I'm extremely disappointed with the rear Pirelli P-Zeros. I’ve bought a lot of tires over the years and these rear P-Zeros are by far the worst I've ever had for treadwear. I bought a CPO 2012 BMW M3 in June 2015. The dealer told me they put brand new Pirellis on it. After noticing significant wear on the rear tires in just a couple months, I thought the dealer had lied to me. By the time I switched over to snow tires in November, the rear tires were close to bald after about 4,000 miles. After I took the snow tires off in April 2016, I replaced the rear tires with new Pirelli P-Zeros. The fronts were still like new so I didn’t replace those. Now the same thing has happened – the rear tires are badly worn again after about 4,000 miles and the fronts are still like new. Being over 60 I'm a very cautious driver -- no drifts, no quick starts or burn outs. I love my M3 but I can't imagine why BMW selected these tires for original equipment. Other than an engineering mismatch or just poor tires, the only thing I can think of is that it’s because I drive my car mostly at lower speeds on back roads and stop-and-go town streets with very little higher speed highway driving. Interestingly, the Dunlop snow tires I used over last winter showed no wear on the front and very slight wear on the rear. Needless to say, I'm not planning to put Pirellis on this BMW again.