Can't really help as I have the 3.0TDI on 17" but I did try the
http://www.audi.co.uk/owners-area/se...udi-tyres.html
Audi tyres just to see what they would supply as AO (Audi original) and after some research of tests on
http://www.tyrereviews.co.uk and searching prices (
http://www.tyreleader.co.uk was cheapest ) I ordered the ones Audi 'recommended' and had my alloys powder coated at TWS and the new tyres put on there.