Originally Posted by zachr

Several manufacturers have options for a specific tire - for example the Z07 package on a vette always comes with Cup2s. Mercedes has, in the past and on certain AMG models specifically, allowed you to spec summer tires which were PS4S at the time. I don't know that they're worded such that they have to come with PS4S though -- I assume it's always subject to supply and they can substitute a similar tire at their discretion.