Loren wrote;
 I'm driving a '90 Westy with 14" alloys,
Michelin Agilis 185R14 tires.  The other was an '87 Westy running 16" wheels
and tires, Nokians, don't know the exact size.

Loren,
I wonder what size 16" tires Phil is running?  (Let us know Phil).  If they are 55 series then the overall circumference may be similar to your tires.
George
'85 Westfalia