Some riders put forward the question of "the difference between internal speed and external speed change." This is what I want to know, so I searched the Internet madly, not to mention it.
(1) There are three stalls available for Shimano within the three speeds: Light, Flat, and Fast (27% ↠standard → 36% faster), especially for older people, women, students, and some poor physical conditions People use. Because of the use of the inner three speeds, especially on the uphill, on the bridge, against the wind, the load will feel very relaxed and comfortable while reducing physical exertion. It can be said that enjoying the ease of the city is the biggest advantage of the three-speed Shimano.
(b) General external transmissions are exposed to the outside world and are prone to rust and breakage. However, the internal three speeds can be avoided. The entire speed change process is completed once inside the hub, so under normal circumstances, maintenance-free is another significant advantage of the internal three speeds.
(c) The internal three speeds are used as the internal transmission system. The main gears of the transmission are concealed inside the hub and protected by multiple layers of special sealing materials. Therefore, rain, dust, grease, and the like cannot be accessed, so regular maintenance is not required and maintenance-free advantages are realized.
(4) The inner three-speed hub hub's internal transmission mechanism is complex, and it is not easy for technicians to repair it. Therefore, do not add any anti-rust oil at will because it uses the Shimano company's mineral oil.
(5) The domestic internal three-speed model SG-3S88 is a new product developed by Shimano after several years of meticulous efforts and selecting a large number of tests conducted in different environmental cities. Some of the test cities are: Heilongjiang (Frigid Cold), Inner Mongolia Plateau (plateau topography), Shijiazhuang, Xi'an (multiple sandstorms), and Chongqing (Wudu).
(6) Right-angled lever As part of the transmission system, it is made of special resin instead of ordinary plastics. The hardness and strength are quite high. Usually about 80 kilograms is not easily damaged.
(7) The Shimano three-speed device has been in existence for nearly 10 years since it was born. As consumers in China have not yet realized the charm of the internal three-speed, it is not universal at this stage, but it is three-speed in Japan and Western European countries. It is already very common (in Japan, 50% of bicycles are internal vehicles). Of course, the biggest reason is that there is no maintenance. Perhaps within a few years, the three speeds will be very common in China.
Data Supplement (Difference between internal speed change and external speed change)
Before understanding the difference between them, it is necessary to know the concepts of internal and external gears. Simple shifting means that the transmission is mounted on the outside of the bicycle as a separate part. The inner shift refers to the hidden parts hidden in the rear hub. The external gear shift is directly exposed on the outside and directly contacts the external space. The internal transmission is hidden inside and does not directly contact the external space. In this way, due to the large space for design and the large shift range, the external gears are mostly used in mountain bikes. However, due to exposure to external rain, dirt, oil, etc. Therefore, it must be regularly cleaned and maintained. The internal transmission does not require regular maintenance, but the internal transmission has limited space for design. Therefore, the range of variable speed is relatively limited, and it is generally used for light-duty vehicles that ride in cities.
As we all know, the best way to park in the shortest time is to brake the brakes so that the rear wheels just float off the ground. Because of inertia in the process, plus gravity, these two forces work together to form a downward force. The braking action is based on the friction between the tire and the ground to resist this force. The greater the pressure, the greater the friction. Of course, in the soft and slippery road, we must make full use of the role of the rear brake, but on a dry road, the front brake can always provide the maximum braking effect.
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