Those are great. Many years ago I helped a friend stud a set of Cooper Weather-Master tires 560-13 for his Datsun 510 rally car. A long hard job, but boy did they ever stick.
[ame="https://www.youtube.com/watch?v=DN9zo8z7g80"]WRC Rally Sweden 2015: Tech Special - YouTube[/ame]
Here's a bizarre stat from Michelin. "Collectively, the 460,800 studs available for Rally Sweden weigh almost 2 tonnes and measure 1km laid end to end!"
This is about more than just tires but it fits here. [ame="https://www.youtube.com/watch?v=uXnAUqHHq2k"]WRC - RallyRACC 2017: Tech Special (gravel vs. tarmac) - YouTube[/ame]