Originally Posted by quality_sound
There is no reason you can't use the OEM 18s but a 235 will be too narrow for the rears. The A7s are a great choice for winter duty, IMO.
TR does have caps that fit. I keep forgetting to order them for mine. Ben can hook you up.
If you will never actually drive on snow you can probably get by with all-seasons but you'll have to be much more mindful of ice. FWIW, the only real snow I drive in is on the street in my village (they only plow main roads here) and I still went with Wintersport 3Ds. They're quite good even now and we haven't had our first snowfall yet.
Caps are $15 each, original BMW.