Whoopsy:

Wasn't at launch. McLaren slap the 12C option tires on when they found out the performance of the competition. 

12C was originally delivered with PZeros, with the PZero Corsas as an option tires. Then later they added Trofeo R as another option tires.

They have since calibrated the ECU to those tires, but the car wasn't designed with the Trofeo R on. But then again the P1 is a souped up 12C after all. 

 


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Surprised that McLaren couldn't get Pirelli to make one in the right size!