Yeah when stock size is enough to stop the car within a limited distance.
There's a complex calcutions after which size is decided. Like top speed, deacceleration, roads, weight of the car etc etc. We live in Pakistan here no one gives a damn to speed limit. And the speed limit of the road is also calculated. If the limit is 50km/h people drives on 100km/h here stock wheels grip are not sufficient. And remember! 2 second distance there's no concept of that in Pakistan .