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Alex- That means there is no gears in the middle either, which simplifies the assembly, decreases amount of parts, increases efficiency, decreases heat produced, etc.
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But with an efficient gearbox a smaller motor can accelerate and maintain speed more efficiently. A 100cc and a 1000cc motorbike can both do 60Mph but the 100cc can do it far more efficiently 120+Mpg vs. 50 to 75. (My 1970Yamaha LS2 vs the average locally advertised fuel economy for bikes in excess of one litre displacement)
As far as heat production from my experience the less load an electric motor sees during operation the cooler they run...thus by reducing startup and operational load with proper gearing you increase efficiency by reducing heat production in the motor... of course the best gearing for getting moving will not be the best for cruising at highway speeds so more than one ratio is necessary...But there is an upside more gears allows for more RPM's during deceleration...more RPM equals more power produced and better engine braking. The ideal design would probably be based on the variable belt drive systems found on scooters, quads and snowmobiles..with the main difference being that the belt is never alowed to disengage from the motor pulley or from the pulley that drives the wheels (never allowed to free-wheel)...matched properly to the weight of the vehicle and the output characteristics of the motor this would likely lend the best economy of motion.
