Mercedes stuck with unstable new spec as Antonelli struggles in Singapore

Key points

• Mercedes cannot revert Antonelli's car to the previous spec due to parc ferme rules and the two-day time required to convert the chassis.
• The new upgrade package is described as 'nervy' and less stable, particularly in slow corners and high-speed entries, costing confidence.
• Russell qualified second using the older spec, while Antonelli finished seventh, half a second behind his teammate.
• The split-spec strategy was a deliberate experiment to compare performance, as Russell had little to lose due to a grid penalty.
• Toto Wolff suggested future upgrades may be introduced in smaller steps to mitigate the risk of such performance dips.

Background

Mercedes had previously dominated the 2026 season but faced performance issues at the Bahrain Grand Prix in Malaysia, where both drivers struggled and Russell suffered an engine failure. The team introduced a major upgrade package at that race, which is understood to be their last big upgrade of the year. The current Singapore weekend is the second consecutive event where Mercedes has looked vulnerable, prompting the split-specification strategy to diagnose the issue.

How outlets are covering it

Motorsport.com emphasizes that the upgrade is not a failure but is 'trickier to drive,' with Bradley Lord noting the car's balance is less consistent. Sky Sports highlights Antonelli's own assessment that the car is 'very unpredictable' and 'difficult to put a lap together,' while also noting Wolff's suggestion that Mercedes may rethink its upgrade strategy to use smaller steps in the future. Both outlets agree that the split-spec test was a deliberate experiment, but Sky Sports places more weight on the driver's subjective experience of the car's instability.

Why it matters

The inability to revert to the previous specification means Mercedes must manage a potentially unstable car for the remainder of the Singapore weekend, which could impact Antonelli's championship lead. The outcome of this test will influence Mercedes' future development strategy, with Wolff suggesting a shift to smaller, more incremental upgrades to avoid similar performance dips. The split-spec strategy also provides crucial data for understanding the new package's performance ceiling and its practical limitations.

What to watch

Mercedes will attempt to find a more stable baseline for Antonelli's car during the Singapore Grand Prix weekend. The team will monitor the performance of the new upgrade package in the sprint race and main race, with the goal of understanding its full potential and addressing its current instability. Toto Wolff has indicated that the team will review the data from this weekend to inform future upgrade strategies, potentially shifting to smaller, more incremental changes.