8716.90.10 - Parts of farm wagons and carts:

This category specifically enumerates parts for farm wagons and carts. These are components designed for vehicles used in agricultural settings for transporting crops, equipment, or other materials. Examples of goods falling under this classification would include specialized chassis components, drawbars, tailgates, or flooring uniquely adapted for agricultural wagons and carts, as opposed to general-purpose trailers.

Distinguishing this category from its siblings, 8716.90.30.00 covers castors, which are typically smaller, swivel-mounted wheels used for maneuverability on lighter equipment, and are explicitly excluded from heading 8302, which deals with hardware. The "Other" category at 8716.90.50 serves as a residual for any remaining parts of trailers, semi-trailers, or other non-mechanically propelled vehicles not specifically enumerated elsewhere within heading 8716.

Within this category, further subdivisions exist to classify specific types of parts. The subcategories of 8716.90.10.10 for "Road wheels" and 8716.90.10.20 for "Wheel and tire assemblies" differentiate between the wheel itself and the complete wheel and tire unit. The residual 8716.90.10.90 encompasses all other parts of farm wagons and carts that do not fit into these more specific sub-classifications.