Will calibrating my speedometer to prove it is 10 mph under what it really is get me out of a speeding ticket?

I recalibrated mine,

37" from stock 32.5"

On some trucks the factory can do it, by entering the actual rotations of the tire per mile.

Easy to calculate, but some factory mods will only allow a low number limit and not low enough to compensate for the actual rotations.

You can by one that attaches to the wheel sensors, but they are expensive.

You can also rent a computer to change the programming on your truck as well,

Either way, I doubt this will save you the ticket, because they will probably go after you on height restrictions on your vehicle if your in one of thos states that bust chops.

headlight height 45" to center max, bumper height 23" to bottom, you know the routine, they will hit you with something else.

Good luck..

Pay the ticket. If you know your speedometer shows less than your actual speed it is not that hard to just subtract 10 from whatever it shows. No you wont get out of paying with that excuse.

no it will not, the judge will see it as you new of this problem which if you anything about trucks and lifting you would have known about this, so it is your fault that the your speedometer is calibrated, to calibrate it will cost you a couple 100

Sorry, but it doesn't matter what your speedometer says. You get a ticket for how fast you're going, not for how fast you think you're going.

Ask the courts if you may take a traffic school class. Very slim you can beat it.