No mate, unfortunately I do not know the correct offset for a S2,

However alot of aftermarket wheel companys alter the offset slightly in order to make the wheels fit better.

The calculation above will give you the offset for said wheels.

The best thing to do would be use the same calculation on a standard set of S2 wheels in order to find the correct offset.

Like I say though,,, you may find using the correct offset on a wider set of wheels, may rub, therefore needing adjustment.

Personally I like standard wheels, but my brakes don't allow me to use them!

Steve