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That's an expensive wheel!

I rode an early version, it's pretty fantastic.

That looks absolutely amazing! The large wheel makes it a lot more usable imo.

But what's plan b when something goes wrong? On the electric skateboards you can at least break in the good old fashion way.

People have been riding skateboards/longboards without brakes for many years now. Plan "B" is often a good set of pads.