How fast are you going in rpm when driving 55mph?

To calculate the RPM (revolutions per minute) when driving at 55 mph, you need to know the tire diameter. For example, if you have a standard tire size of 26 inches, you can use the formula: RPM = (MPH × 5280 feet/mile) / (π × tire diameter in feet × 60 minutes/hour). Plugging in the numbers, you would find that at 55 mph, the RPM is approximately 600-700 RPM, depending on the specific tire size. Adjust the tire diameter in the formula for different tires to get the exact RPM.