On which document does a manufacturer state the minimum speed index of tires for a vehicle? There is a table with tire sizes and recommended tire pressure on the one hand on the other hand a specified maximum speed. In Belgium it is required that the tires are at least suitable for the maximum speed of the vehicle specified by the manufacturer.
Unfortunately, rules are rarely logical, because although a 204hp California has a maximum speed of more than 190km/h, there is no road in Belgium where it is allowed to drive faster than 120km/h.
Some rules only apply to residents of a country, others also apply to visitors from other countries.. it drives you crazy sometimes.
Some rules are stupid: you can't have a spare bulb with you if you have LED headlights for example. But that is perhaps better a topic for another thread.