Резину он грубо говоря имеет в виду, rubber compound, шины из другого материала, другой резины. Вот пояснение нашлось, например: Compounds are often described in terms of their "hardness" or "softness". This does not mean literally how hard the tyres are to touch, but describes how the tyres behave on the racetrack. Harder compound tyres will be more durable than softer compound tyres, meaning that the driver can complete a greater number of laps before the tyres lose performance and they are forced to make a pit stop. However, the harder compounds will provide less grip than the softer compounds, meaning that the driver will not be able to go as fast on each of the laps they make. The choice of tyre compound is therefore a compromise between durability and grip. Choose hard and you'll be able to stay out longer than your competitors. Choose soft and you'll have to pit earlier in the race but you'll be going faster than they are and may be able to make up the difference!
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