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.
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 remove a Shimano Nexus or Alfine hub equipped wheel from your bike
The worn out part of the transmission negatively affects its entire operation, therefore the used sprocket will need to be replaced. Especially this problem pops up on asterisks, which 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.
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.
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 the 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.
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 chains, a great cannot even move. Timely replacement of transmission system components is an essential part of repairing any type of bike. from simple two-wheeled road bugs to road and mountain superbikes.
Change the sprockets on the rear wheel of the bike
The drivetrain plays a very important role in the operation of the entire bike, so you must carefully monitor the wear of individual parts of it. This is especially true for the rear wheel sprockets, which fail over time. A worn out sprocket must be replaced as soon as possible, and it will not be difficult to do this.
Before starting the replacement process, get yourself the tools you need to help you. It:
- Cassette remover
- Rozhkova and adjustable wrenches
First, remove the rear wheel from the bike. This is very easy to do. Unscrew the nut with a wrench and release the chain. Owners of mountain models just need to press on the special mount and the wheel will be dismantled.
Next, we install a removable device on the slotted nut of the cassette. Here we need a whip that will prevent the cassette from turning.
While we rotate the puller with an adjustable wrench, hold the largest star with a whip.
Using a nut, unscrew the cassette and remove it from the wheel. We carefully examine the stars and determine which one has become unusable. Start with the smallest and end with the largest.
The bike drivetrain is designed in such a way that you can only replace the worn out sprockets and not the entire cassette. Therefore, having examined the cassette, you remove the used parts from it and replace them with new ones.
It is very easy to pull the star out of the cassette, this is facilitated by special rivets. The main thing is to carefully remember the order of the stars, so as not to get confused with their installation back. In the configuration of some bikes, you may find so-called spiders.
It is a group of several stars that are inextricably linked. In this case, you will have to replace the entire spider.
Many cyclists are faced with the following problem. After replacing several stars, there is a great discomfort in the operation of the chain.
This is due to the fact that the chain has already passed a certain mileage, has worn out and now it is difficult for it to interact with new parts.
Therefore, experts recommend the simultaneous replacement of the chain and worn sprockets. This greatly minimizes the complexity of your bike’s drivetrain.
If you own a single speed bike, the process of replacing the chainring will be simplified to a minimum. You just need to open the locking ring.
If your own ring has become unusable, it must be replaced immediately, even if you are not going to replace the stars in the near future. Otherwise, the chain will lose its fixation, and this threatens with backlash.
The process of replacing the ring is very simple, you do not need to perform the slightest forceful manipulations. Therefore, if you are talking about a single-speed bike, everything is very easy and understandable here.
However, the owners of such models should carry out the process of dismantling the cassette only if one or more of the largest stars have worn out. If a small asterisk starts to fail, this is not a cause for concern.
Whatever you ride, remember that both the simplest road bike and the super-fast bike need a proper transmission. A badly worn chain and stars will not allow you to drive even a couple of meters. Pay close attention to the mechanics and replace worn-out parts in a timely manner. A working bike is the main guarantee of your safety and a cool, trouble-free ride!
The difference between a ratchet and a cassette
Do not confuse a bicycle ratchet with a cassette, as they are not interchangeable. Currently, the former can only be found on old and very cheap bicycles. On modern bicycles, a more advanced part is used, such as a cassette.
The main drawback of the ratchet is its incompatibility with the 15 mm diameter hollow shaft of the new QR15 standard. Loose loading from off-center sprockets can cause local bending on the hollow axis.
In a ratchet, the smallest sprocket is not smaller than with 14 teeth, and its more modern modification. the cassette. can have even smaller sprockets, with 11 or 12 teeth
On the inner part of the ratchet there are ratchet pawls, on top of which an outer sleeve with sprockets is installed. The role of the nut holding these two parts is played by the cone, which is the working surface for the ball bearing. Inside there are two bulk bearings, each of which is assembled from balls of the same size.
The hidden part of the ratchet. the inner sleeve. is screwed onto the threaded part of the rear wheel, and to remove it, you need a special puller.
Bicycle sprocket cassette replacement tools
The circlip is designed to hold the cassette sprockets on the hub. To remove and replace the cassette, it is necessary to unscrew this retaining ring. To do this, you need three tools: a whip. a short piece of chain with a handle for unscrewing the rear sprockets, a tool to remove the circlip and a large adjustable wrench.
How to install a cassette on a bike
First of all, make sure that the cassette assembly matches the unfolded / removed parts. To facilitate this process, the sprockets have grooves of different sizes (for each sprocket. individual), and the bushing has suitable splines. It is the correct alignment of the grooves and splines that all the sprockets will stand in a certain order.
There are some important things to keep in mind when installing the cassette on your bike:
Removing and installing the cassette is not difficult, because if you have a minimum set of tools and at least basic knowledge of the technical plan, all the work will take a little time, a maximum of 60 minutes.
But even if such a process is to be carried out for the first time, you should not give up. the experience of removing and installing a cassette will certainly come in handy more than once.
The fact is that experienced cyclists recommend carrying out such maintenance of the bicycle cassette at least once a year.
Removing the ratchet (for hubs with a screwed-in ratchet)
On such bushings, the cassette is removed together with the ratchet, therefore, when adjusting the bearings or replacing the spokes, it is not necessary to disassemble the cassette. This only needs to be done to replace the sprockets themselves.
To replace the spokes on the right side of the rear wheel or to change the grease in the bearing, the cassette can be removed with the ratchet without touching the hub axle. The inner surface of such a ratchet has slots into which a corresponding puller must be inserted.
The sprocket block rotates here on the ratchet body. The body itself is screwed onto the bushing and the puller is inserted into the body.
We insert the puller into the slots on the ratchet, and turn it off with an adjustable or open-end wrench.
Unscrewing may require considerable force. We recommend using a gas wrench or a long-handled wrench of 24. The thread at the ratchet is left, unscrewed clockwise (against the freewheel of the ratchet).
Then we remove the cassette together with the ratchet and the protective plastic ring.
If you are going to replace the wheel, leaving the old ratchet, then buy a wheel with a hub just for the ratchet. With such a hub, you will see only the axle without the hub drum.
Removing the ratchet and cassette
The rear sprocket block (cassette) is mounted on a ratchet. Maintenance of the cassette is reduced to cleaning it from dirt that gets between the sprockets.
The device of different cassettes is approximately the same, they differ only in the number of stars (from 5 to 9) and the way they are attached to each other. On many cassettes, the sprockets are simply tightened with screws.
In this case, the most worn sprockets can be replaced with new ones. Sometimes a block of sprockets is made non-separable (sprockets are riveted into a single block).
This increases its strength, but then when some of the sprockets wear out, you will have to change the entire cassette.
There are various ways of attaching the ratchet cassette to the hub. Modern imported bicycles contain rear hubs with wound ratchets. The body of such a sleeve has a thread on the right side, onto which the ratchet is screwed together with the cassette.
If you have 7 or fewer stars, then, most likely, the stars have a ratchet in themselves and to remove them you need a puller to unscrew the entire ratchet as a whole. Actually, there are 7-speed cassettes too, it’s just that a different hub is used for them. with a shorter drum. If the number of stars is 8 or 9, then a cassette hub is usually used and the ratchet is installed on the hub.
Installing the front wheel is the same as removing it, but of course in reverse. And one more nuance. do not confuse where the rotation of the wheel will be directed, since your bike is upside down. Of course, if you have disc brakes, you will not get confused, because the disc must be inserted between the pads.
So let’s start with the front wheel. First, let’s see what kind of brakes you have. If they are rim (v-brake), then they must be unclenched. for this you unclench the pads with both hands and remove the arc. Well, if the brakes are disc, then you can simply proceed according to the scheme. After turning the bike over, we look at how your wheels are fixed. with nuts or an eccentric (a small lever). In the first case, we take two suitable wrenches and, having thrown them on both sides, we begin to twist one against the clock hand, while holding the other in place. It should be twisted until the nuts are loosened so that the wheel can be removed.
If the mounting method is an eccentric, then you begin to pull it towards you, slightly unscrewing it and at the same time holding it with your hand, and then take out the wheel. After removing the fasteners, pull the wheel up. it should be easy to remove if the previous operations are done correctly. By the way, if the bike has disc brakes, then you must not press the brake lever when the wheel is removed, since in this case the pads may shrink.
Removing a wheel from a bike
First of all, turn the bike over with the wheels up. But do not forget that if you have hydraulic disc brakes, then it is undesirable to turn over for a long time, otherwise air can get from the expansion tank into the hydraulic line. This means that you have to bleed the brakes. It is better not to press on the brake lever of the hydraulic brakes while the bike is without wheels, as the pads can come together so that it will be difficult to install the wheels later.
How to attach a wheel to a bike
The procedure for removing the rear wheel is exactly the same as for the front. The only detail. you may have to remove the chain from the axle if it clings.
How to remove the rear and front wheel from a bike
The question of how to remove a wheel from a bicycle is one of the most relevant of those that are of interest to a novice cyclist. This procedure may be necessary in order to repair the punctured chamber, eliminate the eights (in the case of using the stand), adjust and lubricate the bushings. Of course, you can go to the workshop so as not to worry about the further performance of your two-wheeled vehicle. But what if there is a need to remove a wheel, say, in a forest? Here you will have to do it on your own, and you cannot do this without special knowledge.
The installation of the rear wheel is identical to the installation of the front, but again you should pay attention to the chain. it can twist. There is no need to remove it, just imagine how the chain was originally, and twist it in different directions until it falls into place.
That, perhaps, is all the wisdom of removing and installing wheels on a bicycle. As you can see, there is nothing complicated about it.
The text was prepared by Roman Borisov. Published: May 29, 2020. Sources : Headings: Microrecords, Repair and maintenance.
- disc brakes
Wheels play a huge role, so you should pay enough attention to them. Experts believe that a cheap bike, if you replace its wheels with better ones, will be much better than expensive and well-known brands.
In any case, re-fitting is a very useful skill, since in many repair services all the necessary actions are not performed. The quality of service in this case decreases significantly.
Some special tools can be used at this stage:
- Spoke key;
- Wheel straightening machine;
- Needle tension gauge.
Of course, it is not easy to find them for everyone, but perhaps someone will still have one or another detail. You can safely do without them, although they can significantly speed up all the work.
So, the following important stages can be distinguished:
- It is recommended to pre-lubricate the thread of the spokes together with the rim, as this will help to tighten them more tightly;
- On the rear wheel, work begins only on the threaded side of the hub. Having inserted nine spokes into the flange, you need to find the hole that will be closest to the valve, insert a spoke into it. It will be key;
- Four holes are counted from it clockwise, then the spoke is inserted, the nipple is twisted. Other knitting needles (7 pieces) are attached in the same way;
- We turn the wheel with the left side, after which nine spokes should be connected to the rim in the left outer flange;
- There should be no intersection between the key and the tenth;
- The spoke heads are on the outside, especially if they are located on the rear wheel;
- The needles, which are considered tensioning, or rather, their heads will be located inside. One of them should be threaded through the flange hole. The sleeve is twisted, while the other spokes must be given a tangential direction relative to the flange. The first two knitting needles from above, the tensioner passes at the top, and under the third, it should go inward;
- When assembling, the nipples only need to be tightened slightly. Otherwise, the knitting needles will not be able to reach the holes;
- It is better to make a uniform tension from the location of the key spoke. It is very important that the nipple is only screwed in one turn. It is allowed to make one or two more if the spoke remains too weak. If, gradually, as the tightening progresses, it becomes clear that the nipples are no longer twisting, then it will be necessary to return, unwind them all again and then tighten each one only half a turn. When the work is done, in addition, it will be possible to fit any knitting needle harder without any problems.
Throughout the work, it is important to monitor compliance with the following points:
- The figured part of the sleeve must be turned to the worker;
- To the right of the person there will be a spoke, which is near the valve hole;
- The rim is connected on the right side of the flange with both spokes;
- Three holes left unoccupied.
The wheel umbrella must always be located in a plane that extends between the rear hub and the tips at least half the distance. If this is not observed, the bike will constantly try to turn to the side. If the umbrella is correct, then the distance from the brake pads to the rim will be equal when the wheel is straight and when it is turned.
Bicycle wheels should be disassembled at regular intervals over several months. It is important to do this for self-service, which will allow you to identify a possible breakdown in advance, replace parts in a timely manner and avoid unexpected failure of this vehicle. Most often, it is the bicycle hub that is the part that needs to be checked regularly for performance. There are two types of them, according to which their analysis will differ:
Disassembling a wheel removed from a bicycle begins with a procedure in which the spokes are somewhat weakened. This requires a nipple wrench. The tape of the same name is removed from the rim groove, then the nipples are unscrewed, and the spokes are removed completely. The assembly of the wheel should take place in stages:
- The spokes (¼ part) are inserted so that their heads are outside the wheel. In this case, one hole should be passed. It is important to remember that if the flange is countersunk on one side, then the spoke is installed in a plane along its surface.
- The threaded ring at the spoke should be passed through the rim hole. All of them are slightly offset from the rim to the sides. The needles are inserted through every three holes. After assembly, you can see that the inner knitting needles are assembled with their heads outward. they are the ones that make up a kind of basis.
- The arrangement of some of the spokes on the wheels is always slightly different. At the back, it must cross the three inner spokes. For the first time, crossing occurs at the flange, and then twice more on the way to the rim. In the case of the front wheel, the outer spoke will cross the two inner.
Observing the order that will be the reverse of removal, the wheel can just as easily be assembled. And if everything is clear with the front wheel, then when installing the rear wheel, it is important to ensure that the chain is fully and correctly put on the teeth of the sprocket.
How to remove a hub gear rear wheel
If everything is done correctly, but the wheel still does not fit into the bosom, then it is worth inspecting it and the bike. It is possible that the fork is bent, or there is a figure eight bending the metal disc. Then all problems must be eliminated and only after that proceed to installation.
Removing the wheel
Removing the front wheel is much easier and more convenient than the rear! This is what many people say, who are not very familiar with the structure of some bicycle models. So, in order to remove the wheels, you must first determine the type of brake device. The disc type of the brake device does not require any additional work, but if a rim system is present on the bike, then it should be released. This is usually done by simply squeezing on both sides of the pads and pulling the arc out of them.
Further actions can be divided into stages:
The rear wheel is removed in the same way, despite the seeming complexity.
Assembling a bicycle wheel
The bike is versatile, very pleasant to use, it is able not only to raise the mood from walks, but also to have a beneficial effect on the body. But he also requires some attention. And in order for it to serve longer, it is important to learn some actions on your own, so that you can solve some problems yourself.
When a person faces the problem of re-fitting, or replacing the camera, the skill of independent parsing and removal of the wheel will come in handy. You can, of course, contact a specialist who can repair a bicycle wheel, but, firstly, it takes too long, and secondly, you will have to pay money for it. But all work on replacing parts, disassembling and assembling them can be done independently. It will be not only more profitable, but also in quality, most often, practically does not differ.
At the last stage, you should deal with the shrinkage of the knitting needles. You can put pressure on them, taking the wheel in your hands, in those places where they intersect. This should be done over the entire surface. After the entire procedure, you should additionally carry out the adjustment and re-shrink. This sequence must be repeated until the crackling accompanying the action stops.
When balancing is complete, it is important to inspect the wheel. If the spokes protrude above the rim, they must be cut off. Further, excess grease is removed and the wheel is completely ready for installation.
In general, parsing, repositioning and assembling a wheel on a bicycle is not so difficult to repeat on your own. Of course, for a beginner it will be somewhat more difficult, however, having tried several times, the next time this instruction may not be needed.