The rims are 19 x 8.5 front and 19 x 9.5 rear, just like e90. The only difference between 1-series and 3-series rims are the offsets, and spacers take care of that.
The Achilles tires are actually pretty nice. I had never heard of them when I purchased this set but they ride nice, look good, and the traction is as good as the Hankook Ventus V12's I've used in the past. I priced this set so aggressively because I realize the tires are not a big name brand....but they perform just fine and are practically brand new.