2. Field inspection: If you have purchased a single-cylinder diesel small four-wheel tractor, you can directly measure its track, wheelbase and tire size. The track distance refers to the distance between two adjacent tires, and the wheelbase refers to the distance between the front and rear axles. By measuring the diameter and width of the tire, the size of the tire can be known.
3. Consult the user manual: If you can't know the chassis size through the above methods, you can consult the user manual, which usually provides information about the chassis parameters.
4. Consult the dealer or manufacturer: If you are in doubt about the chassis size, you can consult the dealer or manufacturer, who can usually provide detailed chassis parameter information.