+1 those are E9X sizes.
Example on my E91, the sizes went from:
255/35/18 (E91) --> 255/40/18 (F31)
222/40/18 (E91) --> 222/45/18 (F31)
Also most of use will have Bridgestone Potenza S001 RFT, rather than the RE050A. I must say the ride is better on the S001 and better when it rains (IHMO)....might also have something to do with the Adaptive Suspension.