winter question again
Ok, I previously asked whether the 18" fit the 997S and I was told they do.
Now, the car I am looking into has the -20mm LSD option which I saw requires the 19" on the base carrera. First what is the reason for that option to require 19" and second, does it mean that a 997S with the LSD/20mm cannot take 18" for winter?
Many thanks !!

Many thanks !!