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What is a Speedometer Gear?

A speedometer is a device measuring a vehicle’s speed. It can be analog or digital, with a mechanical version having a needle linked to a driven gear. This gear, integral to the vehicle’s transmission output, influences the speedometer reading.

Speedometer Gear Calculator

How it Works

The calculator determines the gear size needed for accurate readings, crucial when changing tire sizes. It uses the formula:

Revolutions per Mile(R)=20168Diameter of TireRevolutions per Mile(R)=Diameter of Tire20168​

Gear Ratio(G)=Axle Ratio×R×Teeth on Drive Gear1001Gear Ratio(G)=1001Axle Ratio×R×Teeth on Drive Gear​

Steps to Use

  1. Enter tire diameter (D).
  2. Get revolutions per mile (R).
  3. Input axle ratio (A).
  4. Enter teeth on drive gear.
  5. Calculator estimates teeth needed on driven gear.

Example: For a 20-inch tire with an axle ratio of 3 and 40 teeth on the drive gear:

Teeth on Driven Gear=�×�×Teeth on Drive Gear1001=121Teeth on Driven Gear=1001A×R×Teeth on Drive Gear​=121

Frequently Asked Questions (FAQ)

  1. What is a Speedometer?
    • A device measuring a vehicle’s speed, displaying it on the dashboard.
  2. What is Gear Ratio?
    • The ratio of rotations between driving and driven gears.
  3. Components inside a Speedometer:
    • Drive gear linked to transmission output, influencing dashboard needle.
  4. How to Calculate Teeth on Drive Gear:
    • �=�×�×�1001G=1001A×R×N​

Explore More with Our Tools

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💡 Discover involute gears with our calculator and learn about gear types.

Conclusion

Our Speedometer Gear Calculator ensures accurate readings despite tire changes. Easily determine gear size for optimal performance and keep your speedometer in sync with your vehicle’s specifications.

🚗 Calculate speeds effortlessly with our speed calculator!