Scirocco Central

My neighbour wanted to use my spare for his Audi TTS however it didn't fit over the brake calipers. I then noticed that my spare was only a 16" rim where as my standard rims are 19". When putting the spare up against the standard rims it was obvious that the overall rolling radious was much less on the spare, is this right or do I have the wrong spare wheel?

I'm not really sure about the Scirocco, but my brother once owned a Honda Civic Type R and the spare wheel had to be mounted in the rear because of the brake calipers also.. So, if a front tire blows, he needed to change one rear wheel to the front, and then mount the spare on the rear... Maybe that's the case here too?

Cheers