What happened: McLaren and Mercedes have debuted new rear wings ahead of the Monaco GP, according to Sky Sports F1. The changes arrive before running at one of F1's lowest-speed, highest-downforce circuits.

Why it matters: Rear-wing choices can be especially visible at Monaco, where teams prioritize grip and cornering stability over straight-line speed. The update also adds another layer to the constructors' fight involving McLaren and Mercedes.

What to watch: Watch Friday practice and qualifying pace to see whether the new wings translate into usable lap time. Scrutineering and rival reactions could also shape the weekend narrative.