[rjc32000]

Forgive my ignorance, but I'm about to order a set of Bridgestone Blizzak WS70s for my X Drive M Sport, which I don't actually have yet.

WHat size tires do I order? I assume that since I have a "square" set up, all my wheels/tires are same size? 225/45R18, right?

Thanks in advance, and apologize again for what probably looks like a silly question to many of you.