15 or 16 in for winter wheels for 99 A4

[FPL Inc]

Hello all---


Up here in Anchorage lots of folks buy 4 extra wheels for winter tires,
which I plan to do.

The 99 A4 I just bought has 16 IN wheels but the book says 15 or 16 are
acceptable.

For STUDDED snow tires what would you all recommend--   15 or 16 IN ??  If
 memory serves, narrower tires get more 'bite' in snow, altho I do not know
if the width of tires changes with wheel size.  The smaller tires will be
cheaper I presume-- but this is not my overriding factor

 Thanks very much for the help---- Rick