Scalloped: That would be the correct term for what I was trying to describe! One side looked like it had hills LOLMy PR5s did last anywhere near that long, I tried every combination of tire pressure to try and milk them along but they scalloped bad on the front....enough that I changed them out at around 4500kms........
and didn't buy another set of Michelins.....
The same thing happened to the front PR5 tire on my brother's Beemer....he went to Continentals
My rear PR5 went out last September due to road debris, but front PR5 lasted another 10k miles. I sorta agree with @sixpack577 tho...I probably should have replaced the front before it started being bumpy.
I have a mileage/maintenance log now so I'll keep closer tabs on the tires' conditions and actual longevity. If I have issues with the 6 series then I'll change brands for sure.