Tire sizing help?

[Ben]

Hi...

I have some 225-50R16 snow tires on my 1990 200.  Got 'em secondhand,
and put a bunch of miles on them with less than optimal alignment, and
now they suck.  I'm looking to get a new set, but here's the question:

The tires seem to be a little on the wide side for the rims (not sure
how wide the rims are!).  Also, stock of snow tires is not great at
this time of year, especially if you want Hakkas.  Could I get 215-
somethings instead?  What is something?  It seems that 215-55s would
be too large-radius, but I don't know the details of the calculation.
215-50?  Anything else?

Thanks!
-Ben