Has anyone who rides the new Conti 4000 Grand Prix noticed any threading on the side wall coming loose? It seems like the layer near the rim edge on the outside is starting to come apart. I see it on both front and rear. I'll try to get pictures. I have about 1700 miles on them. I still have about 400 miles left on the back and about 1800 left on the front. Although I do have the same 1700 miles on the front.