The saga of what tyre specification will be used in 2020 continues to rumble on and remains a source of much frustration to the Formula 1 teams.
The bottom line is that they won't know until well into December whether they will be using the product that Pirelli has spent huge resources on developing for next year, or sticking with the tyres they've used this season.
Why is that so significant? It's because the 2020 tyres have a different shape shoulder, and that has an impact on aerodynamics - and specifically the way the rear tyres interact with the floor. Teams are well down the road with designing their new cars, so not knowing what they're aiming for is hardly ideal.