The original optional Audi space saver was a 15" steel wheel, with a special Vredestein 155/70 tyre, designed to be stored deflated. It wasn't particularly matched to the main wheels, but was only intended for emergency use at low speeds and that was considered good enough.Hi, my A2 1.6 FSI Sport has 17" wheels. I'm about to buy a space saver spare. I believe the correct size is 125/70/18 with 5 X 100 bolt pattern. Can anyone confirm this gives a similar rolling diameter to the all its please? Mac.