**Q: What does RPM stand for?**

A: RPM stands for "revolutions per minute" or "rotations per minute." It is a unit of rotational speed and is commonly used to measure the speed at which an engine or any rotating object is turning.

**Q: How is RPM related to engine speed?**

A: RPM is used to measure the rotational speed of an engine's crankshaft. It indicates how many times the crankshaft completes one full revolution in a minute. The RPM value reflects the engine's operating speed, which is crucial in understanding its performance and efficiency.

**Q: How do you calculate RPM?**

A: RPM can be calculated by dividing the number of revolutions made by a rotating object (such as an engine's crankshaft) by the time taken to complete those revolutions, then multiplying by 60 to convert the result to revolutions per minute.

**Q: How is RPM related to vehicle speed?**

A: The RPM of an engine is related to the vehicle's speed through the drivetrain transmission ratio and the tire diameter. The relationship can be expressed by the equation: RPM = Wheels RPM × Transmission ratio. Additionally, the vehicle speed can be calculated using the equation: Vehicle speed = Wheels RPM × Tire diameter × π × 60 / 63360.

**Q: How can the RPM calculator be used?**

A: The RPM calculator allows you to compute any of the following values - RPM, vehicle speed, transmission ratio, or tire diameter - by providing the other three values. For example, you can calculate RPM when given the vehicle speed, transmission ratio, and tire diameter.

**Q: How does changing tire size affect RPM and vehicle speed?**

A: Changing the tire size affects RPM and vehicle speed due to the change in tire diameter. Larger tires have a larger circumference, so the vehicle covers more ground with each revolution. As a result, the RPM would decrease for the same vehicle speed compared to using smaller tires.