The rear hub of the bike should always bein good condition, because it determines the smoothness of the two-wheeled transport. According to many cyclists, the ride quality of a bike depends mostly on the type and mechanical parameters of the frame. However, in practice, the determining factor here is the condition of the chassis - bushings, carriages, chains, and other systems.
According to compatibility with various types of brake systems, there are several separate types of rear bushings:
Of course, more complex rear sleevebike, designed to connect to the disc brake system, can easily be used when assembling a wheel with rim brakes, but not the other way round.
The rear hub of the bike includes the following structural elements:
This component of the design of the rear sleeveacts as a tie shell for other functional mechanisms. The main requirement for the body is a high stiffness indicator, since the sleeve is subject to substantial torsional stresses while driving.
The rear wheel hub of a bicycle can be protected by a housing made by stamping or casting. The most reliable high-strength shells are produced by the first method.
They are specific ring rings.the protrusions that are contained on the body of the rear sleeve. This element serves to connect with the spokes of the wheel. The flanges contain special holes where the spokes are inserted when typing.
The main requirement for flanges is highstrength indicator. Based on the insignificant size of the part, it is enough to imagine how much the increased loads fall on its share. After all, a third of the bicycle design together with the cyclist is located exactly above the area of the rear flanges.
The rear hub of the bike mustto be equipped with bearings with a mud sheath. Only in this case it will be possible to forget about their maintenance and replacement, having rolled a bike of more than 10,000 km. Frankly poor-quality bearings will make you suffer unpleasant sounds and suffer from wheel play after the first trip in rainy weather, not to mention the winter. Reliable dirt protection is represented by various seals, which prevent the contact of lubricant with the external environment.
Currently, bulk and secretePromo bearings for rear bushings. The difference is that to eliminate the backlash in the wheel, you can perform the usual adjustment of bulk bearings. In the presence of a similar problem in the case of industrial bearings, most likely, they will have to be replaced. Therefore, the rear wheel hub of the bicycle should be selected, based on the type and reliability of the bearings.
The main parameter of the rear hub axis isits length. To choose a sleeve according to the axle length indicator, it suffices to measure the distance between the opposing outer nuts on the respective bicycle frame anchorages.
After examining the internal and external device backbushings of the bicycle, it is recommended to pay attention to a wide range of standard sizes of this system. The presence of some differences in the parameters due to the use of sleeves on different types of bikes:
The device of the rear hub of a mountain bike has some differences from the designs of the running gear for bikes of the highway category.
Bushings road and highway models of bicycleshave seals - special seals designed to protect the bearings from the ingress of dirt. Often, the seals are combined into a single unit with conical elements.
The rear hub of the stealth bike, as well asother common models of mountain and off-road bikes, in addition to the glands connected to the cones, often have rubber anthers. The presence of such elements helps to increase the protection of the undercarriage against dirt, all kinds of debris and dust.
Unlike the highway bike category, mountainmodels are designed to drive on the most impassable terrain. Naturally, the use of additional protection of the rear hub mechanism proportionally leads to an increase in the weight of two-wheeled transport and a decrease in ease of travel. That is why the assembly of the rear hub of the highway class bike is made by most manufacturers without installing these elements.
We should also consider the design features of bicycles with disc brakes. Mechanisms are used here, the flanges of which are connected to brake discs.
Отличия присутствуют также в способах соединения ratchet on the sleeve with cassette mounts. Most of the popular models of domestic-made bikes contain sleeves with built-in rattles. On the contrary, the rear hub of a high-speed bicycle usually has a rolled-up type of ratchet.
Mostly rear hubsthey are distinguished by an asymmetrical design, since on the right side of the mechanism there must be a cassette or a rear sprocket. Compared to the left, the right flange is closer to the center of the axis. As a result, the needles on the right side are somewhat shorter.
There is a special type of planetary bushings.The internal design of such products contains a mechanism for shifting gears. Installed on such systems, only one star. The bushings of this plan can be operated without installing a chain tensioner.
Starting to build the mechanism, you need to consider thatThe fact that the left and right ends of the axis have some differences. The right cone is tightly connected to the axle, additionally strengthened with a lock nut and therefore never dismantled. The adjustment of the system is made by changing the position of the left cone.
Trying to figure out how to assemble the rear hubbicycle, the main thing - do not confuse the side with which the axis should be installed with the right cone. Making a mistake here is much easier than in the case of front-wheel assembly, where both sides of the mechanism look identical.
To avoid trouble, connecting the elements of the rear sleeve into a single unit during installation, will allow the following sequence of actions:
On this rear hub is considered almostcollected. The only point is the installation of rubber anthers. However, it is advisable to do this only after the final adjustment of the suspension system.
As practice shows, the mostA common and typical back sleeve failure is excessive tightening or loosening of the cone. In the latter case, you will have to endure a noticeable backlash play. On the contrary, hauling cone mechanism will lead to a more tight, difficult course of a two-wheeled vehicle. In addition, there may be a crunch in the bearings.
What to do when the cause of the backlashis the frustrated rear hub of the bike? Repair in this case will consist in tightening the cones with special wrenches. For this purpose, spanner wrenches for 15 and 20 mm are used, with the help of which the lock nuts are unscrewed first, and then the cone is clamped or loosened to the desired limit.
В идеале эффект люфта при движении велосипеда must be completely absent. If the taper mechanisms of the rear hub were set up correctly, the wheel will rotate easily without an additional impulse, only under the influence of the force of attraction on the reflectors.
Often the cause of breakage becomes flexion.bushings. This most often happens when low-quality, low-cost parts are used. If this happens, only the complete replacement of the axis with a new, more reliable one will solve the problem.
To carry out repairs or scheduled maintenancemaintenance of the rear wheel hub was more convenient, it is recommended to dismantle the ratchet in advance. However, when the whole essence of the repair lies in the usual tightening or loosening of the cones, it is not necessary to resort to such an action.
Ultimately, to avoid unnecessary problems inin the form of a long idle bike and wasting expensive repairs, it is enough to regularly maintain maintenance. Most often, the essence of maintenance is reduced to the reassembly of mechanisms, their cleaning, lubrication and installation in reverse order.
