Thanks everyone your help is really appreciated.
to summarize
Stock rims
205 to 215 front max
225 to 255 rear max
With my 17 inch rims
205 to 215 front
215 to 225 rear
Is this right?
One more question, If I stay with my 17 inch rims, but I would like to have a smaller gap between the wheel and the tire (rear only) using the stock suspension;
Can I do
225/50 R17 ?
or 225/55 R17 ?
or 225/60 R17 ?