cant be measured in mm... nor will you know out of round spec or taper. There are special tools for this purpose and it is difficult to measure without them.
Good day. I'm a proud owner of a Proton Inspira 2.0E. 2012 model, purchased & collected 30th July 2013 which makes my car is only 6months old. All 4 tyres are Continental which came with the car.