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It has been quite a while since I have tuned my vehicles. And since then I have replaced those that were. So this will be the first time I am using 4.0... I seem to remember the tire wizard allowing you to put in custom tire sizes to calibrate the speedo. But no longer. My stock tire is a 285/45/22 with a gear ratio 3.42. The tire wizard says tire size 30.87. I don't want to change the gear, just new tires with dimensions 305/45/22... So how do I calculate the new tire size?
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Nevermind... Found my answer...
