@The Lone Wolve: your calculation doesnt add up if you intend to drive your car for more than two years, if youre willing to change the wheels yourself even less, because:
- Changing tires from rim to rim is between 80-120€ where I live, changing wheels costs 30-50€ or you could do it yourself (e.g. save 30-120€ per change).
- 19" winter tires are more expensive than 18"
- You will have more wear on your wheels due to frequent changing of tires, putting on and off of balancing weights, etc.
plus you need the same storage space anyway, doesnt matter if you put only tires or entire wheels there and if you sell the car, just sell it with winter wheels and you'll even get some bucks back.
I might have expressed myself wrong

. Had been a long day in the West bank before crossing back to Jerusalem.
Lets do it like this;
My last car I bought an extra set of 4 rims ( exactly the same as the OE ones) and 4 x conti. winter tyres. In total I spent around 800 GBP more or less for all these 8 items.
When I sold the car to a second hand carsales place, they did not want the rims with the winter tyres because in the UK, many don't believe in them. They just bought the car with the summers on.
Today, there are 4 wheels with winter tyres in my garden. I need to wait until the winter to sell them but the rims are in bad condition ( about 8 yrs old) and like I said, here the winter is not really in demand.
To recondition the rims would cost 70GBP each. The rims is a plain boring VW design and would only be usefull as a replacement for a damaged wheel from a similar VW car.
So faced with this experience, I elected to buy just the winter tyres (without another set of rims) for the N, and have the local tyre fitting company to change them 2 times per year. They charge around 80 GBP to change all 4 tyres plus the balancing ( no disposal charge of course).
My calculation was therefore based on say 800 GBP ( the cost of buying 4 rims and 4 winter tyres and changing the wheels myself) is more costly than me having just one set of rims ( free from the car), 4 winter tyres ( say 500 GBP in total) and using the tyre fitters to change them twice per year.
The rims would be sold with the car and the tyres would have been worn anyway. Also, no more unwanted rims a few years done the line.
This method would work out for me if i keep the N for just about 4 years.
If i plan to keep the N for more than 4 years, then buying a full set of both rims and tyres would be the better, like when i had my previous car for 8 years.
I do fancy a seperate set because i used to enjoy changing the wheels myself, but money talks in the end. Furthermore, i am too lazy to sell those old rims by ebay.