[scubaduba]

I bought a used e70 with sport package and all for tires are currently Bridgestone Duelers in size 255/50/19. I thought these were the same as OEM. Tire rack says they should be 275/40/20 in the front and 315/35/20 in the rear. A VIN check says I have y-211 rims which are 19". So did BMW make some x5's with sport package with 19" rims? Next question is do I put 255/50/19 on all corners or some sort of stagger? Thanks in advance for your help.

Oh. Which run flats should I put on. Hopefully be decent in snow.