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Speedo Recalibration FYI...
My rig info:
2012 F350 Lariat, Build date 1/12...
For those that are looking to go with larger tires and want to have the speedo recalibrated, this is what I learned. I upgraded the size of my tires to 325/60 R20 and went to the dealer to have the speedo reclibrated. When they gave me back the truck they told me they set it to that specific size. I thought I would double check and do a GPS comparison. It was still about 3 - 4 MPH off. I called them back and they said it will take a 20 mintue trip for it to recalibrate. (Weird but thought whatever.) Many trips later still off by 3 - 4 MPH. I found a local garage (to have them change the TPMS setting, another story) and took it down there. I had him verify the tire size in the computer and this is what it showed. The max tire size available to choose is 275/65 R20 and that is what it was set to. That is why I'm still off 3-4. Attached is the photo of the parameters allowed. So I guess the only way to go bigger is with a tuner.
2012 F350, Leveled, 325 60 R20 BFG AT, 20" Stryker Wheels
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