Still with a knife, but carefully. These labels really just mean ‘don’t come whining to us if you act like an orangutan and stab a knife through the box into the item inside’.

Yes, while they look interesting there are reasons why saw blade lookalike wheels aren’t commonly used. I hate to think of how the weight of those dirt bike ones would affect the handling (probably not so much of a problem over smooth ice, but rougher terrain would be a challenge).

There is indeed a video of this.

There’s also a video of someone trying a similar setup with a dirt bike, though those guys didn’t reverse the front teeth (did still steer ok, not sure how well it’d brake).