This application provides accurate top speed calculations based on your transmission ratios and differential gear ratio. It gives you information about maximal speed by each gear.
Variables that you need to fill are:
Tire dimension
Transmission gear ratios
Final drive ratio
REV limit

You can also choose between kmh and mph.
The info provided by this app is crucial for any track and motorsport enthusiast who wishes to optimize the car's gear ratio to best suit a particular track. It helps you to find the perfect balance between top speed and acceleration which is also the key point for drag racers.