275/30/19 will work but it's a little wide for a 9" wheel. I would recommend 255/35/19's for the front and 275/35/19 for the rear which will be a better match for the 9" and 10" wheels.
'08 E90 M3 - Alpine White - Sold
'13 E92 M3 - Silverstone II - Sold
'04 E46 M3 - Jet Black - BBS E88, KW Clubsports, Brembo BBK, SuperSprint Exhaust