# Speedometer Calibration Calculator

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This tutorial aims to provide an understanding of speedometer calibration and the associated calculations and formulas based on stock tire size, tire size, and reference speedometer value in the field of automotive engineering. Speedometer calibration refers to the process of adjusting the speedometer readings to ensure accuracy based on changes in tire size. This tutorial explains the concept of speedometer calibration, the calculations involved, real-life applications in the automotive industry, key individuals in the discipline, and interesting facts about this topic and its significance in the field of engineering.

 🖹 Normal View 🗖 Full Page View Stock Tire Size165175185195205215225235245255265275285295305315 / 303540455055606570758085-R 8.599.51011121314151617181920 New Tire Size165175185195205215225235245255265275285295305315 / 303540455055606570758085-R 8.599.51011121314151617181920 Reference Speedometer Value MPH
 Stock tire width is inches New tire width is inches Stock tire thickness is inches New tire thickness is = inches Stock tire diameter is inches New tire diameter is = inches When the vehicle speedometer indicates MPH or KMH, the vehicle speed is actually MPH or KMH

## Example Formula

The formula for calculating the required speedometer correction factor is as follows:

Correction Factor = (Stock Tire Size / New Tire Size) × Reference Speedometer Value

Where:

1. Stock Tire Size: The original tire size specified for the vehicle.
2. New Tire Size: The actual tire size being used on the vehicle.
3. Reference Speedometer Value: The speedometer reading at a known speed (e.g., measured using GPS or a speedometer calibration device).

## Who wrote/refined the formula

The formula for speedometer calibration is based on the principles of tire size ratios and their effect on speedometer readings. While no specific individual can be attributed to this formula, it represents the understanding of speedometer calibration calculations in the field of automotive engineering.

## Real-Life Application in Industry

Speedometer calibration is crucial in the automotive industry to ensure accurate speed readings for improved safety and compliance with speed limits. By calibrating the speedometer based on tire size changes, automotive engineers can provide drivers with precise speed information. This knowledge is applied in industries involved in vehicle manufacturing, aftermarket modifications, and automotive performance tuning.

## Key Individuals in the Discipline

Various individuals have contributed to the field of automotive engineering and instrumentation. Notable figures include Ralph Teetor, known for his work on automotive cruise control systems, and Hans Zeeuw, who made advancements in automotive electronics and instrument cluster design. These individuals have significantly influenced the field of automotive engineering and have contributed to the development of instrumentation technologies.

## Interesting Facts

- Speedometer calibration is necessary when modifying a vehicle's tire size, as changes in tire diameter can affect the accuracy of speedometer readings.

- Speedometer calibration tools and devices are available in the market to assist in the process of adjusting speedometer readings based on tire size changes.

- Speedometer accuracy is crucial for ensuring safe driving, avoiding speeding violations, and maintaining vehicle performance.

## Conclusion

Speedometer calibration plays a vital role in automotive engineering by ensuring accurate speed readings based on changes in tire size. By calculating the required correction factor using the provided formula, automotive professionals can calibrate speedometers to provide drivers with precise speed information. The knowledge and application of speedometer calibration contribute to enhanced safety, compliance with speed limits, and improved vehicle performance.