2015 F-450 - 19.5 Factory Wheels/Tires
The Feb 2014 4WheelOffRoad mag (pg 17) indicates that the 2015 F-450 will come with commercial 19.5 wheels/tires and a beefed up chasis. Brad
Forum Discussion
Well, one way for sure the engine calibration has to be changed for the F450's is the max speed. 19.5" tires usually have speed ratings in the 70-85 mph range. The OEM Continentals on mine have an "N" speed rating which is supposed to be 87 mph. The ECM limits the trucks top speed to 85. There are probably other parameters that are changed as well to enable the truck to tow and haul at max capacity without melting down.
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