"When I woke up on Sunday morning, though, everything had changed at the very top of this season's previously unshakable standings: Both McLaren drivers were disqualified following car inspections that found plank wear beyond what is allowed. What does this mean? The plank-or, more specifically in this case, the rear skid-is a piece of material at the bottom of F1 cars that protects the underside of the car while also helping to regulate minimum ride height."
"The plank comes in contact with the track as a race goes on and wears down slowly but surely, and it is up to the teams to ensure that the wear doesn't lower the plank's width to under nine millimeters, from its starting width of 10 millimeters at minimum; this is always measured by the stewards for all points-scoring cars at the end of the race,"
Max Verstappen won the 2025 Las Vegas Grand Prix after capitalizing on a risky Lando Norris maneuver at turn one and holding the lead to secure his sixth victory of the season. The race produced little on-track drama besides that and a strong drive from Mercedes's Kimi Antonelli, who nursed hard tires for 48 laps and finished provisionally fourth before a five-second penalty. Both McLaren drivers were later disqualified after post-race inspections found excessive rear-skid (plank) wear. The plank protects the car underside and helps enforce minimum ride height; teams must prevent wear reducing plank width below nine millimeters from its ten-millimeter starting minimum. Stewards measure plank wear for all points-scoring cars at the end of the race.
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