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Speedometer Gear Calculator

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Calculates the speedometer gear teeth needed for a given tire size, rear gear ratio, and speedometer gear teeth.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Tire Circumference (inches), Rear Gear Ratio, Speedometer Gear Teeth, and Driven Gear Teeth (usually 1 or 2) in the units shown.

Step 2

Read Calculated Speedometer Gear Teeth and Speedometer Error (mph) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

Tire Circumference (inches): 80; Rear Gear Ratio: 3.73; Speedometer Gear Teeth: 17 Teeth; Driven Gear Teeth (usually 1 or 2): 1 Tooth

Calculated Speedometer Gear Teeth: 0 teeth; Speedometer Error (mph): -100 %

Example 2

Tire Circumference (inches): 85; Rear Gear Ratio: 4.1; Speedometer Gear Teeth: 18 Teeth; Driven Gear Teeth (usually 1 or 2): 1 Tooth

Calculated Speedometer Gear Teeth: 0 teeth; Speedometer Error (mph): -100 %

Example 3

Tire Circumference (inches): 75; Rear Gear Ratio: 3.55; Speedometer Gear Teeth: 16 Teeth; Driven Gear Teeth (usually 1 or 2): 1 Tooth

Calculated Speedometer Gear Teeth: 0 teeth; Speedometer Error (mph): -100 %

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