Mercedes is investigating whether its latest W17 upgrade has made the car more difficult to control after Kimi Antonelli endured his worst qualifying session of the 2026 Formula 1 season.
The Italian’s half-second deficit to teammate George Russell raised questions about the revised car’s balance, with persistent understeer and possible rear-tyre limitations appearing to undermine the package’s potential.
The performance gap was particularly striking given Mercedes’ expectations for the updated W17. While the new components appear to offer greater aerodynamic potential, the team still needs to establish whether those gains can be consistently converted into lap time.
Mercedes investigates the impact of its latest W17 upgrade
The updated package is designed to improve aerodynamic performance, but Antonelli’s difficulties suggest that extracting its potential may not be straightforward. The car appears to be more sensitive at the rear, potentially placing greater demands on the tyres than the previous specification.
Mercedes believes it is too early to draw firm conclusions. Further analysis will be needed to determine whether Antonelli’s problems stem primarily from the setup or from characteristics introduced by the new components.
The distinction is important. An upgrade can deliver more downforce in simulations and factory testing without necessarily providing a more predictable car across different corners, speeds and track conditions.
Antonelli’s understeer could be complicating rear-tyre management
Antonelli has complained of pronounced understeer, with the front end failing to turn into corners as effectively as he would like. That can create a chain reaction that affects the rear of the car as well.
When the front tyres struggle to establish the desired trajectory, a driver may need to maintain additional steering angle for longer. This can compromise the transition to the throttle on corner exit, potentially increasing rear-tyre slip and making the car more difficult to control.
The problem is therefore not necessarily the amount of downforce generated by the revised W17, but how effectively that aerodynamic load is distributed between the front and rear axles.
Changes to the sidepods and bodywork can alter the airflow around the car and increase downforce. However, the resulting aerodynamic behaviour must remain stable when the car turns, pitches and changes direction. If the rear wheels become more exposed to turbulent airflow, the driver may struggle to extract consistent performance.
A more pronounced downwash effect does not automatically guarantee a better-balanced car. The direction, consistency and stability of the airflow reaching the rear axle are also crucial.
If the upgrade increases aerodynamic sensitivity, Mercedes could find itself with a car that offers greater peak performance but a narrower operating window. That would make setup decisions more difficult and leave drivers with less confidence when pushing to the limit.
Red Bull’s development path offers a possible comparison
Red Bull has previously worked through multiple aerodynamic specifications while seeking to combine effective downwash with improved rear-end stability.
The broader lesson is that maximum downforce is only one part of the equation. A successful package must also deliver predictable balance and usable performance across a wide range of conditions.
For Mercedes, the potential consequences extend beyond driver confidence. Greater rear-wheel slip under acceleration can make tyre temperatures harder to manage and increase degradation over a stint.
It can also compromise traction. Even when the power unit delivers its intended performance, excessive wheelspin reduces the amount of power that can be transferred effectively to the track on corner exit.
Mercedes keeps the updated specification despite Antonelli’s struggles
The decision to remove the revised front wing from the car’s configuration also forms part of the wider effort to understand the W17’s behaviour. However, a single component is unlikely to explain the full picture when the latest package includes substantial changes to the underbody, sidepods and bodywork.
Mercedes has no immediate plans to return Antonelli to his previous specification. He is expected to continue with the updated package while the team works to identify a setup that unlocks its potential.
The priority is to address the understeer without creating further difficulties at the rear. Mercedes must establish whether the aerodynamic gains can be retained while restoring a more predictable balance.
Until that work is complete, the latest W17 upgrade remains a promising development with an important question mark: whether its theoretical performance advantage can be converted into a car that Antonelli can confidently exploit on track.
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Thiago Treze is a Brazilian motorsport writer at TJ13 with a background in sports journalism and broadcast media, alongside an academic foundation in engineering with a focus on Computational Fluid Dynamics (CFD). This combination of technical knowledge and editorial experience allows Thiago to approach Formula 1 from both a performance and narrative perspective.
At TJ13, Treze covers driver performance, career developments, and key storylines across the Formula 1 grid, while also analysing the technical factors that influence competitiveness. This includes aerodynamic development trends, simulation-driven design approaches, and the engineering decisions that shape race weekend outcomes.
His reporting bridges the gap between human performance and machine development, helping readers understand how driver execution and technical innovation interact in modern Formula 1. Coverage often connects on-track events with the underlying engineering philosophies that define each team’s approach.
With a global perspective shaped by both journalism and technical study, Thiago also focuses on Formula 1’s international reach and the different ways the sport is experienced across regions.
Treze has a particular interest in how Computational Fluid Dynamics and aerodynamic modelling contribute to car performance, offering accessible explanations of complex technical concepts within Formula 1.
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