Batteries and controllers upgrades are all the rage because they allow to transform the Sur Ron into a rocket. With a good controller and a proper battery, you can tune the power however you want. I opted for the ASI BAC 4000 and settled on 13kW. At this power level and with a well programmed controller, the bike plays in the big league. It definitely compares to big petrol bikes in terms of power and acceleration, while keeping astonishingly manageable and nimble.
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