"E-Bike" is a very popular combination of words in recent years, derived from "electric-bicycle", that is, a Bicycle with Electric power assistance, commonly known as electric assisted bicycle. Different countries have different rated power and speed limits for electric road bikes. According to the European Union standard, the rated power of the motor shall not exceed 250 W, and the maximum running speed of 25 km/h, the power will automatically shut down.
At present, electric road bikes can be divided into two types: middle motor and front/rear motor, with their own advantages in performance and technology. So what's the difference?
Front/rear electric power assisted bicycles are mostly hub motors.
The advantages are compact structure, many models to choose from, relatively cheap entry model, some models can be pure electric driving,electric road bikes with rear motors have a strong sense of pushing back when driving.
Rear-mounted electrically powered bicycle
Depending on the wheel size, the hub motor may be mounted in a higher position or at the same height as the mid-mounted motor. Although the center of gravity is similar in height, the front or rear hub will move the center of gravity forward or back.
Secondly, electric road bikes should be in the motor does not work, still can achieve normal riding through manpower, the use of front/rear electric road bikes in human riding to overcome the reluctance of the hub motor.
Central electric power assisted bicycle
In contrast to front-mounted or rear-mounted e-assisted bicycles, the motor of a mid-mounted E-assisted bicycle is located in the lower middle of the frame. Because the weight is near the center of gravity of the bicycle, the balance of the vehicle is relatively small, the relative resistance of human riding is small, and the motor can be regulated by mechanical transmission. The middle motor control sense is good, and the torque is very large, the acceleration is very fast. When the vehicle is running fast, it can play the role of front and back balance. This also makes the mid-mounted electromechanical powered bicycle can adapt to more road conditions.
More adwanced technology in the middle motor, it is the combination mechanism of internal variable speed gears, a number of clutch gears in the motor housing to form a variable speed ratchet, so that its output torque is increased, load and climbing power is higher. And its torque sensing is also more sensitive, sensing the change of stampede force of the crank, will directly act on the central axis, and accelerate more quickly.
Without changing the basic transmission and transmission structure of the bike as a whole, the rider can also cooperate with the original mechanical rear transmission mechanism of the vehicle, and the central power assist to achieve higher cycling efficiency. And, in the motor of all sensors are integrated in the box, only a wire sticking, connected to the handlebars controller, and even within the battery connection is line contact is concealed, the streamlined integrated design, in the rear motor car maintenance more convenient, more concise appearance and users to use more convenient, also make motor of dustproof, waterproof performance is stronger, The failure rate is lower. But relatively, the power of the middle motor bicycle price is also higher.