After reading your informative article on Pirelli tyres, I felt I must write and offer you my experiences as requested. I have driven a ’75 Porsche Turbo for 18 months, and 20,000 miles. I changed the first set of P7s at about 12,000 miles, the rears wearing out faster than the fronts. The car has now covered 25,000 miles and the rears will soon need changing again, although the fronts have a lot of life left in them. So it looks as if the rears have a life of about 12,000 miles. I was initially disappointed at this, bearing in mind the astronomic price of them. But bearing in mind the unbelievable road-holding I suppose it is only to be expected.
The road manners of the P7 I have found superb such a vast difference to my previous Porsche, a 3.0-litre Carrera (’76), which I found a disappointment, but still far better than a 2.7-litre Carrera (’74) which I loved. The tail very rarely gets out of shape only initial understeer in wet conditions.
I hope my comments are of some use to you.
Chichester ROY PEARSE