They do many things. One issue with an overtyred car is the loss of progressive breakaway laterally. In a straight line the best thing to improve grip is lowering tyre pressure.
Slightly wider tyres at the same pressure make a wider but shorter contact patch.
It all rather complex anyway and mechanical keying to the surface is the main method of generating grip. This is often achieved by softer compounds, hence tyre choice is more important than width in the context of this thread.
Slightly wider tyres at the same pressure make a wider but shorter contact patch.
It all rather complex anyway and mechanical keying to the surface is the main method of generating grip. This is often achieved by softer compounds, hence tyre choice is more important than width in the context of this thread.