Brief Analysis of Bicycle Axle and Five-way Specifications
With the continuous development of bicycles, a variety of axle standards have emerged on bicycles, which has dazzled many riders. Recently, I have also met some riders who are familiar with axle standards. So today, I will carefully sort out the axle standards of bicycles and their mutual compatibility.
First of all, one thing we must know is that the dental disc is installed in the five-way of the frame (what is a five-way? The five-way is the very narrow tube perpendicular to the plane where the dental disc is located). The central axis acts as a conversion interface, allowing the frame and the dental disc to transfer our energy in the way we expect. Therefore, the central axis is not only about the dental disc, but also about the frame.
First of all, the five links mentioned in this article are relatively common five-way, special specifications, please check the relevant information by the owner.
Then I will add the basic knowledge of Qfactor, Qfactor, referred to as QF, domestic players call it Q value, this value is the distance between the outer edges of the left and right crank of the tooth plate. In the game, a smaller Qfactor can help the player's force, as well as reduce the upwind area and reduce the wind resistance to a certain extent.
Then let's talk about the standard of the five-way on the frame:
thread British standard BSA, which is one of the most traditional five-way standards. Its thread characteristics are one positive and one negative, the left is a positive thread, the right is a reverse thread, the left is a clockwise screw, and the right is a counter-clockwise screw. The outer diameter of the thread is 34.798mm, and the tooth pitch is 1.37 * 24TPI. This kind of five-way specification is most common on our road and mountain bike frames, and the width of the five-way is mostly 68 and 73mm (this kind of five-way width will be longer on the DH car type, but this article will not discuss it for the time being). If you want to know your five-way width, the easiest way is to take a ruler to measure, this is very simple, ordinary ruler can be.
The same should be true for bicycle traffic
The Shanghai New Town Cycling Race kicks off in September, w
Judging by the physical conditions of the corridor, the flow
The New Town Cycling Race ended successfully, making it a to