**Motorized special vehicles** are not required to carry a spare wheel. This is because the regulations and recommendations regarding vehicle safety and maintenance equipment, such as spare wheels, are primarily aimed at **passenger cars and goods-carrying vehicles**. These vehicles must carry a spare wheel to ensure safety in case of a puncture or tire damage during a trip.

On the other hand, special vehicles, which may include agricultural or construction machinery, have different characteristics and needs. These vehicles often have **specific dimensions and weights** that exclude them from certain regulations applicable to conventional vehicles. Additionally, their use and operating conditions do not always require the same type of emergency equipment as passenger cars or trucks.

In summary, although it is important for all vehicles to keep their tires in good condition, special vehicles are not required to carry a spare wheel due to their particular characteristics and the regulations that govern them.