cargo electric bicycles do not know when riding gear in the first few paragraphs?

Has now shifting to the digital display, digital display can just look at the latest products as well as using a computer LCD's FLIGHT DECK electronic display systems. The display system electric trike bicycles can also display 17 kinds of function time, average speed, total distance riding. the cargo electric bicycles and outer gear before shifting to know them, it is necessary to know the concept of the internal gear and the external gear. Simply put outside the transmission gear means electric tandem bike mounted on the outside of the bicycle exists as a separate part, and the inner gear is hidden in the rear hub represents the concealed parts. Presented directly outside the outer gear, direct contact with the external space. However, due to exposure and rain, dirt, oil, etc., so care must be regularly cleaned, and do not in the periodic maintenance of the shift, but the shift in the design due to the limited space, so the more limited range of the transmission, is typically used in urban the riding light trucks as much. Why is the speed the car has yet to spread? Domestic market because consumers have not been able to appreciate the charm of the speed, so at this stage has not been widespread, but in Japan and Western countries shift is already very common (50% in the Japanese bikes are shifting car). Of course, the reason is that no maintenance. Recent new products as well as sensors and micro-motors through the computer to automatically shift the automatic transmission system.