Tyre wear on car

[Maxwell B]

I've recently bought a 2006 A4. I have noticed that there is a groove wearing on the inside if both front tyres. 

The car has 18 inch wheels fitted which I suspect are too big. Has anyone fitted 18s and had the same problem 

[Steve Q]

I'd recommend getting the tracking checked, as well as having the suspension checked. Predominantly the suspension arms as these could be affecting the tyre wear.