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Old 12-12-2014, 04:31 PM
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Default Speedometer Calibration

So, I installed 35x12.5 tires on my truck an adjusted the tire size through the DS Trinity to 35" tires and according to my GPS speedo, the truck read 80mph, but I am only going 75-76mph. What am I doing wrong to get it calibrated?

I apologize in advance, was not sure if this post should be here or in a tuning forum..
2012 1500 4x4 Big Horn Crew Cab, Deep Cherry Red, Pro-Comp 2.5/1.5 Leveling, Red Dirt Road "Dirt" 20x9 -12 offset, 35x12.50x20 Toyo Open Country II Extreme, Vararam Intake, Diablo Trinity, TonnoPro Tri-Fold, Husky Liner WeatherBeater Mats.
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Old 12-13-2014, 09:57 AM
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Will probably be trial and error. When I had my 2010 with a Superchips Cortex, I had to put a shorter tire in to get my speedo correct. Just try a few different sizes until it is right.
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