Hello! I looked at the rear tyres of her Citroën C3 (1.4) year 2003 for a friend. She has been driving winter tyres on the rear axle since about 2011. The tyres are loud when driving (“wummering” and seem to run round. In my opinion, there is clearly saw tooth formation here. In addition, it makes me stutzig that the tyres are round and some profile blocks are significantly lower than others. I wonder if it could be that There are damage to both tyres inside the carcass. No further damage is visible on the outside. Is there a safety risk with the tyres or can you drive with it for a few months if no further damage is seen and the profile depth is sufficient? With photos and a video. I am happy about many, detailed comments and thank you for your assessment!