I need replacement tires for the F12. I prefer Michelin over Pirelli for a host of reasons (not going to debate that here). I presume the best option is Michelin SP4s. Oddly, the rears are unavailable. I do not want the old original Pilot Super Sports and the SP4 is not available for the front tires. Can one mix SP4 (rear axle) and SP4s (front axle)? What to do?
You do not want to mix tires. I think the MPS4S can be had in the F12b sizes- though they are not K (Ferrari) spec. I wouldn't worry too much at this point- I think the standard MPS4S would be better than K Spec MPSS for the F12. I have the standard (non-K) spec on MPS4S on my 458 and love these tires. Front https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Pilot+Sport+4S&sidewall=Blackwall&autoMake=Ferrari&autoYear=2016&autoModel=F12berlinetta&autoModClar=Standard%20tires&frontTire=535YR0PS4SXL&i1_Qty=2&tab=Sizes Rear https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Pilot+Sport+4S&sidewall=Blackwall&autoMake=Ferrari&autoYear=2016&autoModel=F12berlinetta&autoModClar=Standard%20tires&rearTire=035YR0PS4S&i1_Qty=2&tab=Sizes