Moin Moin dear forum! I just looked at my tyres in front and I noticed that I have such a wave-like line around the edge of the profile. Like the border between flank and tread. http://i908.photobucket.com/albums/ac281/connectab/adb74543.jpg I don’t have that much on all four tyres just at the back. Tires are Pirelli PZero Nero in 245/30 20″ Thanks already.