I believe that many riders will be impressed by such a scene: when a tire blows out and replaces a spare tire, they are afraid that the bolts will not be tightened tightly, and they will step on them with their feet until they can't step on them. So, is this operation really good? It really won't be a problem? In fact, the inner world of the bolt is very complicated.

Ordinary riders will ask, isn’t it just a matter of screwing a nut, is it difficult? Is it too loose? I’m afraid of loosening, so I won’t get into it at all? No, over-driving may cause the bonding surface to collapse, and then , It is loose; it may cause damage to the tooth surface if the head is hit too much, and then it is also loose. Take the following diagram as an example, the tightening torque meets the requirements, but because the tightening process cannot meet the requirements (the torque can be achieved by turning 200°, but this point needs to rotate more angles to achieve the torque), it is judged as unqualified, and it is possible Causes subsequent false torque problems, and the connection fails.