RPM stands for "revolutions per minute," which refers to the number of complete rotations a bike's pedals make in one minute. To determine how fast 70 rpm is on a bike, we need to consider various factors, such as the gear ratio and the wheel size.
Assuming you are referring to the pedal cadence (pedal revolutions per minute), the speed of the bike would depend on the gear you are using. A higher gear allows you to cover more distance with each pedal revolution, resulting in a higher speed.
Without considering these factors, it's challenging to determine the exact speed associated with 70 rpm. However, as a rough estimate, you can consider an average cadence of 70 rpm to be a moderate pace for cycling. In general, experienced cyclists tend to maintain cadences between 80-100 rpm during regular rides, but this can vary based on individual fitness, terrain, and other factors.
To calculate the speed more accurately, additional information such as the gear ratio and wheel size would be required.