How to remove the bearing from the rear wheel of a bicycle

Types and causes of malfunctions

Usually, all parts do not break instantly, this process occurs gradually, which gives a chance to react to a breakdown in time. If extraneous sounds began to appear during operation, this can only mean that some part will soon fail. Some of the breakdowns with their sound can shock not only a novice car enthusiast, but also an experienced driver. For example, a defective wheel bearing howls with such force that associations with the hum of an aircraft turbine come to mind.

By the way, problems in the hub can bring quite a lot of trouble, this is one of those types of breakdowns that directly affect driving safety. If the bearing splits on the move, this will instantly lead to a wheel jam, which, of course, will entail very serious consequences in the form of a car accident. Especially if all this happened at high speeds.

Long before the breakdown, the wheel bearing begins to remind of its existence. There are basically two options for his behavior: he will buzz or he will slightly tap. During maneuvers, the knocking or the hum changes or stops altogether, but when moving straight ahead, the sound resumes. Some motorists confuse the rumble of a broken bearing with the hum of winter studded tires. Indeed, at the initial stage of a breakdown, it is quite difficult to distinguish that this is a bearing malfunction.

As the wear of the wheel bearing increases, the vibration that occurs as a result of its operation through the body of the car will be given to the feet of the passengers or the driver. This will depend on which side the defective part is on. But if the repair process is delayed and nothing is done, the noise and vibrations will be so strong that it will be almost impossible to determine the malfunction by ear.

Troubleshooting and repair

It is not difficult to diagnose a breakdown. All you need to do is lift the vehicle wheel being checked with a jack, or lift the entire vehicle with a hoist. Grasp the top and bottom of the wheel with your hands, trying to swing it in different directions. Provided that the bearing is already defective, the wheel will begin to swing without visible effort. If such a malfunction is present, repair the rear wheel hub as soon as possible.

Based on the configuration of the car, the way out of the situation may be to replace the bearing of the rear wheel hub or the entire unit together with the hub. When carrying out repairs, you should carefully inspect everything, and if a development is found, it is necessary to replace the rear wheel hub with a new one, thereby protecting yourself from the fact that this situation will repeat itself in the near future. Bearings do not have a specific life, but in practice the average life of a wheel bearing is about 100,000 kilometers.

If an extraneous sound appears during movement, but the wheel does not swing back and forth, you can try to simply rotate it with your hand. With a properly functioning bearing, the wheel will spin soundlessly. A faulty bearing will make a noise, as if balls are rolling and rubbing inside it. The degree, as well as the strength of the noise, indicates the severity and degree of wear. You can also spin a wheel with a good bearing for comparison.

How to identify faults and repair the rear wheel hub

Due to the regular and constant use of the car, most of the parts often break down over time. The suspension is considered the most vulnerable point of the car, because it takes over, smoothing out for the driver, all the irregularities, and sometimes the absence of our roads. One has only to get into a hole, run into a curb, and sometimes just pull over to the side of the road. sooner or later this will result in a breakdown of any part of the car’s suspension.

Removing the hub from the rear wheel

How to remove the rear wheel hub for vehicles of various modifications:

  • It is necessary to remove the protective cap from the hub.
  • On the side of the hub nut, straighten the jammed edge with a chisel.
  • Loosen the hub nut slightly. It takes quite a lot of effort, so it’s better to do this with an assistant who will put pressure on the brake in the cabin.
  • Then you need to jack up and remove the wheel.
  • Next, you need to remove the brake drum, on which we have the rear wheel hub bolt.
  • Then unscrew the nut to the end and pull out the washer under it.
  • It is necessary to install a special puller and then remove the hub.

Here is, in fact, a brief instruction on how to remove the rear wheel hub on cars.

The main thing is to remember that a wheel bearing failure is far from a joke and with this malfunction the operation of a vehicle is prohibited. It is better to have your car repaired on time than to spend money on restoring it later. What do you think about this? Was this material helpful to you?

Removing and installing a star on cassettes

Unlike ratchets, in this system the stars can be changed individually. All that is needed is to remove the old part and put a new one in its place. Special rivets and small spacers are located between the stars, which allow them to hold a fixed position and facilitate the installation of the cassette itself. It is very easy to screw the desired star from the device, the main thing is not to get confused in the sequence, especially on large cassettes of high-speed mountain bikes.

Sometimes “spiders” can be found on cassettes. rigidly fixed areas of several stars. Here you will have to replace the entire set, on which one of the stars is badly worn out. True, this only applies to large transmission rear wheel sprockets.

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When replacing a single chainring, you may encounter the problem of the difficulty of switching the chain to it. This is due to the fact that the chain already has wear compared to a new sprocket. And if this is not so noticeable with one detail, then several new stars will immediately bring a tangible dissonance to the operation of the transmission. That is why it is advisable to change the cassette at the same time as the chain.

Dismantling the transmission cassette

The rear of the transmission is not too difficult to disassemble, all that is needed is time and a few tools: a cassette puller, a whip and wrenches (open-end. for removing a wheel and an adjustable. for a cassette).

The first thing to do is to free the bike from the rear wheel. Using a wrench, the nuts are unscrewed, and the chain is dropped from the rear sprockets. On a mountain bike, it is usually a matter of a second to remove and put on the wheel, thanks to the eccentric fastening.

The removable device is installed on the slotted nut of the cassette. A whip. a small flat “knife” with a fragment of a chain. is needed to keep the cassette from turning. With the help of an adjustable wrench, we rotate the puller, we direct the whip in the opposite direction, or, more simply, we hold it with a large star of the system.

remove, bearing, rear, wheel, bicycle

To unscrew the nut, you will need to sweat a little, and not only in the first stage. With the same good effort, the stars will need to be returned to their place. Once the nut has folded, the cassette can be safely unhooked from the wheel. Now it remains to examine it and determine which star needs to be pulled out.

Some of the outer small sprockets can be removed immediately when removing the cassette. They should be cleaned and inspected for wear. The same is done with the main sprockets: it is determined how much they are worn out and which ones are the most.

How to remove rear sprockets from a bike

The bike drivetrain requires periodic maintenance. The most common problems are chain wear and failure of one or more sprockets on the cassette. Wear is also true for a single-speed one, the only difference is that the chain and the star itself are designed for longer operation.

How To Replace Bike Wheel Hub Bearings

The worn out part of the transmission negatively affects its entire operation, so the used sprocket will need to be replaced. Especially this problem pops up on asterisks that are used too often, which, in principle, is logical. Before changing, it is necessary to remove the worn-out sprocket from the rear wheel, which we will talk about further.

A little about singlespeed

To remove the rear transmission sprocket from a single speed bike, you only need to open the retaining ring. Among singspeed lovers, you can hear that the regular ring is useless and can break itself, even if you did not think about changing the star. Perhaps this is so. In any case, if the stopper is damaged, we change it to a new one, otherwise backlash cannot be avoided (the chain simply dangles from side to side).

It is also very simple to assemble such a structure: the ring is literally put on its own, you don’t even need to squeeze it. It’s that simple on single-speed bikes! You shouldn’t just wedge yourself into the transmission of a bicycle with one gear. Common reasons are a badly worn part or the need to install a new sprocket with a larger diameter.

As you know, without serviceable stars and a chain, a great will not even be able to get under way. Timely replacement of transmission system components is the most important component of any type of bike repair. from simple two-wheeled road bugs to road and mountain superbikes.

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Bushing body

Typically, the hub body is the wheel hub. It has flanges on which the spokes are attached, and due to the presence of a set of sprockets on the rear wheel, the spokes have a slightly shorter length on one side. In bushings with loose bearings, the inner surface has tracks along which the balls move.

Bicycle hubs vary in material and interior design. They usually consist of an axle, a hub with flanges to which the spokes are attached, and bearings. There are the following types of rear wheel hubs:

  • Ratchet, in which a set of sprockets is combined with a ratchet mechanism into a single whole. Such hubs are often used on bicycles in the lower price segment.
  • Cassette, in which a set of rear sprockets is installed on a special drum using a spline connection.
  • Planetary with an internal gear change, in which the gears are located inside the housing of the hub itself. They are heavy and expensive, but reliable and require little or no maintenance.

The first two types are most widespread, and planetary ones remain rather exotic, although they are often used in city bikes.

Ratchet hubs are cheaper, but less reliable and are considered outdated, so it is better to choose the cassette option.

Main types of bearings

The main differences between parts. by type of structure: rolling and sliding.

The sliding bearings are driven by the process of rotation of two elements relative to each other tangentially. Parts are made from materials with a low coefficient of friction, such as steel alloys, bronze and others. Two bearing parts are in direct contact with each other, so this mechanism is more prone to abrasion, unlike rolling bearings.

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A feature of rolling bearings is the presence of balls (rolling bodies), which are placed between two rings. They are used in such movable bicycle structures as carriage, bushings, steering column. For applications where pressure and abrasion resistance is an important requirement. There are two main types: bulk (separator) and industrial.

The separator is an open mechanism. It is a cage in which the balls are distributed along the groove and fixed with a flare nut. The mechanism is placed directly in the workpiece, for example, in a carriage mill. Advantages of this type: easy removal and installation, which allows you to adjust the mechanism even in the field; the components of the mechanism can be replaced separately. However, the cage bearing requires frequent adjustment and cleaning of the mechanism from clogging.

The industrial one is characterized by a closed mechanism that fits completely into a movable unit. The system provides protection from external influences in the form of dirt, moisture, which significantly extends the service life of the mechanism. Clogging does not get inside an industrial bearing with a closed housing, the lubrication is permanently retained. This mechanism does not need adjustment. If necessary (wear, breakdown), the entire bearing is changed, which is problematic to do in the field. And industrial mechanisms are also distinguished by a higher price.

It is worth noting one more type of bearings, which are made of ceramics or cermets. They are highly resistant to wear and corrosion, temperature changes. These parts can be found in high-end bicycle mechanisms.

Disassembly and maintenance of the rear hub

The rear wheel mechanism of a bicycle requires periodic maintenance and repair, and often inexperienced cyclists have problems disassembling and assembling it. However, this is a fairly simple operation, and after a little practice it becomes more difficult. The main thing is to choose the right tool and be patient. You should also be very careful, otherwise a small part or ball rolling somewhere can cause serious problems, and it will be impossible to assemble the mechanism correctly. If you are not sure of your actions, then you can even record the process on video, so that during reassembly it is clear where to install this or that element.

All conventional bushings are designed to be disassembled from the side opposite to the sprockets, that is, to the left. Consider the sequence of actions when disassembling a product on bulk bearings, since this design is the most common:

  • First you need to unscrew the nuts and disconnect the wheel from the frame. With eccentric clamps, you don’t even need tools. After the wheel is removed, you can start disassembling.
  • Now you need to remove the sprockets, otherwise it will be impossible to get full access to the inside of the bushing. If the wheel has a cassette, then you will need a tool called a whip and a puller. The whip is thrown over the large sprocket and holds it, and the puller is inserted into the cassette and rotated counterclockwise. After dismantling the cassette, you need to remove the brake disc from the left side of the hub (if disc brakes are installed).
  • To disassemble the ratchet wheel, you need a puller and a wrench with good leverage. You have to put in quite a lot of effort, because the ratchet twisted all the time you were cycling. The ratchet also needs to be unscrewed counterclockwise.
  • For further work, you need two keys. A special cone wrench has a small thickness, it holds the bushing cone, and with the second wrench you need to unlock the left nut that fixes this cone. The unlocked nut can be unscrewed, and now the rear axle of the bicycle can be easily removed from the hub, giving access to the bearings and the inner surface of the wheel hub.
  • The balls can be covered with metal anthers. Both must be carefully removed and folded into some kind of box. That’s all, the sleeve is disassembled, now you can start maintenance and repair.

The scheme for disassembling the sleeve on industrial bearings is even simpler, a certain difficulty is only removing the cassettes with balls, since they are pressed quite tightly into the hub. The cartridge will have to be removed with a special tool or knocked out with hammer blows along the axis, but this must be done extremely carefully so as not to damage the flange.

Sometimes you have to disassemble the drum itself, on which the cassette with stars is attached. In this case, a special slotted puller is required. But such a need arises extremely rarely, and in this case it is still better to contact the workshop.

Maintenance of the rear bushings consists of removing old grease, cleaning parts from dirt, checking their integrity and applying new grease. It is necessary to thoroughly rinse not only the bearings and the inner surface of the hub, but also the threads on the nuts and axles, since sand is often packed into it. When twisted, it collects on the surface of the cone, can cause crunching and even damage to the balls. For this, gasoline, thinner or special detergents are usually used. After cleaning, apply grease to all moving parts.

The assembly of the bushing is carried out in the reverse order. If the details are not lost, then everything will go without any difficulty.

When installing a wheel in the dropouts, you should pay attention to one important point: the axle with the hub should fit into them quite tightly. If a gap develops, insert the spacer washers. Otherwise, the feathers will contract and bend when the wheel is locked, which can lead to permanent stresses in the feathers and, ultimately, to the destruction of the structure.

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The need to replace the bearing

The main task of the bearing is to fix and correctly work the unit.

In this case, the bicycle pedals should rotate smoothly.

The carriage very often fails. This is where the pedals and cranks connect. A broken bearing in this assembly will make driving impossible.

Depending on the type of the carriage of the bicycle, the work of the parts may be different.

When the carriage is closed, sand, dirt, water and dust will not get inside. This does not lead to a decrease in the life of the part.

There is an open caret type. The device is complex. All carriage products are inserted into cups. They, in turn, are in a carriage glass. This is all built into the tube of the bicycle frame. This is how the rotation happens.

The specified type of knot is vulnerable during operation, much more than other parts of the bike.

Therefore, the bearing must be changed frequently.

Stealth bike rear wheel device

Bushing body

Typically, the hub body is the wheel hub. It has flanges on which the spokes are attached, and due to the presence of a set of sprockets on the rear wheel, the spokes have a slightly shorter length on one side. In bushings with loose bearings, the inner surface has tracks along which the balls move.

Rear axle

The rear axle of a bicycle is a threaded rod rigidly fixed in dropouts, which does not transmit torque, but at the same time carries the main load when the bicycle is moving. It is usually made of steel, titanium or aluminum alloy and is an integral part of the bushing.

Depending on the type of attachment, the axles can be hollow or solid. The hollow ones are used in conjunction with eccentric braces to facilitate wheel mounting and dismounting. Such axles have greater rigidity and less weight.

Another way to fix the wheel is to fix its axle in the frame stays with special nuts. For a frame with horizontal dropouts, an axle with nuts is more suitable due to a more reliable and durable wheel attachment.

Some mountain bikes and cyclocross bikes use thru axles with a threaded end. These axles are part of the frame design and are usually supplied with it.

The thickness of the rear axle depends on the type of bike, and its length is determined by the distance between the dropouts of the frame stays. In some models of bushings, the diameter can be changed using special adapters. The following axes are usually used (the first number is the diameter, and the second is the length):

  • 10 x 135 mm. used in most modern bicycles;
  • 10 x 130 mm. for road bikes;
  • 12x150mm. bike axles for downhill and free ride;
  • 10 × 170 mm. such axles are placed on fat bikes;
  • 10 x 120mm. Suitable for speed track bike.

On bicycles for extreme sports of the High End level, special axles of increased thickness can be used, which have increased strength.

Bicycle hubs and rear wheel axle

When choosing a bike, many novice cyclists often look at the rear derailleur, frame, the presence or absence of a shock absorber. At the same time, insufficient attention is paid to such an important component as the wheel hub.

Required tools

It may be necessary to dismantle the rear wheel in the following cases:

  • there is damage to the rim;
  • a broken tire or a deflated tube;
  • complete wheel wear.

For disassembly and subsequent assembly of the rear wheel of a bicycle with your own hands, in addition to traditional open-end wrenches, you will also need special tools:

  • a puller for the type of cassette that is installed on a bicycle (for example, the mechanism of cassettes of the Stealth model and KhVZ road vehicles has a completely different design, therefore, suitable types of pullers are needed);
  • whip. a cassette fixing device, consisting of a lever with pieces of a bicycle chain attached to it;
  • a spoke wrench (it is desirable that it has at least three slot sizes, which will allow you to capture even old knitting needles with a knocked-down square of heads);
  • special spoons for tire bead.

Advanced cyclists can use the repair stand to work in a natural pose.

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Renovation work

Before you start disassembling and assembling the rear wheel of a high-speed bike, you need to find a comfortable place to stock up on gloves so as not to get your hands dirty. If there is no relevant experience, you should strictly follow the sequence of actions, take into account all the subtleties. A great help in this matter. training videos.

Broken or bent axis

Another common problem is axle curvature or violation of its integrity, caused by low-quality materials used in their manufacture, or by the design features of the bushing itself. Such breakdowns are mainly characteristic of ratchet bushings, since their support bearings are too far from the axle attachment point in the dropouts of the frame feathers. The result is too large a lever, and when the load increases, the axle becomes unusable.