I have the runflat version of the P7 Cinturato All Season Plus on my 2015 320i in 225/50-17 and they do not tramline at all... ever. However, my wife's X3 with the Goodyear Eagle LS-2 runflats in 245/50-18 tramline really bad... like what you are describing with your Pirellis.
So does that mean it has to do more with the vehicle/suspension or the size/width of the tire?
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