Thanks, very interesting. My 19 x9" #298M wheels should arrive this week and I will provide similar data prior to mounting the snows.
Odd your fronts were Borbet DE but the rears Borbet USA(AL). Many BMW OEM wheels are sourced from BBS as BMW AG is an equity partner.
'13 X5M - carbon black over black • BBS SV • "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
'11 Z4 - mojave over beige • 6 speed manual • Münich delivery
...and a bunch of old English motorcycles