How are car grades classified into ABCD?

[VonAaron]

The method for classifying car grades into ABCD is based on parameters such as the vehicle's external dimensions, interior space, wheelbase, engine displacement, etc. The primary criterion for classification is the wheelbase. A-segment cars (including A0 and A00) refer to small cars; B-segment cars refer to mid-range cars; C-segment cars refer to high-end cars; and D-segment cars refer to luxury cars. A-segment compact cars have a wheelbase between 2500mm and 2700mm, a body length between 4200mm and 4600mm, and an engine displacement between 1.6L and 2.0L. B-segment mid-size cars have a wheelbase between 2700mm and 2900mm, a body length between 4500mm and 4900mm, and an engine displacement between 1.8L and 2.4L. C-segment large cars have a wheelbase between 2800mm and 3000mm, a body length between 4800mm and 5000mm, and an engine displacement exceeding 2.4L. D-segment luxury cars have a wheelbase exceeding 3000mm, a body length exceeding 5000mm, and an engine displacement exceeding 3.0L.