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| Diameter (In) | Diameter (cm) | Common Bike Types |
|---|---|---|
| 12″ | 30.5cm | Kids’ balance bikes |
| 14″ | 35.5cm | Kids’, kids’ balance bikes |
| 16″ | 40.6cm | Kids’, folding adult bike |
| 20″ | 50.8cm | Kids’, E-Folding, Folding, BMX |
| 24″ | 60.9cm | Kids’, cargo bikes, folding |
| 26″ | 66.0cm | Teen bikes, cruiser, dirt jump, fat bikes |
| 27.5″ | 69.85cm | Hybrid, Touring, Mountain |
| 29″ | 72.2cm | Mountain |
| 650b | 58.4cm | Touring, hybrid, city, gravel |
| 700c | 62.2cm | Road, fixie, gravel, cyclocross |
MPH (Miles Per Hour) and RPM (Revolutions Per Minute) are two different units used to measure different physical quantities. Below is a detailed explanation of the relationship between MPH and RPM.
Definition: MPH represents the distance traveled per hour in miles and is a unit for measuring speed.
Uses: It is commonly used to describe the speed of vehicles, airplanes, and other means of transportation.
Definition: RPM represents the number of rotations an object completes in one minute and is a unit for measuring rotational speed.
Uses: It is commonly used to describe the rotational speed of devices such as motors, hard drives, optical drives, and tires.
There is no direct conversion between MPH and RPM because they measure different physical quantities. MPH measures linear speed, while RPM measures rotational speed. However, in specific cases, such as the relationship between vehicle speed and tire rotation speed, an estimation can be made using certain formulas.
For example, the relationship between vehicle speed and tire rotation speed can be expressed using the following formula:
RPM = (Vehicle Speed × 60 × 39.3701) ÷ (2.23694 × π × Tire Diameter)
This formula helps estimate the tire's RPM based on the vehicle speed. Note that the vehicle speed in this formula is measured in miles per hour (MPH), while the tire diameter must be measured in inches.
In practical applications, MPH and RPM are often used in different scenarios. For example, in transportation, MPH is commonly used to describe the speed of vehicles, while in mechanical engineering, RPM is used to describe the speed of motors.
In specific fields such as automotive manufacturing and motorsports, understanding the relationship between vehicle speed and wheel speed is crucial for optimizing vehicle performance and adjusting racing strategies. Therefore, in these fields, the conversion and relationship between MPH and RPM are often studied and applied in depth.