Moin, I just discovered this in the photo on my little one, on the back left. Mounting or curb or anything else? I can almost 100% exclude the curb as we have no one-way roads and therefore are not parked on the left, on the other hand you can see that the tire seems to have pressed against the rim otherwise the clear varnish would not be discoloured.. What do you think? PS: the tires were only installed 2 weeks ago.