Picked up straight off an M3/M4 on to my E89 Z4 35i 8)
255 35 19 in the front and 275 35 19 in the rear! Rears need to drop down to a 30 profile really... but will try keep as wide as I can of course
Was on 245 30 20 and 285 25 20. Them wheels and tyres are now for sale, gutted as the tyres are brand new on the rear!
I think I will go for some 265 30 19 and 245 35 19. Same widths as E92 M3 wheels and they felt great and should allow a bit of breathing room around the wheel arch