Width
Nominal tyre width (section width) in millimetres. This is one of the notation options; in addition to it, there may also be a designation in inches, for more details, see "Width" above.
Width — whether in millimetres or inches — is one of the parameters that determine compatibility with a particular rim (the other parameter is the fit diameter, see above about it). The main criterion for choosing a tyre in width is the manufacturer's recommendations for a given motorcycle model. It is highly undesirable to deviate from these recommendations: although some types of motorcycles (for example, road bikes) allow a width deviation of +/— 10 mm on the rear wheel, such a wheel will still function in a mode that differs from the standard one. On the front wheel, no deviations are allowed at all.
Rim diameter
Tyre inner diameter. This value must correspond to the rim diameter of the wheel on which the rubber is planned to be installed — otherwise the installation will not be possible. You can find out the size of the wheel from the documentation for the motorcycle, from the markings on it, according to the characteristics of the old rubber (if the tyres are bought for replacement), in extreme cases, you can measure the diameter of the disk yourself.
Now on the market tyres with the following diameters:
10",
11",
12",
13",
14",
15",
16",
17",
18",
19",
21".
Load index
The load index indicates
the maximum weight load that the tyre can safely carry in normal operation. To shorten the marking, this parameter is denoted by a two-digit number; you can translate this designation into a specific weight in kilograms using special tables.
This value must not be exceeded — otherwise the tyre may burst at any time due to off-design loads. At the same time, when choosing motor tyres for this parameter, it is worth remembering that the load is distributed unevenly between the front and rear wheels. However, the task is facilitated by the fact that motorcycle manufacturers can indicate the minimum or recommended load indices for the front and rear axles in the documentation for their equipment.
