In Formula 1, tyres are broadly divided into dry and wet tyres. According to the temperature and speed of the track, dry tires are divided into five types: purple ultra-soft tires, red super soft tires, yellow soft tires, white neutral tires, and orange hard tires.

Wet tires are divided into two types: full rain tires and semi-wet tires.

Among them, the all-rain tires are blue, generally known as blue tires, which are used in heavy rainy weather. Semi-rainy tires are also called green tires because the tire margin is green, and they are used when the rain is very small or there is not much water in the area of the land that has just rained.

And now, the wheels of the Williams No. 2 car are equipped with blue all-rain tires!

In F1 prior to 2018, cars were only allowed to pit and change tracks when there was clear rain on the track and the "rain card" was lit up. But with the revision of the '18 rules, in order to achieve greater tactical variability, the official has allowed the team to freely choose the timing of the pit stop to change the tyres.

However, most of the teams will still choose to follow the previous tire change method, that is, the road is flooded before entering the pit stop to change tires.

There are two main reasons for this;

The first point is that there are seven annular longitudinal tire grooves on the full rain tire, which is slightly narrower than the longitudinal tire groove on the dry tire and supplemented by an oblique arc tire groove of equal width, which radiates to both sides with the central longitudinal tire groove as the center, so that the water can be squeezed out in an orderly manner while effectively destroying the water film between the tire and the ground, so as to ensure that the tire obtains the maximum grip.

Compared to dry tyres, a car with rain tyres has a better top speed than a dry tyre on waterlogged roads and makes the car easier to control.

However, the rolling resistance of all-rain tires is relatively large, and the consumption of power transmission is relatively large, so the top speed of this tire on dry land will be greatly inferior to that of dry land tires.

Because the force of the longitudinal tire pattern and the tire material are soft rubber relationships, the rain tires wear out greatly when they are dry.

That's why almost all fleets will only replace when they see heavy water on the road.

Now, although the sky is cloudy, no one knows when the rain will come. Weather is one of the most difficult factors to control in sporting events, so almost all teams choose to be conservative.

If you choose rain tires at the beginning of the race, in case it doesn't fall for more than ten minutes, wouldn't it be a waste of a set of tires?

Therefore, the tactics of the Williams team made the audience and the commentary incomprehensible.

"Oh my God, did Williams's technical guidance take drugs last night? Now I changed into a rain tire early, what if it doesn't rain after a dozen laps?"

"yes, all the teams are running on slick tires, so they will be a lot behind at the beginning of the race because of the tires!"

"Fkit! I started in fourth place yesterday, so it's all wasted!"

In the midst of the noise in the stands in the starting area, sure enough, the Williams No. 1 car had fallen from fourth to fifth.

However, although the commentators and the audience complained about the Williams No. 2 car, all the team members were calm in the team's pit lane.

The request to use wet tires was made by Xavier himself before the game. And this request was also adopted after the study of Alonso and the tactical guidance of the team.

On the track, Javier watched the cars pass by him without a smile. Let the engines around you roar, just move steadily on your own terms.

Through the two days of practice and qualifying, he already has a deep understanding of the power level of the new car. So even though he is now using all-rain tires that are lacking in top speed, with the good power output of the car, after falling behind by two cars, he still firmly occupies the sixth position with his solid technology. And on the premise of controlling tire wear, slowly pull up the speed.

By this time, the clouds in the sky had become thicker.

Hamilton was firmly in the ascendancy at this point, and with the convenience of starting the grid, he was pushing hard for lap times in an attempt to confirm the advantage at the start of the race.

His current car is equipped with a set of white neutral tyres, which correspond to the temperature and humidity of the current track, bringing out the full performance of the Mercedes-Benz car.

In Hamilton's view, because of the uncertainty of the weather, it is important to set aside at least one pit stop to change the tyres.

With the engines of more than 20 racing cars roaring, time passed little by little. One, two, three......

Immediately, seven minutes passed the game. By this time, Hamilton had already completed four full laps. With the lap time pushing hard, the white medium tyres were already damaged to a certain extent. From the rearview mirror, Hammerton clearly saw that the marginal part of the left and right rear tires already had a flash.

But at this time, through the team's internal communication, he learned that he was already 12 seconds ahead of the Restfast No. 1 behind him.

In such a situation, he intends to slow down, get the most out of this set of tires, and move on.

In this way, in a very short time, two laps were completed in a hurry.

The tires currently used by Mercedes-Benz are Bridgestone tires, and in order to pursue performance, Bridgestone's wear resistance is not very good. Normally, eight laps are almost a set of tyres, but Hamilton had already run six laps at top speed, and in the middle of the high-speed drive, he noticed that the tyres had begun to fall off.

This was a very dangerous sign, and he immediately asked the team to pit stop.

By this time, Javier was already behind in eighth place, and in the overall standings, he was as much as 42 seconds behind Hamilton in first place.

With that advantage, Hamilton pitted quickly. It took just over two seconds for the team to get him on a new tyre.

Quickly back on the track via the sideways, Hamilton still held the lead. Although he has fallen to second place overall, his tires are brand new compared to the No. 1 car behind him!

This was enough for him to regain the first place when the No. 1 car in Refa pitted.

However, at this time, Hamilton looked at the clouds above the track, which were already very low, and had some bad premonitions.

"Did Javier make a pit stop for a change of platform?" he asked via the team's internal communications.

"Not yet!" came the voice of the technical director.

It was also at this time, with a muffled thunder, that raindrops poured down from the sky. There seemed to be no pause, and the raindrops suddenly turned into a curtain of rain!

Hamilton was in the middle of a three-turn and he only felt that by the time he came out of the corner, the car had become out of control.

As rain cards began to play on both sides of the track, teams asked for pit stops to change tires.

It was at this time that Javier, who was already in ninth overall results and had been complained about since the beginning of the game, exerted his strength!