An inexperienced user may confuse these two parts, but their difference is that the cassette stars have a minimum diameter of 11T, and in the ratchets. 14T. To replace the rear chainrings 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 breakages often occur due to design imperfections. The ratchet can be removed for repairs in the same way as the cassette.
Here the rear wheel hubs depend on the efficiency and functionality of the bike. The part has several components. If the stroke is heavy, then there is probably a problem and the cone is damaged. To eliminate faults, unscrew the nuts with a wrench and remove the wheel. During regular inspection of the technical condition of the transport, pay attention to the bushing cone, 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. The bike must be turned upside down with the wheels and with a wrench. Unscrew the nut on the axle. In some cases, for example, a sports bike or mountain bike, an eccentric clamp is needed. Simple models do not require a special approach and tool.
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. Need to insert a puller into the spline nut in the rear sprocket of the bike.
The whip is carefully put on a large diameter sprocket. Holding the cassette, turn 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.
Bicycle rear sprocket
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:
- The right size wrench.
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 carefully 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 must 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 of their location.
Tool for work
- Ratchet puller.
- A larger adjustable wrench or a wrench, usually 27 mm, but note that there are pullers with 24 mm edges. It will be more convenient to use a box or socket wrench, since it will be possible to press on it with the maximum possible force, and not being afraid that it will jump off the edges of the puller.
- Open-end wrench 14 or 15 mm for unwinding the sleeve.
- Thick lint-free rag.
- Thin center punch, if you need to disassemble the “nut”.
- A hammer will never hurt.
- NOT lithium grease. Thick oil, generously packed inside the knot, can become a prerequisite for sticking dogs. After that, the pedals often start scrolling Not only back, but also forward.
How to disassemble and remove a ratchet on a bicycle
The bicycle ratchet, popularly also known as the nut, is a ratchet mechanism that allows you to reliably transmit torque through the chain from the pedals and at the same time freely coast without the need to pedal non-stop. This mechanism is assembled as a single piece with the rear wheel hub. Consists, in fact, of the ratchet itself in the form of a toothed drum with two pawls and a non-separable cassette of sprockets.
Simple maintenance of the bike transmission boils down to cleaning it from dirt and grass that gets clogged between the sprockets.
You will need to remove the ratchet from the bike in the following cases:
- To adjust the tightening of the rear wheel hub bearings. You can NOT remove anything, but with a cassette of sprockets unscrewed, it is much easier to remove the ball bearings, determine the degree of wear of the cup, lubricate the assembly.
- If possible, to replace broken dogs. Although these small parts are NOT sold individually and will often require purchasing the complete assembly, they can be removed from the old ratchet. Unfortunately, there are times when, as a result of the premature death of the dogs, the drum from the sprocket either gets jammed, or it starts to rotate freely in both directions.
- When the teeth are worn out to the extreme in the smallest stars or in the event of breaking one of them.
- To install the spoke into the rear wheel hub on the right side, to replace the broken.
The difference between a ratchet and a cassette
Do not confuse the bike ratchet with the 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, 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.
On the inside of the ratchet there are ratchet pawls, the floor of which is installed with an external sleeve from an asterisk. The role of the nut holding these two parts is played by the cone, which is the working surface for the ball bearings. 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.
Removing the Ratchet from the Bicycle
- First you need to remove the rear wheel.
- Remove from the wheel hub. Some nuts, screwed on here, do not allow the puller to fit tightly. But, if the removable device can easily climb onto the Assembled one, then it would be good to secure it with a nut. The retaining nut will prevent the Puller from disengaging when the maximum force is applied to it.
- Support the upright wheel against the wall. The tires do not need to be touched at all, since without it it is very easy to scratch the rim during operation. And the wheel with the rubber on is much easier to hold.
- Insert the puller into the ratchet and with the largest wrench, a jerk to try to twist it. Torque is needed counterclockwise, since the thread that attaches the ratchet to the wheel hub is normal, right-hand. The key lever is better Placed horizontally so that you can press from top to bottom.
- In order to divide the “nut” into two parts, when you need to repair it, you will need to take a hammer and center punch. Also, to replace the carpentry Kerner, you can use a large nail or a larger self-tapping screw. The ratchet mechanism is disassembled by unscrewing the flare nut clockwise, since its thread is reverse, left.
How to disassemble the ratchet is clearly demonstrated in the following:
When pedaling, a fairly large torque is transferred through the chain to the wheel axle, in particular, when driving downhill. With exactly the same force, the inside of the ratchet is threaded to the rear wheel hub.
Always, to Unscrew a long-established “nut” requires a decent effort, which can only be transferred with the help of prepared tools. These tools include a slotted bushing-like puller and a large wrench.
The ratchet puller cannot be replaced with a similar one designed for the attachment cassette. They should not be confused as they have completely incompatible splines.
Unscrewing the stuck ratchet
It so happens that there is not enough effort to disrupt the rattle, which has been tightly tightened for several years. In this case, lengthening the key lever will help.
In many in the garage there is an iron pipe or bar about 60 cm long.Then you can simply put this pipe on the handle of an adjustable wrench or the tooth of an open-end tool, or do it in a clever way and assemble a two-arm lever.
- Take a couple of short, 6-8 cm long bolts M8 or M10 and pick up two Corresponding nuts for them.
- Insert one of the bolts into the hole in the ratchet puller, and thread the other through the hole in the handle of the adjustable wrench. These bolts should be clamped with nuts to hold them in place.
- We insert a pipe between two bolts: a puller installed in its place and put an adjustable wrench on it. Now all that remains is to push the resulting lever down to disrupt the ratchet.
Usually, with a lever from 50 to 60 cm, any Cracker can be unscrewed in almost one motion.
How to remove sprockets from the rear wheel of a bicycle?
It is absolutely not difficult to disassemble the device for replacement, but you should be careful and have a couple of free hours in stock.
In some situations, the disassembler initially takes 15 minutes, and another person without the necessary skills can handle it in 1-2 hours.
That is why it is difficult to answer the question of how much time can be spent on a laborious process. In most, all stars have the same parsing method, since they have almost the same structure.
Helpful hints when parsing:
- How the parts are removed, in this order they should be installed. This advice will help from confusion and waste of extra time that can be spent remembering where a certain detail came from;
- After parsing, every detail needs to be inspected, perhaps it does not require replacement, but a banal cleaning is simply necessary.
Cycling sprocket design
The mechanism externally has several stars of different sizes, which are fixed with a bushing. After that, everything is connected with a lock nut.
- The usual version is that the stars are connected to each other by a plastic spacer;
- Spider cassette. cassettes made in the form of stars, fixed on an aluminum frame;
- Several Spider. devices that have a high cost and are usually installed on professional and expensive models. The appearance has 2 spiders, which are connected by sets of stars;
- X-Dome is a monolithic system that connects the drum to the lid on the opposite side;
- Openglide. Most Relevant In Road Bikes.
Why you need to change sprockets on a bike?
The sprocket on a bicycle has one of the main roles that affect ride quality and speed. During the use of a two-wheeled vehicle, a load is exerted on all its component parts.
Replacing the sprockets is essential for correct function and gear shifting If you do not repair parts immediately after damage, there is such an option that broken parts will accumulate and repair will be quite expensive, in some situations it exceeds the cost of the bike itself.
How to replace a sprocket on a bike?
Replacing the sprocket should start with removing the old one, respectively, only then start the installation. If an old part is installed, it must be cleaned and lubricated, only then install.
In the case of a new one, you need:
- We put on a protective plastic ring;
- If the stars themselves are not fastened to each other, then they should be worn one at a time, starting with a large one and ending with a small one. Place small rubber pads between the stars
- We screw it with a nut, this must be done directly with a wrench. Twisting is carried out according to the hour hands;
- We fix the nut and check the movement of the nut.
How to remove a bike cassette
First of all, you need to prepare the necessary tool:
- Cassette Retaining Ring Remover;
- “Whip”. a special key to which a bicycle chain is attached (fragment)
- Adjustable wrench.
You can, of course, do without the specified specific tool. Moreover, there are 2 such methods and both will “work” 100%:
Be sure to prepare an area with a level surface that should be within arm’s reach of the bike. this is how you can save and NOT lose all the parts of the bike cassette.
Step-by-step instructions for removing the cassette:
- The bicycle wheel is removed, a special puller is installed. Necessary Pay attention to the correct installation of this tool: its splines must completely enter the grooves of the retaining ring.
- The “whip” key is taken into the hands, put on the sprocket in such a way that the fragment of the bicycle chain on the key is on the sprocket teeth. We draw your attention to the fact that the handle “whip” should be in the case here of the cassette, a fragment of the tool chain. at the top.
- An adjustable wrench is placed on the cassette remover and rotated counterclockwise. Simultaneously with this movement, it is necessary to firmly hold the “whip” key in a fixed position. thus, movements / scrolling of the sprocket are blocked.
Note:In some cases, the chain may jump off during this process, which means a strong wear of the cassette sprockets or breakage of the “whip” key. Experts recommend putting a “whip” over a large sprocket. you can get the desired fixation effect.
- The retaining ring is completely unscrewed, the cassette is removed.
Be sure to make sure that the removed cassette, as well as the sprockets and all fasteners, are located in a removable form exactly in the order in which they were in the original version.
After removing the cassette, you can start cleaning and lubricating it. these procedures are among the mandatory for regular service of a two-wheeled vehicle.
With 7 stars
To perform dismantling, you must in advance make sure that the retaining ring is present and familiarize yourself with the technology of clamping all the sprockets to each other. In budget transmission models, the sprockets are NOT bolted, but rigidly connected with rivets. Unmaintained specimens can be thrown away immediately if something happens to their teeth.
In order to remove the sprockets from the bike, you must:
- Puller, which is suitable for slotted concept and for retaining rings;
- Whip. a metal key, consisting of 10-20 links;
- Adjustable wrench.
How to replace a rear sprocket on a speed bike
There are not many key parts in a speed bike. The main ones include the stars, which serve to switch speeds with the provision of gear ratios in the transmission. With the constant operation of the bicycle mechanism, worn sprockets are formed. This is facilitated by the usual physical process. friction. What is the threat? The chain starts to jam and simply slips deformed parts.
The problem that has arisen requires an immediate solution. If the question is ignored, then any movement on the road will turn into a solid negative. The modern VELOBIKE model allows you to change a worn out part. Our article will tell you how to replace the rear sprocket on a speed or mountain bike.
Disassembly process of transmission cassette
Some theory beforehand. On the rear wheel there can be two variants of parts related to gear shifting.
- Transmission cassette. This product features modern and innovative spline mountings that attach to the hub axle.
- Ratchet. A somewhat outdated model, typical of inexpensive speed bikes. The set contains no more than seven gears. As for the mount, it has a thread with external installation parameters.
Immediately focus on the ratchet. Changing the rear chainring on a ratchet bike is not possible. Only change the entire component completely.
Therefore, the topic of the article will be a problem describing a situation when a bicycle cassette star needs to be replaced. As for the set of stars in the transmission, there are options up to 11 pieces, depending on the bike model.
Ratchet and cassette elements
So how do you change the rear sprocket on a speed bike? Consider the algorithm of actions.
- I took a bicycle key for the rear wheel, dismantle it. We sequentially unclench the levers and weaken the fixation of the nut.
- Now it is the turn for the axle nuts. Using the second key, we turn off the mount.
- The next stage involves unscrewing the bearings of the cone and pulling it out.
- We take out here with all the elements.
Sleeve recessing process.
- We take a special tool. a cassette remover. We insert it into the slots.
- The whip is placed on the largest sprocket. We make rotational movements clockwise.
- At the same time, using an adjustable wrench, the puller rotates in the opposite direction.
The preliminary stage is over. Such simple actions are possible in ordinary home conditions. We emphasize that if the wear is not one star, but several, then it is better to replace the entire cassette at once. This option is also desirable when the largest star is damaged.
And one more recommendation. We put all small parts, washers and nuts in a certain place, so that later you DO NOT search throughout the room
How to remove sprockets from the rear wheel of a bicycle without a puller?
For such an operation, you do not need to purchase a special tool. True, it is much easier to handle him. In order to remove the ratchet without a puller, you will need:
- Gas wrench;
The ratchet has 2 recesses. You need to insert a center punch there and hit it with a hammer. You need to direct it clockwise. You can use a large nail instead. You have to be careful, as there are bearings under this place. With a little effort, you can screw the stars.
There is still the inside of the ratchet here. It is removed with a gas wrench, which is twisted counterclockwise.
The drivetrain plays a very important role in the operation of the entire bike, so you must carefully monitor the wear of its SEPARATE parts. This is especially true of 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.
Required set of tools
Before starting the replacement process, acquire the necessary tools that may be useful to you. It:
- Cassette removers
- Rozhkova and adjustable wrenches
How to properly disassemble a cassette?
First, remove the rear wheel from the bike. This is very easy to do. Unscrew the nut with a wrench and release the chain. The owner of mountain models will simply press on the special mount and the wheel will be dismantled.
Next, install the removable device on the slotted nut of the cassette. Here we need a whip, which will prevent the cassette from turning. While we rotate the puller with an adjustable wrench, hold the whip to the largest star.
The process of dismantling and replacing the sprocket
Using the nut, unscrew the cassette and remove it from the wheel. We carefully examine the stars and determine which of them 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 are removing the used parts from it and replacing 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.
On some bikes, you may find so-called “spiders” in the configuration. This is a group of several stars, which 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.
What You Should Know in Singlespeed?
If you own a single speed bike, the process of replacing the rear chainring will be simplified to a minimum. You just need to unclamp the circlip. If the original 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 force manipulations. Therefore, if you are talking about a single-speed bike, everything is very easy and understandable here. However, Owners of such models should carry out the process of dismantling the cassette only if one or more of the Largest sprockets 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 promptly replace worn-out parts. A working bike is the main guarantee of your safety and a cool, trouble-free ride!
Types of bike transmissions
The gear range setting is highly dependent on the driving style. Let’s consider the most typical cases
A little about singlespeed
To remove the rear transmission sprocket from a single speed bike, you only need to release the circlip. Among the fans of singspeeds, you can hear that the regular ring is useless and can break, 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 placed, it is not even necessary to compress 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 chainring with a larger diameter.
As you know, without serviceable stars and a chain, the Great One will not even be able to move. Timely replacement of components of the transmission system is the most important component of repairing any type of bicycle. from simple road two-wheeled “bugs” to road and mountain superbikes.
Mountain Bike Drivetrain (All Mountain)
The All Mountain drivetrain features a single chainring sprocket, combined with an 11 chainring at the rear. This makes the bike easy to operate, fast and functional at the same time.
You can determine the optimal settings by trial and error, taking into account your own riding style, the size of the VELOBIKE wheels and a number of other factors.
Removing the cassette
To remove the sprocket cassette from the rear axle of the bike, you must:
- Turn the bike upside down 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, the other Unscrew the spline nut counterclockwise;
- Remove the cassette and disassemble it, carefully placing all the stars and spacers in order.
If, during the subsequent assembly of the cassette, the correct sequence of installation of the intermediate washers is not observed, this can lead to problems when switching speeds while the bike is moving.
Sprockets are important transmission parts. For the bike to function normally, you need: the correct choice of gears, careful and timely maintenance, replacement of worn parts. All this allows us to make trips safer, to avoid unpleasant surprises on the road. As for the high-speed big one, it will really show itself to be high-speed, and will not be sadly dragged along in a single gear.
On this topic
The difference between a ratchet and a cassette
Before removing the sprockets from the rear wheel of a bicycle, you need to decide on their design. It is important to distinguish between ratchets and cassette. Although they are similar in appearance, they are very different inside.
The freewheel is installed in the ratchet together with the sprocket. This is such a monolithic system that is simply screwed onto the bushings. The cassette can be disassembled, so one worn sprocket can be replaced. Unlike a ratchet, it is not a monolith with a freewheel mechanism, but is put on it.
To remove them, you need different pullers. It is important not to confuse them with each other, because they are NOT interchangeable. They have different slots. If you are still afraid NOT to distinguish a ratchet from a cassette, a photo will be an excellent tip in this matter.
To remove the old part, just as when removing the ratchet, only 3 tools are required:
- Two-wheeled vehicle retaining ring puller. needed to unscrew the nut;
- A whip key is a tool with a bicycle chain. It is necessary to fix the position of the cassette, because dismantling occurs with a freely rotating wheel;
- Adjustable or box wrench.