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SEM looks to bring monster 4,000-watt dual-drive e-mountainbike to US
With its massive grunt and interesting double drive system, it would be an absolute brute on the trails.
Named the "Moto-Bike" – and it might as well be a small dirtbike – this thing uses a strong aluminum e-mtb frame with an integrated 4-kW motor and a big ol' 52-V, 17.5-Ah battery capable of storing around 910 watt-hours of energy.
On the right side of the bike, there's a standard 11-speed mountain bike gearset. On the left side, there's a belt drive straight back from the motor to the back wheel, thus neatly avoiding the tendency powerful mid-drive e-bikes can have of chewing out your chains and sprockets, at the cost of a little extra complexity. Personally I think it's a great idea, even if it means the motor no longer runs through the gears.