Quote:
Originally Posted by Ænema
The AP is using the ABS signal for MPH/distance calculations so that automatically takes wheel diameter into account.
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No, it doesn't take wheel diameter or tire size into account; but since it uses the wheel speed sensors any changes in gearing (rear end or transmission) won't matter to it. All it can do is measure each time the wheel turns; how far the car moves for each revolution is a mystery to it. Bigger overall circumference of tires will cause the speedo to read slower (and thus the AP slower), shorter tires will cause it to read fast.