Speedometer
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Joined: Oct 2009
Posts: 51
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From: Euless,Tx
Speedometer
I just changed out my factory wheels and tires on a new 2010 FX4 (18" wheels and 275/65/R18) with 20" Monsters and 305/55/R20 tires.
How much of a speedometer over/under reporting should I expect?
Should I have the speedometer calibrated?
Will the change have any impact on my shifting?
How much of a speedometer over/under reporting should I expect?
Should I have the speedometer calibrated?
Will the change have any impact on my shifting?
<b>F150 Forum</b>
Joined: Jul 2009
Posts: 895
Likes: 159
From: Arizona, USA
Here's a calculator that will help you estimate the difference in your speedometer reading.
Tire Size Calculator
Some people have the vehicles computer updated with the new size, some don't. Its recommended that you do have your vehicles computer updated but its up to you.
Tire Size Calculator
Some people have the vehicles computer updated with the new size, some don't. Its recommended that you do have your vehicles computer updated but its up to you.