Rev Per Mile Calculator

Rev Per Mile Equation:

\[ \text{Rev per Mile} = \frac{5280 \times 12}{\text{Circumference (inches)}} \]

Rev Per Mile:

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1. What is Rev Per Mile?

Rev Per Mile is a measurement that indicates how many revolutions a wheel makes when traveling one mile. It's important for vehicle tuning, speedometer calibration, and performance calculations.

2. How Does the Calculator Work?

The calculator uses the Rev Per Mile equation:

\[ \text{Rev per Mile} = \frac{5280 \times 12}{\text{Circumference (inches)}} \]

Where:

5280 — Feet in one mile
12 — Inches in one foot
Circumference — Wheel circumference in inches

Explanation: The equation converts the mile distance to inches and divides by the wheel circumference to determine how many full rotations occur in one mile.

3. Importance of Rev Per Mile Calculation

Details: Accurate Rev Per Mile calculation is crucial for proper speedometer calibration, gear ratio selection, and understanding vehicle performance characteristics.

4. Using the Calculator

Tips: Measure your wheel's exact circumference in inches (including tire) and enter the value. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure wheel circumference?
A: Measure from the ground to the center of the wheel (radius), multiply by 2 to get diameter, then multiply by π (3.1416).

Q2: Does tire pressure affect the calculation?
A: Yes, tire pressure changes the circumference slightly. Measure at your typical operating pressure.

Q3: What's a typical Rev Per Mile value?
A: Passenger cars typically range between 700-900 revs/mile depending on wheel/tire size.

Q4: Why is this important for speedometers?
A: Speedometers calculate speed based on wheel rotation count. Incorrect Rev Per Mile values will cause speedometer errors.

Q5: How does this relate to gear ratios?
A: Combined with transmission gear ratios and differential ratio, it helps calculate engine RPM at specific speeds.