It doesn't take tread depth into account, and those measurements are at the belts inside the tire, under the rubber. You can see how that would affect the measurement. The gears in the car and the odometer/speedometer turn a specific number of revolutions to make it count 1 mile. That's what I'm looking for. With that information, you can reference ANY tire for proper fit regardless of your wheel dimensions.

Really, I'm not a lunatic. :screwy: