What's the maximum displacement of the engine of a motorcycle that you can ride holding an A1-category driving licence?

In accordance with the regulations of the Act on Vehicle Drivers, a category A1 driving licence entitles the holder to ride a motorcycle with an engine capacity not exceeding 125 cm³. This Act also specifies additional conditions, such as an engine power of up to 11 kW and a power-to-weight ratio of up to 0.1 kW/kg. Therefore, 125 cm³ is the maximum engine capacity permitted by law for this licence category.