This calculator is a useful tool that will do the math to help you figure out the gears that are needed to make your speedometer work correctly.
- Drive Gear Teeth - The Number of teeth for the transmission
- Rear End - Rear Gear Ratio (3.89, 3.08, 4.11, etc.)
- Tire Height - Please use Inches when measuring
- Speedo Revolutions Per Mile - The number of RPM's the speedometer needs to turn at 60mph