Just a little information for you guys for reprogramming your tires for the speedo. Just because a tire says its a particular height doesnt mean it is. LOL
For example when I installed my 37" measuring the actual height on the truck with weight on them at a particular tire pressure they actually measured 35.5" which makes a huge difference of up to 5mph on the speedo
So these 40" actually measure 38.5" so I had to use that figure in my calculations for the rolling dynamic tire circumference which came out to 3070.6mm
Tire pressure and the weight actualy sitting on the tires makes a big difference if you want your speedo to be dead accurate
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