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KM3 37x12.50x17 Speedo Calibration...

Rubiman

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Hello all,

What are people using for the size for speedo calibration for the KM3 37x12.50x17?
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Rusty PW

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Take a tape measure and measure a front tire. The tire is not a true 37".
 

tbaker

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I bought a Rough Country recalibration kit to recalibrate my speedometer after I put on 37 inch milestar Patagonia tires but a lot of people are using the Mini Tazer with the Tazer you can change a lot of your settings in the Jeep
 

jhale1800

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I'm running 35" KM3s, but calibrated mine to 34".
After you find the optimal pressure with the chalk test, the best measurement is to double the distance from the ground to the center of the hub.
 

chsapeak

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I'm running BFG all terrain 37's and set mine at 35.86. Easiest way to do it is to download an app such as Waze which tracks your speed and match it up to your speedo when going down the highway. First setting was 35.75" and I went from "stock" 6 mph off to just 1 mph off. Then I bumped up to 35.86 and matched the gps spot on... Easy Peasy
 

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cdyoung9799

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I have the same size KM3's, and I use a Superchips Flashcal tuner. Like @jhale1800 recommended, I would chalk test to find the best tire pressure, then take your height measurement. This is the first time I've run BFG's in over 15 years, and they've been awesome so far.
 
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Rubiman

Rubiman

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I'm running BFG all terrain 37's and set mine at 35.86. Easiest way to do it is to download an app such as Waze which tracks your speed and match it up to your speedo when going down the highway. First setting was 35.75" and I went from "stock" 6 mph off to just 1 mph off. Then I bumped up to 35.86 and matched the gps spot on... Easy Peasy
What PSI size you running?
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