Pre-race analysis

Soft-tyre degradation will reward pit-stop strategy

Before the Spanish Grand Prix at Barcelona on Sunday 14 June 2026, we studied the timing and telemetry and wrote down our predictions: how each dry tyre would wear, and what that does to the race. Pirelli gave every team the same three compounds this weekend, one step softer than last year. Here are the predictions and the chart behind them.

Horizontal bar chart of our predicted tyre degradation for the 2026 Spanish Grand Prix at Barcelona, in seconds of pace lost per lap of tyre age. One row per compound in Pirelli's colours, a marker at the centre of each predicted range. The soft, on top in red and hatched to mark it as modelled, is the longest band: about 0.22 across 0.19 to 0.25, roughly three times the hard, tagged no Barcelona soft data. The medium, yellow, is about 0.12 across 0.09 to 0.16, with a thin tick showing the same compound measured here in 2025 at 0.105 to 0.128. The hard, white, is the shortest: about 0.05 across 0.045 to 0.068, the same compound we measured here in 2025. Dry-race predictions only. — Degradation is how much pace a tyre loses as it ages, in seconds per lap. The bars are our predictions for the race. The thin tick inside the medium marks what that same compound degraded here in June 2025, fuel-corrected; the hard's band is that 2025 measurement itself, the same compound a year on; the soft has no 2025 data, so its band comes from our model, and the chart marks it as modelled.

The shape of the prediction is simple. The soft should wear about three times as fast as the hard, fast enough that no one can simply run it, so it is a launch or late-sprint tyre, not a stint plan. The medium is the workhorse, but it pays for the pace: by lap 15 it is already giving up well over a second a lap to fresh rubber. That is what makes the undercut so sharp this weekend: pitting first for new tyres while a rival stays out on worn ones. The hard barely fades, which makes a car on the hard almost impossible to undercut, and the hard the backbone of the long stint. Across 66 laps only the hard can carry a long stint, so two stops is the default shape, and the race turns on when you change tyres, not how fast you lap.

The predictions, before the race

Written down before lights out:

The medium degrades at least 1.5 times the hard, on race stints.
The soft degrades about 0.22 seconds a lap, roughly three times the hard. This one comes from our model, with no measured Barcelona soft data behind it.
A green-flag pit stop costs 21–24 seconds. Measured here last year: 22.5 seconds median.
In a dry race, the winner's longest stint comes on the hard. The backbone claim, made where it can fail.

If the race is wet, the wear predictions do not stand. After the race we check each prediction against what the race measured, right or wrong. If we are wrong, you will see it in our own charts.

The basis for this prediction

Straight from the source. Every number comes from the sport's public timing and telemetry, never broadcast footage or official graphics.
One assumption, stated plainly. Our 2026 adjustment leans on a single track raced by both car generations on the same asphalt with the same compounds. That gives direction and rough size, not precision, and the 2026 tyres are a new construction, so we compare by compound lineage, not by name.
Clean laps only. The wear numbers use the laps that show the tyre's true pace, with safety-car laps, traffic, and pit-lane laps set aside.