Tire Size / Speedometer Calculator
Just upgraded to bigger tires and now your speedometer is no longer accurate? You should probably fix it, but you just spent all your money on tires and there's nothing left for the speedo gear and you don't have a GPS. Now what? Easy. Enter your original tire size, your new tire size and any speedometer reading, hit the calculate button and presto, the calculator shows your speed adjusted for the difference in tire sizes.
The formula is simple: (New Tire Size / Old Tire Size) * Speedometer MPH = Adjusted MPH