A square set-up (the same size tires at all four corners) has the following advantages:
- Better winter snow traction from a more narrow rear tire
- Ability to rotate the tires for longer wear
- Simplicity of installation with all four tires being the same
- A generally lower in a more common front tire size
If you minus size to 17", the RIAL Salerno is a popular, high quality wheel choice:
To view more information on BMW winter tires, BMW winter wheels as well as wheels and tires for almost any make and model of car, begin here.