How to see the model of tricycle tires?

The view of the tricycle tire model is actually relatively simple. The tire model is generally written on the side of the tire. For example, 180/50 ZR 16 is used as an example. 180 refers to the cross-sectional area of the tire is 180 mm, and 50 refers to the aspect ratio of the tire. It is 50, R refers to the radial structure, 16 refers to the diameter of the wheel is 16 inches.
In addition, some tricycle tires use imperial nomenclature, such as 4.00 H 18 4PR, 4.00 represents a tire width of 4 inches, an aspect ratio of 1, H represents a speed rating, and 4PR represents a four-ply carcass structure ply.