Question

Why are drag car tires so wide?

Answer 1

here,

The reason for wider tires is not that the increased contact area automatically leads to more friction (though there may be some effects that depend on the area indirectly).

The design parameter that determines the coefficient of friction between the tires and the track is the something related to the molecular compressibility of the rubber.

In other words, "the softer the
rubber, the better the friction." However, when you use a softer rubber, you need to make the tires wide enough to give them strength.

So,

"the softer the tire, the wider it needs to be", to withstand design forces and moments.