Ever been standing around a car show and heard one guy ask another… “Hey, what gears you got in that thing?” Ever wonder the reason for the question? Well, gearing has as much to do with how a car performs as the engine. The gears you’re running determine everything from your acceleration and top speed, to fuel economy. Here is a quick online visual calculator that is pretty basic, but incorporates everything you need to know. Simply input your rear axle ratio (you can add a custom ratio if you choose), your tire size, transmission gear ratio and then hit the gas… it’s actually quite a bit of fun to experiment. It may also answer some questions you may have about how to set-up your ride.