Other speed index for winter tyres?

Good morning everyone with each other, at the moment I am looking for winter tires for my new car. Here was a tire release, which included only Y-decken (300 km/h -> teaeuueeer)!!! Can I also drive an ordinary V-decken (240 km/h) or is there one directly on the lid? That I can not drive faster than 240 is clear to me and I have never driven that fast! There was/is always this chic sticker for the interior, which is a should remind drivers that you should not exceed a certain speed!? Greetings