Speedo correction for larger tires?
When is it necessary to get a speedo correction for larger tires? I went from a 265/75 to a 285/75 both 16 inch. Would the height even change?
Forum Discussion
On the ford f-series and excursions, the speed sensor is at the ring gear. Ford has different wheel and tire sizes but all trucks use the same PCM's. So a ford dealer for around $50.00 can reprogram your PCM to correct the tire size.
Also, if you are looking at the Overhead display for MPG, any change in tire size will throw this off. So you would need to hand calculate the MPG's. My truck is off by 5mph with 34" tires on an F350 with 4.10 gears. My MPG's are off as well by 3-4mpg's. But this is also and Average, so that has to be taken into account.
Also, if you are looking at the Overhead display for MPG, any change in tire size will throw this off. So you would need to hand calculate the MPG's. My truck is off by 5mph with 34" tires on an F350 with 4.10 gears. My MPG's are off as well by 3-4mpg's. But this is also and Average, so that has to be taken into account.
