This article was produced in collaboration with Wilier and first published in Rouleur Issue 144

Cycling is all about collaboration. The act of riding a bike is the ultimate pairing of man or woman and machine — the input of force from a human transforming a stationary tool into something that can expand horizons, both literally and figuratively. But even at the level of the bike itself, its ability to translate that power into motion is reliant on partnerships between a suite of individual components working in tandem — from the skeletal structures of the frame and forks, down to each individual chain link.

Nowhere is this collaborative process better seen than in the world of professional cycling; the translation of a rider's physical attributes into results dependent on the bike beneath them. And it's why, when updating its Filante aerodynamic racing platform, Wilier and Groupama-FDJ United worked hand-in-hand to craft a machine that would allow the WorldTour team's riders to achieve greater performance peaks compared to something created in isolation.

Pro-level input

From the start of the process, the Italian manufacturer's engineers and Groupama-FDJ United team's performance analysts formed an alliance, considering the riding and environment that the Filante SLR ID2 should be optimised for.

The input influenced everything from the fork's aeronautics-inspired NACA airfoils to the new F-Bar ID2 cockpit — an ergonomically and aerodynamically refined design that flares 3cm between the hoods and drops to foster a more tucked position when hands are high and greater control when low.

The bike's geometry was also overhauled, ensuring that rider positioning and handling would be the same regardless of size. This can be refined even further with numerous modifications available to frame size, handlebar spacers, stem length and seatpost setback, leaving 420 different possible configurations to create a practically bespoke bike fit without resorting to aftermarket components.

Sponsor-correct integration was also a factor, and is responsible for the precise placement of the Shimano Di2 battery, which was moved from the new, thinner seatpost to towards the bottom bracket to aid the bike's centre of gravity, and the accommodation of a discreet recess in the right hand chainstay behind the chainring for a Shimano power meter magnet, which is then covered by a smooth, silver cover — this small-yet-critical solution a microcosm of the Italian craftsmanship and attention to detail seen across the Filante SLR ID2.

Unlocking real-world gains

The collaboration wasn't just at a top level, and Wilier's Innovation Lab research and design department also looked at how the bike could work better as a unified system to improve its aerodynamics in real-world situations.

Computational fluid dynamics (CFD) modelling found that there were gains to be made by redesigning the Filante's down tube, bottle cages and bottles — turning something that is a necessity when riding into a watt-saving advantage. The difference was stark — with the Aerokit main triangle, complete with tapered aero bottles designed alongside hydration experts Elite and bespoke bottle cages, drag was two-thirds lower than the previous Filante.

Testing at Silverstone Sports Engineering Hub's wind tunnel proved that the alliance bore fruit too. When tested with a rider, the Filante SLR ID2's drag was reduced by 4.5 per cent compared to the previous iteration, while it had an improved average drag coefficient of 2.42 per cent compared with five top-range bikes used by other WorldTour teams. On the road, this translates to energy saved, seconds gained, and can be the difference between winning and losing.

Explosive finish

While the Filante SLR ID2's performance is a clear demonstration of the synergy between Wilier and Groupama-FDJ United, this connection is also carried through to the bike's surface.

Named Firelight Red, the team's livery for the 2026 WorldTour season, the colourway uses the red, blue and white of Groupama-FDJ United kit as a base and takes things up a notch in the way only Wilier knows how.

Working in collaboration with a specialist Italian paint-shop that has been trusted to create the artistic expressions that Wilier has become renowned for. The finish has depth and movement, symbolising a moment of ignition — whether that's the surge for the line or attack on a mountain.

(Image credit: Wilier)

And although it has no impact on the bike's hard data, it is a personification of the Filante SLR ID2 and Wilier's wider ethos — where the pairing of engineering excellence and emotion create something truly unique. wilier.com