Hello,
I just purchased a used 2005 A4 2.0t quattro which has 17" wheels on it. Front tires are "all-season" and rears are "M+S". I don't know why the owner decided to go for this match.

So, here are my questions...since I live in Bosnia and conditions can be rather snow in the winter and rather dry in the summer, so what would be the best thing to do? I also own 15" M+S tires (and 5-hole steel rims from Alfa 147 which I think will fit on A4) so if my old rims won't fit, maybe it would be a good investment to buy 15" rims for A4?

I guess I understand how quattro works, but does it matter if tires are made for different purpose?