Quote:
Originally Posted by Walt White Coupe
I think keeping the tires the same overall diameter is not just an XDrive issue. The "stability control" systems also require the proper tire sizes to function properly.
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Quote:
Originally Posted by Walt White Coupe
wrong. M vehicles come with different diameter tires.
The stability control systems depend on the car having the same size tire or if it came with a different diameter tires front and rear that you maintain that same ratio of diameters as originally installed.
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your second statement is different than your first. Yes, you generally want to keep the ratios the same, but it isn't critical to stability control operation like it is for x drive and your transmission. Stability control is reacting to the motion, traction, steering input and slippage of the vehicle, not measuring rotation. What he is talking about doing is a mild change in diameter and the ratios between diameter.