Originally Posted by
Psimet2001
+1. Tar is a red herring. It's a Conti so yu should have wear holes in the riding surface of the tires. If you can't see any then....that's because they are gone and should have already been replaced.
Well, all the gunk in the same area lead me to think it might have been debris caused. I don't see the wear holes on these. They are 4 seasons not 4000s. Maybe they are completely worn, but the front still looks good and I don't see the holes there either. However, the back at least is probably done for as you say.
On a side note, these did not get the milage I would have expected. I think the 4000s have lasted longer but I haven't been tracking it that well.