Why Aston and McLaren are testing F1 Pirellis that may never race

The two-day test is the latest step in Pirelli’s programme of no-blanket slick running, although it is set to be compromised by rain.

Pirelli’s hope was to introduce the new tyres in 2024, but at last Friday’s F1 Commission it was agreed to postpone the move to remove blankets, and then have another look for 2025.

The decision came too late for Pirelli to change its run plan for Spa, and thus the focus of the test will remain on the…