One thing that I never understood about electric bike conversions... Why do people keep using big motors (in this case dual motors) instead of a gearbox?
In the fifties all bikes had the engine and gearbox separate, with a short, heavyduty chain between... Get one of those, bolt it to the right place in the frame and use a single one of those motors... With three or four gears available that single motor should be enough for some serious speed and strong enough for burnouts in first gear if you like... And while a screaming 4 pot ICE from a newer bike would rip that gearbox apart, I'm fairly sure it will handle that power without flinching...
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