I also have 2 sets of rims for the F430, MPSS for general duties on one set and MPSC2's going on the other for Track days.
This is the way to go as on track the tires wear brutally and the thread can get ruffled, and when rolling on street can injure the suspension silentblocks, as with the rims, that specially if they´re modular, need to be checked because they can be bent or the screws can loosen.
With two sets you avoid all troubles. Congrats on that decision.
G- Have to disagree with you on his old tires. AT 6 years they need to be changed, especially on a Ferrari. Some even advocate every 3 years for a Ferrari, but I think that is overkill. I even have my 89 year old mother change the tires on her Buick at 6 years, even though the tread is not worn out. Too much degradation of the tire after 6 years of outgassing and compound breakdown. Degrades traction, especially for braking.
Its not scientifically proven yet that a tire has a "past date". It depends on the how they´re used and kept. In a city car that its under daily usage, parked on the street and because of that is suffering bumps, asphalt cracks, potholes, the heat of the summer and the chill of the winter, for sure that changing them six years after the factory date is a safe bet. But can "die" before if the difference between summer and winter is extreme.
But for a car garaged and well looked after, with the best rubber available fitted, can last longer, when there´s only street usage. I think we are experienced drivers and can feel when the tires are tired and need replacement as they become hard and grip drops dramatically. Time for a change then.
That's why in Europe we tend to have summer rubber and winter rubber (ideally in two set of rims) for cars used on a daily basis. One set lives in chilling conditions and the other in the mild temperatures of spring, the heat of the summer and the medium range temperatures of the beginning of the autumn. Thus, the rubber works always under the same thermal circumstances and the appropriate ones for each compound (as a summer compound hardens brutally when there´s 6şC or less), because the worst that happens to them is the stress induced by the difference of temperature in working conditions, that affects their elasticity and thus how their wear.
That's the reason why a six year period is the indicated "safe bet" to replace them, but that's for daily used ones. And that's why a car that doesn't move during the winter should be up on blocks (so the tires don't get squared) and when its again on the floor should run at least 60 miles a month.