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Originally Posted by LuckyW
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I think you're missing the point.
When you maintain the stock wheel and tire sizes on 19,20,21… you don't need to calibrate the suspension. This is from personal experience as I have ran all 3 stock sizes and I am very familiar with the calibration system. You aren't changing the overall circumference of the wheel/tire combo. So suspension heights remain the same. Ask any BMW dealer to confirm.
If I were to go outside of those stock parameters increasing or decreasing overall circumference, then I will need to calibrate the suspension to adjust for the differences in sizes and keep a stock suspension setup and yes, it could impact safety systems and components if you're not running the proper parameters. Example, you decided to do 245/45/20 in the front and 275/30/20 in the rear. You'll have roughly an 8% difference in circumference front to back and difference in revs per mile which will throw systems off. They need to be in alignment and the rule of thumb usually is not more than 3%