Wilier Filante SLR ID2 Review in our 2026 Aero Road Bike Comparison

Wilier enter our 2026 aero road bike comparison with an undeniably elegant race machine, the brand new Filante SLR ID2. The concept centres on tailored aero solutions, a holistic performance philosophy, and what is arguably the sleekest design in the entire test field. Is that enough to compete with some of the most uncompromising aero bikes on the market, or is it all style and no substance?

For our 2026 aero road bike comparison, Wilier have sent the latest version of their Filante SLR aero all-rounder, the ID2. It could hardly come at a better time: Wilier and Cervélo are the only brands in this group test currently ridden by UCI WorldTour teams. That pedigree really shows in the confident overhaul of their popular aero race bike.

A hunger for speed is built into the Filante SLR ID2 from the outset, anchored in a holistic concept that combines an aerodynamically optimised frame, a fully integrated cockpit and refined bottles with matching cages. Yet for all the emphasis on drag reduction, weight has not been overlooked either. On paper, it sounds like the complete aero all-rounder, but is that enough to make its mark in the 2026 aero road bike review?

Elegance in the Wind – the Philosophy behind the Wilier Filante SLR ID2

Wilier’s flair for building uncompromising race bikes became clear during our big 2025 aero road bike review, where the previous Filante SLR offered few concessions to comfort. With the new model, that is set to change. A modern race bike needs more than sharp geometry – it has to offer a smooth ride and generous tire clearance too.

That step into the modern era is obvious in the design. The black Filante SLR ID2 with its shimmering logos is arguably the most eye-catching bike in this test field and, in our view, the best-looking. Cleanly integrated details add to the appeal and promise real speed gains. The wide fork crown, for instance, has been taken straight from Wilier’s Rave SLR ID2 gravel race bike. Just like its predecessor, the ID2’s seat stays flare dramatically, a feature that has become a hallmark of today’s aero road bikes, as you’ll see on the Factor ONE and MERIDA REACTO TEAM.

But there is more. The Filante SLR ID2 has a genuine ace up its sleeve – a true unique selling point. Wilier supply specially developed aero bottles, perfectly matched to the frame, along with dedicated bottle cages. Other brands such as BMC, ROSE and Factor offer proprietary cages, but only Wilier integrate the system so consistently into the overall aerodynamic concept. Getting them in and out of the cages requires a little practise though.

The result is a cohesive package that carries through to the geometry, which aligns closely with the Wilier Verticale SLR lightweight race bike. With a stack-to-reach ratio of 1.42, the riding position is low and purposeful, ideal for launching attacks on the flat, pushing hard on climbs, or settling into the increasingly popular aero position on the hoods. Despite this, the Filante SLR ID2 feels slightly more forgiving than the other bikes in our test field. A 72.5° head angle paired with short 411 mm chainstays delivers sharp, precise handling, while the wheelbase provides reassuring composure at high speed.

Size	XS	S	M	L	XL	XXL
Top Tube	508 mm	526 mm	542 mm	559 mm	576 mm	590 mm
Seat Tube	450 mm	480 mm	510 mm	530 mm	550 mm	570 mm
Head Tube	99 mm	115 mm	132 mm	149 mm	166 mm	183 mm
Head Angle	70.6°	71.5°	72°	72.5°	73°	73.5°
Seat Angle	75.2°	74.5°	74°	73.5°	73°	73°
Chain Stay	411 mm	411 mm	411 mm	411 mm	413 mm	413 mm
Wheelbase	980.5 mm	985.1 mm	992.9 mm	1,000.4 mm	1,010.1 mm	1,018.5 mm
Reach	373.5 mm	380 mm	386.5 mm	393 mm	400 mm	408 mm
Stack	505 mm	523 mm	541 mm	559 mm	577 mm	595 mm

Black on Black – the Spec of the Wilier Filante SLR ID2

Good looks are one thing, but a race bike ultimately stands or falls on its spec. Wilier have equipped our Filante SLR ID2 with a Shimano DURA-ACE Di2 groupset, including a Shimano power meter. The drivetrain pairs a 52/36 t chainset with an 11-30 t cassette, striking a well-judged balance between top-end speed for the sprint and low range for steep climbs. Braking is handled by a 160 mm rotor up front and 140 mm at the rear.

Wilier round off the build with their in-house Miche Kleos RD 50 wheelset, shod in Vittoria Corsa Pro tires in 700×30 mm, which measure a true 31 mm on the rims. In this configuration, including the aero bottle cages, our test bike tips the scales at 7.3 kg and costs €12,700.

The Wilier Filante SLR ID2 in Review – Speed with Confidence

As an aero bike and race-focused all-rounder, the Wilier Filante SLR ID2 is designed to handle a wide range of racing scenarios. What does that actually feel like when you’re in the saddle? Out on our test loop in the foothills of the Pyrenees, the Wilier quickly proves it offers more than just good looks. The riding position is nicely centred, and the handling feels intuitive and reassuring. You feel at home straight away.

Aero down to the finest detail – even the Factor ONE’s bottles are slower!

That sense of security is reinforced by the balanced yet direct steering. The Filante thrives on speed, becoming increasingly stable as the pace rises. In tight corners it needs a slightly firmer input, but it always remains predictable. This intuitive character inspires confidence and helps you keep a cool head in hectic race situations. What you do not get, however, is the razor-sharp snap of a bike like the BMC Teammachine R.

To unlock the full potential of the Filante SLR ID2, you need to make the most of its handling traits. When you put the power down, the bike responds willingly. It may not feel quite as explosive as the lighter bikes from ROSE, BMC and MERIDA, yet it accelerates more eagerly than aero heavyweights such as the Cervélo S5 and Factor ONE.

The result is a fast, confidence-inspiring machine that also aims to impress with its efficiency. Here too it performs at a very high level, even if it cannot quite match the outright speed of the Cervélo and Factor. The aero refinements clearly work well, allowing the Wilier to gather speed quickly and with minimal fuss, and just as importantly to hold that speed with ease. In terms of efficiency, it sits on par with the bikes from BMC and MERIDA.

One standout feature is its compliance. The Filante SLR ID2 is one of the most comfortable bikes in this aero road bike review. That said, we are still talking about comfort in the context of a race bike. The Vittoria Corsa Pro tyres, measuring a true 31 mm, make long days in the saddle entirely manageable. If plush comfort is your top priority, none of the bikes in this aero road bike test are built for that brief.

All in all, Wilier have delivered a meticulously detailed and genuinely fast race bike with a thoroughly thought-through concept. It is a machine we would happily line up on the start line with, and one that more than earns its place in the WorldTour peloton.

Tuning tip: Upgrade to the new Miche Deva RD wheels for even more speed!

Who is the Wilier Filante SLR ID2 Made For?

The Wilier Filante SLR ID2 is a bike without any big surprises, and we mean that as a compliment. The concept of a deep aero frame, striking looks and clearly defined aerodynamic optimisation works exactly as you would hope. It promises speed and delivers on that promise without fuss. Its relatively low weight and composed, intuitive handling play a big part here. Whether you are a beginner pinning on a race number for the first time or a seasoned racer, you will feel at ease on the Wilier from the off – it’s a bike that builds confidence quickly. That makes it a genuine all-rounder for racing. High mountain stages, flat-out sprint days or chaotic race situations in a tightly packed bunch; the Filante SLR ID2 remains a fast and dependable companion whatever the profile throws at you.

Accessibility

1. Beginner
11. Pro

AGILITY

1. sluggish
11. playful

STABILITY

1. nervous
11. confident

HANDLING

1. demanding
11. intuitive

EFFICIENCY

1. low
11. high

ACCELERATION

1. sluggish
11. nimble

FUN FACTOR

1. dull
11. lively

COMFORT

1. firm
11. comfortable

VERSATILITY

1. low
9. high

Conclusion on the Wilier Filante SLR ID2

With the Filante SLR ID2, Wilier field a serious front-runner in the 2026 aero road bike comparison. The bike impresses with exceptionally intuitive handling, high efficiency and a competitive weight package. What keeps it from taking the overall win is a final touch of sharpness in the handling that would elevate the Filante SLR ID2 to absolute perfection. Even so, the Wilier operates at an extremely high level, and would find a very welcome home with every member of the GRAN FONDO editorial team.

Tops

• Intuitive handling
• High levels of comfort
• The best-looking paint finish in the test

Flops

• The aero bottles take a little getting used to when you pull them from the cage

More information at wilier.com.

The Testfield

This bike was tested as part of the 2026 Aero Road Bike Group Test – for an overview of this group test as well as all other tested aero bikes, check out the 2026 Aero Road Bike Group Test.

All bikes in test: Cervélo S5 | Factor ONE | MERIDA REACTO TEAM | ROSE Shave FFX | Wilier Filante SLR ID2

---

Did you enjoy this article? If so, we would be stoked if you decide to support us with a monthly contribution. By becoming a supporter of GRAN FONDO, you will help secure a sustainable future for high-quality cycling journalism. Click here to learn more.

Words & Photos: Calvin Zajac