[RC-Monster Mike]

I created an excel file that calculates the info. I enter tire size and motor/voltage info and it gives me speed in each gear. I have all the calculations from the tranny reduction to the diff reduction entered into the formula. I also have allotments for 1/8 diffs, center diffs, etc. in the spreadsheet, so I can pretty accurately figure out almost any combination for the e-maxx. The formula doesn't take into account wind resistance or voltage drop or tire ballooning, but with some thought when entering in the voltage (based on experience), it is very accurate. I also can adjust tire size for big foes, 1/8 buggy tires, etc..