3 ms·TFA says they can only go up to 15 mph.by astura 8y agoTFA says they can only go up to 15 mph.gonzo 8y agoTFA says they’ll do 25 mph downhill, actually.CydeWeys 8y agoAnything with wheels will go pretty damn fast on a steep downhill. Skateboards too. Not many people are riding them this fast because it feels terrifying.