profile that defines the Filante line. The frame weighs 1,010 grams for a painted size M. And because Wilier designed the SL to share the SLR's metal components — the seatpost, spacers, top cover, dropout — the fit and feel between the two bikes is remarkably close. You're getting the same cockpit geometry, the same thru-axle Speed Release design, and the same silhouette that Wilier's WorldTour riders use in the peloton.

The cockpit tells that story clearly. The Z-Bar Integrated Carbon handlebar and stem are a single unit with fully internal cable routing — no external housing, no visible brake lines, nothing interrupting the clean lines that make the Filante family identifiable from a distance. Cables pass through Wilier's proprietary superthin headset bearing, an engineered detail the company developed in-house and doesn't sell on the open market. It's the kind of specification you expect on bikes that cost considerably more. Paired with Shimano Ultegra Di2 electronic shifting — one of the most reliable and precise drivetrains in cycling — the Filante SL is a complete aero road bike ready for race day or a hard training block the moment it arrives.

Design Benefits

1. WorldTour aero architecture, retuned for real riders. The Filante SL shares its geometry, silhouette, and aerodynamic profile with the SLR — Wilier's top-end race bike. The change in carbon lamination adds just under 150g to the frame while producing a more compliant ride character suited to training days, gran fondos, and amateur racing.
2. Fully integrated cockpit with proprietary bearing technology. The Z-Bar one-piece carbon cockpit routes all cables internally through Wilier's superthin headset bearing — an in-house design not available on the open market. The result is a clean front end with no aerodynamic disruption and no external cable management to deal with.
3. Shimano Ultegra Di2 12-speed electronic shifting. The R8150/R8170 groupset delivers the kind of crisp, consistent shifting that used to be reserved for Dura-Ace builds. Hydraulic disc brakes with 160/140mm rotors provide strong, modulated stopping power in any conditions.
4. Miche SWR EVO 50 wheelset. The 50mm deep-section carbon wheels strike a useful balance between aerodynamic efficiency and crosswind manageability — fast enough to matter in a group ride or race, stable enough for everyday training.
5. Electronic and disc-only configuration. Wilier designed the Filante SL exclusively for electronic shifting and disc brakes. That's not a limitation — it's a commitment to a build that performs consistently and pairs correctly with the integrated cockpit and frame design.

Final Take

The Wilier Filante SL is an aero road bike for riders who want race geometry and genuine aerodynamic performance without stepping into the SLR's price bracket. It's built in Italy, equipped with one of the best electronic drivetrains on the market, and rolls on 50mm carbon wheels. For anyone looking for a capable, fast race bike that doesn't ask you to compromise on the things that matter most — frame quality, shifting precision, and aerodynamic intent — the Filante SL Ultegra Di2 is a serious machine at a considered price.