Nice write-up, but why the chains? I drive with snows here in the mountains and haven't had issues in my E90. I guess good to have in an emergency but I wouldn't put them on unless it was REALLY bad (and still not sure I would do it.) Also, not sure if it is the angle, but your rears look a little worn for snows.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18