Jumping your 2015-2016 F150 up to larger tires means that you're going to need to get your speedometer recalibrated in order to show the correct speed and odometer mileage due to your truck's altered final drive ratio. To correct your truck's computer, you'd generally need to bring your truck to a Ford service center or get a custom tune. The middle ground is Hypertech Tire Size Calibration Tool. Specifically designed for adjusting your F150's PCM for new tires, the tool works quickly and effici

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