If the type approval/car sticker lists more than one dimension than the load and speed index must be at least the one given for a particular dimension.

Art. 58 VTS https://www.admin.ch/opc/de/classifi...index.html#a58

Except for winter tires where you can as low as 160 km/h (Q). But no exception with put further exception: In Italy during the summer months the speed index a winter tire must be at least the one given in the type approval/car sticker.
Art. 59 VTS https://www.admin.ch/opc/de/classifi...index.html#a58 and some dirctive or circulary from the Italien tranport ministry, http://www.pneumaticisottocontrollo....gory.php?id=15

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