After a bit of a weather delay I finally took delivery of a gen2 997 c2s cab. Its a Porsche Approved car from an OPC. I'm very happy with it except the front tyres. At first inspection they have a lot of tread remaining, but I now realise that they are quite worn on the inside. But the biggest issue it that there is visible cracking within the tread. I also note they are date stamped 2613 so are nearly 5 years old. Given the mileage history of the car these tyres have been put on much more recent than 2013. I attach a pic of the cracks. I would appreciate peoples views whether this is OK?