People generally go with either
215/40/18 and 245/35/18 (OE for 135i)
or
225/40/18 and 255/35/18
These combos match the front and rear overall tire diameter the closest.
But you may run into some issues with being lowered and the 255 rear (but maybe not)
If you really want to dig deeper, this is my favorite wheel and tire size calculator:
https://www.rimsntires.com/specspro.jsp
Plug in your new and old wheel and tire dimensions and it will tell you how much more the tire will stick out. Then go examine your current setup and see if you have room