yikes, well based on 155/80R13 stock tyres my current 225/60R14 rear overall diameter is way over 1 inch larger - they are closer to 2 inches larger!
I do remember reading in a _'73_ owners manual that the some American TA22s did come with 14" rims. Hopefully they came out an inch wider too - that should make me legal and more importantly insurable, that is what I am concerned about.
BTW - I think you may have misread my post slightly regarding what tyres I actually have fitted.