Mountain bike Pei Lin (bearing) and the difference between the ball drums where?

The difference between the bearing hub and the ball hub of the mountain bike

the hub with 4 bearings
Many bike enthusiasts are not familiar with the hub, which is one of the bike accessories. In fact, the hub plays a key role in the performance of the complete bike. Hubs are mainly divided into bearing hubs and ball hubs. Then what’s the difference between the bearing hub and the ball hub of the mountain bike? Now TTGO Bicycles will offer everybody a detailed explanation.
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The ball hub consists of the cup，axle-crosspiece and closely spaced balls (there is a gap for moving in the middle). The hub body and they constitute a big bearing. The ball bearing of the same size can hold more balls because it is unlike the industrial bearing that needs to use the cage among the balls. And each ball’s contact area is larger and can bear more pressure.
The number of the bearing hub’s balls which are in the middle of the bearing is less than that of the ball hub. And the cage is required to keep the distance of each ball inside the bearing. There are seal rings on both sides as well.

It means that the lubricity of the bearing hub is slightly worse than the ball hub. The cage will perish if it is used for such a long time. Both the uneven distribution of balls and the chips’ falling into the cage will greatly affect the lubricity. However, there are more balls in the ball hub so it will not perish and wear quickly in the same condition. And there won’t be chips due to the lack of the cage.
The bearing of the bearing hub is pressed in so it is hard to dismantle it without specific tools when you are installing and dismantling it. Improper dismantling ways will damage the hub and even make it work improperly so it is not easy to maintain it.

The structure of ball hubs is relatively easier than that of bearing hubs. Usually speaking, only two wrenches and one sleeve can help you finish dismantling them.  It is easy to maintain them.

But ball hubs have a deadly weakness: only two ball structures can be hold in one hub (there will be one on each side). However, bearing hubs can hold two (hubs with two bearings) or four (hubs with four bearings) or even more. Once a new bearing is added, the average pressure of each bearing will be reduced, the press resistance be strengthened, the damage to the axle center be lowered, and the axle center will not bent easily.

Multiple-bearing hubs (which have 2 bearings and above) are usually used in mountain bikes with huge cross-country extent or high longitudinal pressure, such as all-terrain, downhill, cycling down cliffs, etc.