What Is A Hub?

 How is it classified?
The hub, commonly known as the "hub barrel", is the barrel outside the shaft that connects the spokes, usually called the shaft skin. According to the different arrangement methods of the number of articles, there are generally man3 and man5 compilation methods. There are two types of hubs: iron hubs and aluminum hubs.
The hub system of a bicycle includes shafts, bearings, hubs, etc.
Flower hubs have iron hubs and aluminum hubs, iron hubs are bicycle hubs that are generally ridden at home, and aluminum hubs are generally more high-end hubs, as mountain bikes, performance bikes, road bikes and other types of hubs.
There are two common types of rim emptying, 32h and 36h, that is, the number of spokes. The arrangement of spokes generally has the editing method of manga 3 and manga 5 according to the number of strips.
Flower hub classification
According to the type of bearing (bead block type, cultivation type):
The bead hub is a bearing structure that uses loose beads into the inside of the hub and supported by a shaft stopper, and the famous brand that currently uses the bead hub is Shimano in Japan. The advantage of the bead hub is that it has good support for forces from all directions, and the disadvantage is that the maintenance is slightly cumbersome.
Peilin hub and hub using integrated industrial bearing, currently used by most brands, bearing hub longitudinal force is more reliable, maintenance is relatively convenient.
By opening width:
The opening width is the frame and fork opening size that can be supported by the shaft core length of the hub, generally speaking, the front hub opening is 100mm; The rear hub opening gear of road car / field car is different according to the model, generally between 120-130mm; The rear hub of the mountain bike opens between 135-150mm.