I've just had my S3 in for a service and MOT. Everything was fine part from an advisory informing me both front tyres are perishing. Sure enough, when I took a look, there are cracks around the edge of the front tyres. These tyres were fitted by the Audi dealer I bought the car from about two years ago and have covered about 20k miles. I'm a tad surprised that these branded tyres have gone south after two years. There is plenty of tred left and they look to be wearing evenly (dealer also did a 4 wheel alignment on the car). Any ideas what could've caused this? Haven't done any track days or anything on them. Just normal driving.