Tire sizes are marked in different ways to indicate size and performance. Dimensions are usually listed on the sidewall of the tire and may include information such as width, height, rim size and maximum load capacity.
Tire sizes are usually expressed in inches or millimeters. To convert tire dimensions from inches to millimeters, simply multiply the dimension in inches by 25.4. For example, a 30 inch wide tire would equal 762 mm (30 x 25.4).
Tire sizing standards for electric bicycles and scooters are similar to those for motor vehicles, but there are differences in specified sizes and load and speed codes.
For bicycles, the most common standards are ISO (International Organization for Standardization) and ETRTO (European Tire and Rim Technical Organization), which specify tire sizes in millimeters. ISO and ETRTO standards also specify rim sizes for bicycles, as well as recommended pressure codes for different tire types.
The CE standard (European Conformity) is not a tire sizing standard. It is used to indicate that products, including tires, meet European standards for safety, health and environmental protection. Tires bearing the CE marking are certified to comply with current European standards and can be marketed throughout the European Union. It is important to note that the CE standard is a voluntary marking and is not a guarantee of quality or performance.
Loading and speed codes for electric scooters are similar to those used for motor vehicle tires, but may vary by manufacturer and local standards. Load and speed codes are usually marked on the sidewall of the tire and may include letters or numbers that indicate the maximum load the tire will support and the maximum speed at which it can be safely operated.
Charging codes for electric scooters are usually indicated by a letter followed by a number, such as "L1" or "L3". These codes indicate the maximum load supported by the tire in kilograms.
Speed codes for electric scooters are usually indicated by a letter, such as "S" for "Slow" (slow) or "F" for "Fast" (fast). These codes indicate the maximum speed at which the tire can be safely operated.
It is important to check the load and speed codes to ensure that the tires are compatible with the electric scooter and that the load and speed limits are respected to ensure safety.
The maximum speed at which a tire can be safely operated varies between manufacturers and local standards. Speed codes for electric scooter tires are usually indicated by a letter, such as "S" for "Slow" (slow) or "F" for "Fast" (fast). These codes indicate the maximum speed at which the tire can be safely operated, but they do not provide an accurate numerical value for the speed.
It is also important to note that speed codes do not take into account other factors such as riding conditions, e-scooter load and rider experience. It is therefore important to exercise caution when riding an electric scooter and to obey applicable speed limits and traffic laws.
ETRTO (European Tire and Rim Technical Organization) standards are used to describe tire and rim sizes in Europe. The ETRTO standard specifies tire dimensions in millimeters, including width, height and rim size.
There are also other standards used to describe tire sizes, including DOT (Department of Transportation) standards used in the United States and JATMA (Japan Automobile Tire Manufacturers Association) standards used in Japan. These standards may include inch dimensions as well as load and speed codes similar to those used by the ETRTO standard.
It is important to note that the ETRTO, DOT and JATMA standards are often used interchangeably, but there are differences in the specified dimensions and the load and speed codes. It is therefore important to check the dimensions and the load and speed codes to ensure that the tires are compatible with the rims and meet local standards.