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tire sizes

  1. L

    Can I Reset Tire Diameter in Service Mode

    I have replaced the standard 235/45 18 tires with 255/45 18 tires on my 2021 M3 RWD. The new tires have a larger diameter (27 vs 26.3 inches). This change affects speedometer accuracy and maybe projected range, efficiency, and the like. Anyone know if there is a way to use service mode to...
  2. dietereater

    Mullet setup: Front 255/45 R19 Rear 275/45 R20 speed correction.

    No spare tyre. Model Y tyre size are 255/45 R19. Getting a 20" on the Rear 275/45 R20 should be 275/40 R20, would make the rear ride a bit higher giving it a bit more ground clearance. I would rotate the 4 off 19" in the front and also have spare wheels if needed. Speed correction and diameter...