1. Select the wheels. Many companies manufacture wheels for Audis, so there are many choices. Companies such as BBS make very high quality wheels, or you can use OEM wheels from a different Audi model. If your Audi is not an S model (S4, S6, RS4, for example), then installing a set of larger wheels from one of these models is a way to upgrade the wheels and retain a factory appearance.
2. Purchase the proper tires. When selecting tires, take into account what you will be using your Audi for. If you do a lot of driving in the snow or rain, an all-season tire is the best choice. On the other hand, if you live in a warm climate, an ultra-high-performance summer tire will provide impressive handling. Have a professional tire shop install the tires.
3. Park the car on a flat, level surface if you are replacing the wheel and tire package yourself. Loosen the lug nuts for the wheels with a lug wrench. Use a floor jack to lift the car and lower it onto jack stands. Finish removing the lug nuts and the old wheel. Wipe down the hub mounting surface with a rag and degreaser.
4. Slide the new wheel and tire onto the hub, ensuring that it is fully seated. Thread on the lug nuts and tighten them with the lug wrench. Lower the Audi back to the ground. Finish tightening the lug nuts progressively in a crisscross pattern to 90 foot-pounds. Finish installing the remaining three wheels. Check the tightness of the lug nuts after the car has been driven 100 miles.