Hi Team
Are you aware that Pirelli have made the 235/60R15 P600 again? This tyre is now distributed by the Pirelli Collezione distributors. this will assure good service and fresher stocks. Visit cinturato.net to find your local distributor
I thought Pirelli went out of the passenger car tire biz a long time ago (or at least exporting them to the U.S.)? 
they arent a problem they are with Lucas Tires
to make sure the stocks stay fresh Pirelli sell these small production tyres through their specialist distributors.