TurboT: I am going to buy AEZ 18" Yachts rims and Conti, Nokian or Pirelli Ice (new from last winter) with studs. All with STD design - not runflats. Cost about 50% of BMW original run flats.
There are pirate tirepressure sensors from major suppliers (one of them suppling to X4) , that can be calibrated for the X4 wireless system. Cost about 70% of original sensors.
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