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Under-strength frame and swingarm for the power and use case. Repurposed mountain bike parts being pushed way past their design point squirming and flexing under stress. Lots of these bikes are known for throwing chains and eating sprockets because of the excess swingarm flex taking the sprockets completely out of alignment for example.
One of my first reactions when riding a Surron that had been uncorked. I rode it and said no thanks. Going way too fast for mountain bike wheels and brakes. Never really pushed one in any kind of off road environment but I can imagine there might be some flexing going on. Oddly enough the long time manufacturers of dirt bikes have figured out a thing or two about the needed strength of their chassis, wheels, brakes etc. while trying to make them lighter at the same time. One of the reasons the Varg intrigues me as the chassis of that bike looks like a "real" dirt bike. Bonnells are also intriguing for similar reasons. More electric dirt bike than electric mountain bike.
So, Livewire has bought out Dust? https://www.livewire.com/the-pulse/l...t-moto-company