Tires are like shoes... Its all compromises. And yes I do agree with the mclaren reps that choice is limited. Im sure that Ferrari has done some sort of exclusive use of michelins to insure that they get the best tires possible. And relative in terms of size and ability, Michelin is by far the largest tire maker, dwarfing Pirelli. so you can imagine the R&D capabilities of one over another... I would think once the super sport is available for the mac that it would be a very different scenario...