Have recently bought a 1988 VdP automatic with (as I now discover) 315mm metric wheels.
Any suggestions for simplest way to change to a non-obsolete size? I would prefer to be able to re-use the nice VdP wheel discs.

Just joined. Metro is 1988 VandenPlas Automatic with 18k on the clock - colour Oyster Beige.
Looking to replace the original metric wheels and tyres with 13" ones