Mercedes pins W17 balance problems on tyre temperatures, not a mechanical fault

Mercedes has traced the strange handling problems that wrecked Kimi Antonelli's Sao Paulo Grand Prix to tyre temperatures rather than a mechanical fault, deputy team principal Bradley Lord explained in the team's post-race debrief.

Why it matters:

The finding clears the W17 of a hardware defect at a stage of the season when Mercedes can least afford one — and underlines how narrow the car's working window has become. The same W17 that spun and flat-spotted its way through Interlagos was, for long stretches, the quickest car on track.

The details:

• Antonelli, fresh from sealing his maiden title in Mexico, beat Lando Norris off the line and led early. After Mercedes fitted softs on lap 18, he reported a suspension-like sensation and a car pulling to one side.
• Two laps later the rear stepped out under braking into Turn 1, sending him spinning into the run-off, having already flat-spotted all four tyres in an earlier off at Turn 12. George Russell nearly spun at the pit exit.
• Lord's verdict: the car sat below its ideal tyre temperature window in the cool, damp conditions, popping into range and dropping back out, which produced inconsistent grip.
• The behaviour was so odd that both Mercedes drivers, and several rivals, suspected something was broken.

What's next:

Antonelli came home fifth, 41 seconds behind Norris, with Russell recovering to fourth. Mercedes leaves Brazil convinced its raw pace is intact — Lord noted the team was fastest at points, on the opening intermediates and through much of the soft-tyre stint. The task now is managing tyre temperatures when conditions turn marginal.