How do you shift your bike?

In general, a bicycle is shifted by a device called a derailleur, which is very similar to the gearshift in a car. In the structure of a bicycle, we call the shaft that connects the two pedals (footpegs) the main shaft. A non-gear shifting bicycle is a bicycle that uses the rotational speed of the main axle to manually change the speed of the bicycle to travel on various roads. The axle that connects the rear wheel to the frame is called the driven axle. By the way, here is the basic principle of bicycle operation: the main shaft rotates through the chain and the driven shaft rotates together, which means that the rear wheel is driven forward by pedaling. The gearbox is designed to change the transmission ratio between the main shaft and the driven shaft, so as to achieve the purpose of saving energy and saving the bike. Generally speaking, the gearbox of a bicycle is installed on the main shaft with 3-5 big gears, which are arranged in a row from small to big. On the driven shaft, 6-9 gears are installed, arranged from large to small. On your handlebar or bike, there are two gearshifts, one for the main axle and one for the driven axle. When shifting, turn the corresponding shifter to move the chain to a different cog. The principle is: there is a device called front derailleur on the chain near the main axle, when we turn the shifter, the position of the front derailleur will change, so that the chain will go to different front cogs, then we turn the shifter of the slave axle, and that's it. In other words, both the master and slave shafts are designed to be changeable, thus creating different ratios to achieve the purpose of speed change. Said so much, to summarize: rely on a mechanical device in a transmission process from one gear to another gear, to achieve variable speed, change is the operating speed or traction Speaking of the application of the transmission, simply change the chain ratio is not necessarily good, we need to understand that different sections of the road require different ratios. When the largest gear is selected for the main shaft and the smallest gear for the driven shaft, the maximum speed can be obtained, but it is the most laborious, so it is recommended to use it on the downhill. When the smallest gear is selected for the main shaft and the largest gear is selected for the driven shaft, the minimum speed can be obtained but it is very labor-intensive, which is especially effective for uphill use. In addition, when the front gear is fixed, the smaller the gear on the driven shaft, the more it accelerates. Nowadays, the world's best manufacturer of transmissions is SHIMANO, which seems to be a company based in the Netherlands. The company produces a wide range of transmissions. In this year's Tour de France, the SHIMANO team ranked 4th in the team standings.