Bicycle rear sprocket
Bicycle rear hub: device, ratchet. How to remove a sprocket from the rear wheel of a speed bike?
It often happens that the hub needs lubrication or the rear wheel sprockets need to be replaced. The repair process is easier to carry out with remove the cassette. This way things will go faster and more accurately. Of the tools you need:
An inexperienced user may confuse these two parts, but their difference is that the cassette stars have a minimum diameter of 11T, while the ratchet has a minimum diameter of 14T. To replace the rear sprockets of the bike, you must remove the entire cassette completely.
The ratchet of the rear wheel of the bicycle has several driven stars, which are connected by a freewheel hub. The ratchet is considered not a very durable and reliable component; axle breakdowns often occur due to imperfections in the design. The ratchet can be removed for repairs in the same way as the cassette.
The efficiency and functionality of the bike depends on the rear wheel hub. The part has several components. If the stroke is heavy, then there is probably a problem and the cone is damaged. To eliminate malfunctions, unscrew the nuts with a wrench and remove the wheel. When regularly inspecting the technical condition of the transport, pay attention to the bushing taper, clean and lubricate parts and bearings. This detail is very important, it organizes the transmission of the transmission to the wheel from the pedals, as well as several other important tasks.
How to remove?
First of all, remove the wheel. Turn the bike upside down with the wheels and unscrew the nut on the axle with a wrench. In some cases, for example, a sports bike or mountain bike, you need an eccentric clamp. Simple models do not require a special approach and tool.
Bicycle Freewheel Disassembly/Assembly
The rear sprockets are attached to the ratchet with a special nut (slotted). This very nut must be unscrewed with a puller and a wrench. The latter must be appropriate in size. Unscrew the nut clockwise and use the whip. Requires to insert a puller into the spline nut in the rear sprocket of the bike.
We carefully put the whip on a large diameter sprocket. Holding the cassette, we rotate the puller with the key. This requires some effort. After unscrewing the nut, remove the cassette. The rear sprockets of the bike can be positioned independently of each other on the ratchet. It is required to remove all parts, small sprockets, washers, carefully and carefully. This is to avoid confusion of elements. Then the cassette and plastic ring are removed. After completing the replacement of worn parts, all components, including the sprockets, are assembled in order.
Remove the sleeve
Removal of this part is done after detaching the cassette. It is best to start the process on the left side. Next, the boot, locknut and cone are removed. Then you can find washers, the number of which depends on the type of bike. It is very important to remember exactly the location and order of finding all the parts. Now the stage begins in which the cone is gently unwound. If the grease is in poor condition, it is necessary to remove the bearings and inspect them. The presence of rust, dirt and other troubles indicates the replacement of parts. With this option, good parts need to be put in place before lubrication. With a careful approach to work, the bike will function properly and accurately. Removing the bushing and other parts is not difficult, but it is important to remember the order in which they are located.
How to remove a ratchet from a bicycle wheel? To do this, it is better to use a special puller key.
The simplest bike consists of a whole set of parts. And the biggest of these is the frame. Its function is to provide structural rigidity. In addition, all other elements are attached to it: wheels, steering wheel, seat, etc.
The choice of the remaining components depends on which frame is chosen. For example, a model that is too heavy can overload weak sprockets.
The rudder is used to correct the direction of travel. He also influences a lot. Depending on the position of the steering wheel, the person’s posture changes, which can lead to muscle tension or posture disorders.
The saddle provides support for the cyclist. If adjusted correctly, it will allow you to enjoy the ride.
Wheels with tires ensure that small bumps and bumps do not disturb the rider. And the transmission system will transfer rotation from the pedals to the wheel itself. It is here that there are asterisks, which many do not even consider as a separate part.
The condition of the chain and sprockets is inextricably linked. The fact is that the chain is constantly in motion, engaging certain teeth. This leads to the fact that the wear of the two elements is quickly evened out: a ground gear damages the chain, and a worn chain grinds down the sprockets.
How to disassemble a sprocket on a bicycle?
Any cyclist who respects himself and his bike must have the skills to repair equipment. Then any situation in nature or in the city will not cause panic. Even if difficulties concern the sprockets of the bike.
Replacing the sprocket
You can often see a person typing in the search engine input line the query “bike how to remove the back sprocket”. The reason is quite obvious: it seems that this set of parts is so complex that you can’t figure it out on your own. Of course, there is a rational link in such reasoning: some operations with asterisks require some preparation. However, in general, this is a fairly straightforward procedure. It is enough to perform it several times in order to learn how to do this operation without the slightest doubt and hesitation.
So how do you remove a sprocket from a bike? First of all, you need to remove the wheel, since the sprocket is associated with it. Therefore, the initial procedure will exactly repeat the recommendations for disassembling the wheel.
First of all, you need to turn the bike upside down. In doing so, he will rest on the handlebars and saddle. Additional devices such as a navigator or a travel computer are best removed. But the handles for controlling the brakes and gearshift can be left. You just need to put a layer of fabric under them to protect them from scratches.
Also, before changing the sprocket on the bike (and therefore removing the wheel), you should move the brake pads back. This only needs to be done for the rim structure, since the disc circuit of the device does not interfere with disassembly. The pads are first pressed towards each other, and then the arc is pulled out. That’s it, the pads will now neatly disperse to the sides.
In the next step, you can begin to weaken the axis. On some models, this will require slightly unscrewing a pair of retaining nuts. You will need two wrenches: one will hold the nut, and the other will unscrew the other. If the bike is equipped with an eccentric, then the process is greatly simplified. You just need to unscrew the clamp, then turn the mount several times.
After the axle is free to move, the wheel can be removed. But before that you need to free him from the chain. It should be carefully removed from the sprockets and moved aside. By the way, if the sprockets are removed for replacement, then the chain is also recommended to be changed. After that, the wheel is gently lifted and removed from the fork.
Now you need to carefully remove the sprockets. You will need a whip again. It holds the largest sprocket in the set. The puller can be turned with a wrench. There may be a fairly loud crunching sound, but you shouldn’t be intimidated. It’s just that the surfaces of the spline nut and the smaller sprocket have a grooved surface that makes a noticeable noise when turning.
After the nut is unscrewed to the end, you can remove the cassette. At the same time, special attention should be paid to washers-gaskets, which sometimes come across between small diameter sprockets. They must be carefully removed and set aside until assembly. Finally, the cassette itself and the protective plastic ring are removed.
At this stage, it becomes clear: how to disassemble a sprocket on a bicycle is not difficult. It is her details that are now located next to the wheel. It remains only to check for faults and, if necessary, replace the worn sprockets.
The assembly is carried out upside-down. At the end of it, you will need to adjust the gearshift system and make sure that everything works fine.
Regular inspection of the sprockets is the key to keeping your bike in good condition.
A bicycle cassette is a gearshift assembly, a bicycle cassette assembly is a fastener for transmission stars and spacers. Stars attach to fasteners in descending order.
The smallest diameter sprocket is in the final row from the hub. The gear speed is also counted. To raise the gear means to shift the chain to a big star.
Maintenance of the cassette of a high-speed bike must be carried out systematically: replace damaged sprockets, chain or the entire clutch unit. A cassette is also called a ratchet with a similar set of stars, but significant differences.
Differences between ratchet and cassette:
A ratchet is a set of sprockets combined with a sleeve by threaded or spline fastenings. The bushing is outside, the stars are non-separable, completely installed.
A significant minus of the ratchet is that if one section of the sprocket is damaged, you have to replace the entire mechanism.
The cassette is made in the form of a set of stars connected to a freewheel drum on the rear hub. The parts of the assembly are collapsible, reinforced with an end nut that holds the teeth, and prevents the fastening from being screwed on while the bike is moving.
How to remove a rear sprocket on a bike
Removing the cassette
- Turn the bike over with its wheels up and place it on a flat solid surface, resting on the handlebar and saddle;
- Unscrew the axle fastening nuts and remove the rear wheel and chain;
- Install the puller on the slotted nut and put on it an adjustable wrench (or a suitable socket wrench) with an extension;
- Put a whip on the largest star;
- Holding the whip with one hand, unscrew the spline nut with the other counterclockwise;
- Remove the cassette and disassemble it, carefully placing all the stars and intermediate washers in order.
If in the process of subsequent assembly of the cassette the correct sequence of insertion of the spacers is not observed, this can lead to problems when switching speeds while the bike is moving.
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.
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.
How To Remove And Install A Freewheel Cassette Sprocket On A Bicycle
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 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.
Removing and installing the cassette sprocket
The cassette differs from the ratchet system by the possibility of a separate replacement. It is enough to remove the worn out element and replace it with a new one. The stars are fixed using special rivets with small spacers between them. Due to the fixed position of the stars, it is much easier to remove the cassette. The screwing up of the alleged star itself is simple, mainly you need to do everything sequentially. The sequence primarily concerns large cassettes of high-speed mountain bikes.
Some cassettes are equipped with “spiders”. sections of rigid fixation from a set of sprockets. In this case, the kit is completely replaced, even if the only sprocket is worn out. This rule only applies to large transmission sprockets.
Replacing a single chainring sometimes makes it difficult to switch the chain to it. This complexity is due to the incompatibility of the existing chain wear with a brand new sprocket. A single detail does not play a special role, but a set of brand new asterisks will lead to disharmony in the transmission. To avoid this phenomenon, it is advisable to change the cassette together with the chain.
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 to 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 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 retaining 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, hassle-free ride!