Wilier
Filante SLRShimano Ultegra Di2 R8170 (Miche SWR Evo 50)
The Wilier Filante SLR ID2 is a dedicated aero race bike built for the WorldTour and refined for high-speed stability. For this second generation, Wilier focused heavily on aerodynamic integration, most notably through a proprietary Aerokit hydration system co-developed with Elite. By treating the bottles and cages as structural aerodynamic elements rather than accessories, the frame smooths airflow across the down tube and bottom bracket. Beyond the hydration system, the ID2 introduces a reworked fork with an enclosed dropout, increased tire clearance up to 34mm, and a new integrated cockpit. Positioned as Wilier’s premier flat-to-rolling race machine, it suits competitive riders who prioritize sustained speed and composure over hyper-reactive handling. It represents a mature approach to the aero category, delivering pro-level stiffness and efficiency in a package that remains manageable during long, demanding days in the saddle.
Spec sheet.
Every component shipped with this build.
Geometry & fit.
6 sizes published.
The Filante SLR ID2 utilizes an aggressive, race-oriented geometry designed to keep the rider in a low, aerodynamic posture. With a stack-to-reach ratio of approximately 1.42 on a size large, the fit is decidedly forward, favoring riders with the flexibility to sustain a tucked position. To balance this aggressive rider placement, Wilier slightly lengthened the rear triangle and overall wheelbase compared to the previous generation. This near one-meter wheelbase on larger sizes, paired with a 72.5-degree head tube angle, yields a calm, predictable steering response that resists twitchiness at high speeds.
Fit is heavily dictated by the new F-Bar ID2 integrated carbon cockpit. The bar features a distinct 3-centimeter flare, meaning a setup that measures 37cm at the hoods widens to 40cm in the drops. This design narrows the rider's frontal profile when cruising on the hoods while providing a wider, more stable stance for sprinting and descending. Because the cockpit is a proprietary one-piece system offered in a limited number of size configurations, buyers have restricted options for fine-tuning stem length and bar width after purchase.
Where the handlebar sits relative to the bottom bracket — the single most important fit pair.
01Fit geometry5 values
02Component geometry1 values
03Handling geometry4 values
Which size should I buy?
Slide your height to see the recommended size. GearWise's fit algorithm works from the published stack, reach, and ETT — the brand's own recommendation may differ.
→Calculated from GearWise's own stack / reach / ETT algorithm — the brand's size chart may recommend a different size, and a proper bike fit beats any calculator.
The lineup.
6 builds, ranging $10,500 – $15,500.
The Filante SLR ID2 is positioned exclusively as a premium superbike, with a build ladder that reflects its WorldTour pedigree. The range starts with Shimano Ultegra Di2 and SRAM Force AXS options, both paired with Miche Kleos 50 carbon wheels. From there, the lineup ascends to flagship electronic groupsets, including Shimano Dura-Ace Di2, SRAM Red AXS, and Campagnolo Super Record WRL. The SRAM Red AXS build notably includes an integrated power meter as standard.
A defining characteristic of the build range is Wilier’s deep integration with its sister company, Miche. Across the lineup, Miche supplies not only the carbon wheelsets but also CNC-machined Italian hardware like thru-axles, bottom brackets, and center-lock rotor rings. The top-tier builds upgrade to Miche Kleos RD 50 wheels equipped with CeramicSpeed bearings.
Value is a complex proposition for the Filante SLR ID2. It carries a significant price premium over comparable flagship aero bikes from mainstream brands, placing it firmly in the luxury tier alongside other heritage Italian marques. Buyers are paying for the sophisticated carbon layup, the proprietary aerodynamic hydration system, and the cohesive, highly integrated European component package rather than strictly maximizing watts per dollar.
From the press.
6 reviews from the cycling press.
Reviewers consistently characterize the Filante SLR ID2 as a highly refined, mature race bike that prioritizes stability over erratic agility. Rather than demanding constant micro-corrections, the chassis feels "deeply reassuring" (Road.cc) and becomes increasingly composed as velocities rise. Testers noted that the bike handles high-speed descents "without so much as a hint of nervousness" (Granfondo), making it an excellent platform for riders who want to maintain power through sweeping corners and crosswinds. The carbon layup, which incorporates liquid crystal polymers, also earns praise for muting road buzz effectively for a dedicated aero frame.
While the aerodynamic performance is widely validated, the proprietary Aerokit hydration system presents a clear tradeoff. The custom bottles and cages contribute to measurable drag reductions, but testers found they have "limited day-to-day practicality" (Granfondo). The bottles cannot stand upright on a table, require precise alignment to dock, and can occasionally rattle on rough pavement. Standard round bottles fit into the cages, but do so awkwardly. Despite these minor functional quirks, the consensus points to a highly capable machine that balances raw speed with predictable handling, rewarding steady power output over long distances.
Review: Wilier Filante SLR ID2 SRAM Red AXS
Wind tunnel tested: Is the Wilier Filante SLR ID2 really ' ...
Wilier Filante SLR ID2 first ride review - An aero bike I ...
Wilier Filante SLR ID2 review: First ride on Wilier’s watt-saving aero bike
Review: The new Wilier Filante ID2 muddies the 'who's an ...
New Wilier Filante SLR ID2 2026 in Review – Race Refinement To Squeeze Out Those Final Watts
Compared to.
Most-viewed comparisons.
