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 ratchet and cassette. Although they are similar in appearance, they are very different inside.
In the ratchet, the freewheel is installed together with the sprockets. It is such a monolithic system that is simply screwed onto the bushing. 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 splines. If you are still afraid not to distinguish a ratchet from a cassette, a photo will be an excellent tip in this matter.
How to remove sprockets from the rear wheel of a bicycle: step by step instructions
With active riding, the bike gradually wears out. To avoid this, you must constantly look after him. On high-speed bikes, one of the most vulnerable spots is the rear of the drivetrain. Therefore, sometimes it needs to be replaced. How to remove sprockets from the rear wheel of a bicycle?
Hub sealed bearings-Extract &Press no special tools
Why is it needed?
The most common problem is chain wear. If it is not replaced in time, it will begin to bore stars. Everyone has their own favorite show that they use the most. Over time, the chain on it will begin to spin if a heavy load is applied. Therefore, you need to learn how to remove sprockets from the rear wheel of a bicycle. As soon as such a skill is acquired, you can fix any breakdowns yourself. This will save you a lot of money on workshop maintenance.
Why is this necessary? You can remove the sprockets from the rear wheel of the bike for both regular lubrication and a complete replacement. They will also interfere if you need to replace the spokes on the right side or get to the hub itself.
How to remove sprockets from the rear wheel of a bicycle?
If this is a ratchet, then everything will be a little easier. If there is special equipment, then even a person who has nothing to do with bicycles can cope with this.
This requires only 2 tools:
- special puller;
- adjustable wrench.
First, of course, you need to remove the wheel. Then the stars are removed in two steps. It is necessary to insert the puller into the ratchet, and then try to turn it counterclockwise with a key.
If the mechanism has never been removed, then it can twist strongly (such is its property) and not give in even under great efforts. Then you need to spray the miraculous WD-40 spray there from the thread side. If you leave it like this for a few hours, then the ratchet can be easily removed. It should also be remembered that the larger the lever, the greater the effort. Therefore, you need to take the largest adjustable wrench. Do a couple of jerks and the ratchet will unscrew easily.
You will need another tool to remove the cassette. It’s called a whip. This is a handle to which a piece of a bicycle chain is attached. If you turn the cassette counterclockwise, it will start to rotate. This is where this whip will come in handy, which will hold her. Some craftsmen simply use a piece of an old chain instead of this tool. Then everything is the same as when removing the ratchet.
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 deal with him. In order to remove the ratchet without a puller, you will need:
- gas wrench;
- center punch;
The ratchet has 2 slots. 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 sprockets.
There is still the inside of the ratchet. It is removed with a gas wrench, which is turned counterclockwise.
How to remove a cassette from a bicycle wheel?
After an active cycling season (maybe two seasons), you will most likely need to replace the sprockets on the rear wheel.
When you first remove the cassette from the rear wheel of a bicycle, you will surely have questions: what to turn, which key to use, how not to break the mechanism.
Fortunately, our experience and the right recommendations will help you here.
Cassette Removal Tools
The first thing you need is a whip to hold the cassette. It is essentially a piece of chain attached to a metal handle for ease of use. You put the chain on the stars, rest against the handle as securely as possible and thus fix the stars.
Spare parts To replace the cassette
Now about what needs to be replaced:
The first is the cassette retaining ring. You can use the old one, but usually with regular maintenance, the teeth in the ring are erased. And if you service the bike yourself, there is a great risk that you will completely rip off the teeth at the next removal.
In addition, this ring is always included with good cassettes. So don’t forget to check availability when purchasing.
The second is the cassette itself. There are several important points here:
How to remove a cassette from a rear wheel without a puller (whip) ?
There are several ways how to remove a cassette without this tool It is without a whip. you cannot do without a key to remove it.
Take the old chain, put it on the stars, wrap it around the wheel and try to remove the cassette. Cons. not very reliable, you can scratch the wheel rim. This should be done only in emergency situations (bike trip, race).
Make a semblance of a tool yourself. To do this, you will need a piece of an old chain, a drill / screwdriver, a wooden stick / bar of sufficient density (so that the screw does not pull out). Do not use nails. they rip them out once or twice.
Attach the chain to the end of the bar and use) But do not forget about safety measures! Still, homemade gadgets can suddenly break.
What to do after replacing the cassette?
When you removed the old one, carefully cleaned everything and put a new one (similar to removing, in the reverse order). you need to do a few more simple steps.
First, put the chain and wheel back in place. Please note that we install the wheel only in the “on the ground” position, not in the rack. So it will go into the grooves on the frame as clearly as possible, it will not become crooked and the brakes will not rub.
Secondly, after replacing the cassette, you will have to adjust the gear changes. To do this, you can manually (with a key, of course) tighten the cable on the rear cross-over, and then adjust its length with a bolt-stop in the cross-over or switch.
It will not be very easy to do this for the first time, but with proper skill, keep within 15-20 minutes.
Removing the kickstand from a bike
Bicycle stand: where you need it, and where not
The expediency of using a footboard is determined based on the conditions of movement. The main areas of use of the two-wheeled horse:
- Relaxing rides in parks, sidewalks and paths.
- City road trips.
- Moving on the highway.
- Cycling: city and cross country cycling (hills, forest roads).
- Cycling in various directions.
For the representatives of the first group, a bicycle footboard will serve as an excellent attribute for beauty. Indeed, with simple measured trips around courtyards, parks or playgrounds, there is no particular point in putting a great. As a last resort, you can hold it behind the wheel or lean against something (a tree or a post, for example). Although, if there is a stand, you can sometimes use it and not remove it from the bike: it does not ask for food, and its absence is not important.
The next group is cyclists who ride around the city on “city bikes”. road bicycles with one or more gears or with an installed planetary gear system. As a rule, the footrest is installed on them by the manufacturer.
Moving on to the highways. Anyone who has tried to lift a road bike has always wondered how light it is. Almost complete absence of accessories: there is no bulky trunk, shields, mirrors and bells. There will be no footrest here either. What’s the matter? At high speeds, the weight of the bike is very important: the lower it is, the easier it is for the cyclist to accelerate on asphalt and coast. But how much does this stand weigh? Hardly more than a pound, right? Yes, it is absolutely correct, however, every gram is important for highways, because when driving, its effect on speed increases significantly!
Road bike without footrest
What if you need to park? There are two options: put the bike on the ground and close the rear wheel with an anti-theft cord, or tie the bike frame to a post, pipe, tree, or, if there is a bike parking, drop the bike on it.
Cycling is a popular hobby among lovers of two-wheeled vehicles. Perhaps the importance of a bicycle peg in this area can hardly be overestimated. Cross-country driving is associated with constant obstacles: the roads are uneven and surrounded by dense grass, ravines, steep slopes. If the bike is put on the track itself when stopping, it may interfere with other cyclists or cars. The kickstand will help you position the bike off the side of the road, and even if it gets in the way, it’s very easy to move.
The stand allows bike travelers to position the bike evenly when the trunk is heavily loaded and serves as a support around which the weight of the entire load is distributed. It is only important to find a hard surface, especially if the heel area is small.
But a loaded tourist bike cannot do without a stand.
Among biker travelers, most of the bike stands on a stand whenever it is necessary to get off it to rest, have a snack, take pictures of the area or inspect for malfunctions.
Do i need a kickstand on a sports bike? In principle, if it stands idle for a long time, then yes. But in the process of cycling competitions, she is simply removed from the bikes: she is unnecessarily. For example, why should she be on extreme descents from the mountain (downhill), when the cyclist simply will not stop and, even more so, set the bike. The same goes for bicycles used in BMX: “dancing on two wheels”, tricks on a dirt track, vert, street.
Installing a footrest on a bike
It only takes a few minutes to figure out how to properly install the kickstand on your bike. And this guide to installing a footrest on a bike will help you with this. Some bikes do not have a mounting bracket, but these are either high-priced bikes or antique models that you might not want to mount a kickstand on.
The footrest comes with a bolt and top mount that at first glance does not match the footrest. The only tool you need to install the kickstand on your bike is a wrench. There was a bolt on my footboard that fit a 14mm wrench. You can also use an adjustable wrench.
The photo shows the section of the frame to which the footrest will be attached. If you know where the bracket is, installing the footrest is a snap.
The photo shows how to install the footrest. a second footboard bracket is attached on top of the two bottom crossbars of the frame. Below is the main part of the footrest. The bracket may have tabs to help position the footrest in the correct position (see photo). If you forget about these protrusions, the footboard will interfere with the rear derailleur cable.
This happened to me due to the poor design of the bike. To solve this cable problem, you can simply rotate the bracket. The main thing is that the length of the bracket is enough to hold the footrest.
Insert the bolt from the top into the top of the bracket, into the hole in the bike frame, and into the footrest itself. Twist it up.
All! The footrest has been successfully installed on the bike. Now you can wash your hands, as they are likely to be stained with grease.
Of course, each owner decides for himself whether to purchase such an accessory or not. Why does the choice depend? First of all, on the type of bike, because there are different models on the market, for example, walking, mountain or hybrid bicycles. Then it is worth evaluating the mode of its use. For example, for a road bike, which is designed exclusively for fast movement on very flat asphalt, a bicycle pedestal is not needed, it will even add unnecessary grams of weight and thereby affect speed. Or, for example, why such an accessory for a children’s bike?
But if a lot of movements are planned within the city, or the route is planned for a trip with many stops, then holding a loaded walking bike with your legs or hip is not that not comfortable, but simply not possible.
A variety of accessories are on sale, which differ among themselves by the material of manufacture, the type of support and the method of fastening.
Stands for supporting a bicycle in an upright state are made of steel or aluminum. The steel footboard is highly reliable and durable, while the aluminum footrest is lighter in weight.
According to the number of supporting “legs”, the footpegs are divided into one-legged and two-legged. When the rack of one bike is at an angle to the ground, in the case of two points of support, it can be installed almost vertically. Thus it is possible to achieve that the front wheel will even be raised, as if “hanging” in the air. This will prevent the front wheels from spinning. The two-legged support adds stability to it, it looks like a motorcycle footpegs.
Depending on the design of the bike, the footrest can be mounted either on the side or in the center.
The footpegs produced are, as a rule, universal, they can be adjusted to any wheel size, since the design has a telescopic extension mechanism. If the owner wants to always install his “iron horse” strictly vertically, then he gets a long step with attachment to the frame.
What situations can a cyclist safely avoid, having in his arsenal such an extremely useful “little thing” as a stand:
- When parking, it becomes possible to avoid the fall of the bike when the front wheel is turned sharply.
- Deformation of the trunk from falling is prevented, respectively, it will be great for longer serving the owner.
- When a bike falls to the ground, especially a heavily loaded one, it often gets very dirty in dust, dirt, and the owner spends time cleaning, while the stand will help to avoid such situations.
- Saves a lot of what used to be spent looking for a bike support in case of a stop.
Bicycle footrest, what is this item, is it really necessary? This article explains in detail the types of footrests, as well as the materials from which they are made, the advantages and disadvantages of the attribute. You can also find out about the footrest attachment points, cases in which a bicycle support is needed like air, or when you can do without it perfectly.
What inconvenience can you expect?
During the movement, dirt will collect on such an accessory, so it must be cleaned regularly. She adds, albeit small, but still weight, the structure becomes heavier, it becomes more difficult to develop speed. If it is not properly secured, it can rattle when driving and distract attention from the road.
A footrest is not purchased if they clearly know the places where you can lean your bike on the route.
The footrest of this bike attribute is not only a fashionable accessory, it is also functional, convenient, brings comfort to the owner, makes the bike stylish and modern.
Wheels, handlebars, pedals and a saddle attached to the frame. this is how a bicycle is depicted on diagrams or signs, for example, bicycle parking. In fact, a bike, even the simplest one, is equipped with various attributes, both necessary and not so. These include everything from a trunk with fenders to a bell, a rear-view mirror and a parking stand.
A footrest is a special accessory for a bicycle that gives it a stable position when stationary. There is often debate among cyclists about the usefulness of this device: some simply cannot live without a footrest, but others absolutely do not need it. over, they even take it off the bike they just bought. And if you look at it from an objective point of view? To what extent this accessory justifies itself, we will consider further.
The third way to remove the bearing
If it is not possible to apply the first method, deciding how to remove the bearing with a puller, then use the third method. It will require skill and the use of force, auxiliary tools. What is the procedure for action?
- Study the features of the procedure, how to remove the bearing, assess your capabilities and the degree of skills.
- Find the right tools: soft tipped sledgehammer, wooden stands, vise.
- Fix the removable shaft in a vise and use a hammer, wooden washers to knock out the shaft in the opposite direction.Be careful, do not damage the entire structure of the part with an awkward blow, because it can be used in the future.
Thus, the third method is used in the event that the bearing is completely worn out, does not come out of its seat, therefore, force is required. There are times when it is difficult to solve the problem of how to remove the rear bearings from the shaft, so they simply have to be cut out. This radical method is resorted to by experienced craftsmen, who got a completely worn out running system for repairs, and there is no other way to get the bearing to replace it. It is not recommended for beginners to use the third method, because they simply cannot cope, but can damage other elements of the chassis. In this case, an elementary bearing replacement will cost a pretty penny.
Why you need to change bearings
- Maximum or average bearing wear;
- Finding the element under prolonged pressure during aggressive driving;
- Imbalance of the running system, therefore, it is urgently decided how to remove the bearing and replace it with a new one;
- The appearance of atypical sounds, squeaks when driving a car, cardan hits on the lower body part of the vehicle;
- The detection of wheel play will also make the driver think about how to remove the bearing from the shaft, carefully mount new parts in their seats and restore safe maneuverability to the car;
The main purpose of the bearing is to reduce the friction force and protect mechanisms from rapid wear. There is a wide variety of bearings. They differ in purpose, size and location. The part is subject to wear and therefore requires timely replacement. But in solving the problem of how to remove a wheel bearing, a lot of difficulties arise, therefore experienced craftsmen and amateurs have come up with reliable ways to remove the bearing. Let’s consider some of them.
Stages of work with a puller
- We take a puller, bring it to the worn out bearing.
- Clamp the bearing with a puller.
- We proceed with moderate rotational movements to “pull” the bearing from the seat. Remember that the movements must be forward, without much pressure, so as not to damage the elements of a well-coordinated system.
Thus, the question of how to remove the hub bearing in car services is being resolved. The use of special tools and auxiliary equipment facilitates the work, makes the repair process cheaper and faster.
Method one, how to dismantle the bearing
There are a large number of special devices that, even at the factory assembly, received the only purpose. to quickly dismantle the bearing, without requiring power investments and financial costs from the auto mechanic or the car owner. Using special tools to remove the bearing from the shaft is the best and easiest solution to repair. You can save yourself from unforeseen situations. And for this you just need to follow the instructions. Typically, a standard puller is a threaded shaft that is screwed onto special auxiliary holders. They act as retainers. With this simple puller, the bearing is fixed and removed. All ingenious is simple!
How to remove a bearing from any shaft and replace it correctly?
A bearing is a small element of a vehicle’s technical equipment. At a certain interval, it requires replacement, and all repair work is carried out according to the regulations, otherwise it will be difficult to decide how to remove the bearing and replace it on time. When self-repairing, you can face a lot of difficulties, thinking not only how to remove the bearing, but also first unscrew this or that nut. There are times when the attachments do not give in, you have to use force or additional leverage. But in everything you need to have a measure, not to damage parts that will be difficult to find later, to adapt for a car of a certain brand.
Method two, how to dismantle the bearing by heating
Apply the powerful laws of physics related to metal heating. After all, it is 100% known that metal expands at high temperatures, so there is a possibility that the bearing will jump out of its seat on its own, and it will not be necessary to use physical force, sometimes destructive for the entire system.
Tool for mounting and dismounting bearings
Important to remember! If you are using this method for the first time, you may not calculate the temperature regime or your hand will tremble, then, as a result, dross may appear along the edge of the nest. And now it will block the path of the bearing. ОKalina is recommended to be knocked down beforehand, only then continue to accept the second method.
Which way is better
There is no definite answer, because each repair is a special case. It all depends on the age of the car, the wisdom of the vehicle owner, his responsibility for the technical condition of the car. If a person bought a car to ride, and then sell a “tortured steel horse”, then the auto mechanic will have to work long enough on such a machine, there almost all the components of the system will be worn out. In this case, the second or third option will do. An ideal car repair is carried out in a short time, does not require additional financial investments. The first method. the most professional and efficient. is used by an auto mechanic and will return the car to service very quickly.
Hub maintenance, general bike wheel arrangement
One of the most important parts of a bike is the wheels, as they determine the smoothness and speed of the ride. They come in the following sizes (bicycle rim diameters). 20 (children), 24 (teenage bicycles for boys and girls and for extreme disciplines), 26 (mountain, city and recreational), 27 (road), 28 (hybrid and road) and 29 inch bicycles (new standard mountain bikes).
How To Change The Bearings In Your Mountain Bikes Front Wheel | MTB Maintenance
- Read also how to choose your bicycle tires.
- You can also find out more information about bicycle rims here.
Bicycle wheel device, its main components
Bushings are the most important part of a wheel, since the quality of its rotation depends on the hub. Consists of an axis, balls, drum. The bushings are clamped in the frame drop points using an eccentric (a special clamp that can be easily removed without tools) or two nuts at the ends of the axle (you can remove it with a wrench). Different hubs for disc and rim brakes.
The strength of the wheel depends on the following factors:
- uniform spoke tension;
- the quality of the rim;
- wheel assembly quality;
- stability of the wheel under impacts (profile);
- the number of spokes, as well as the material from which they are made.
Bicycle wheel repair is most often necessary in two cases, not counting wheel punctures:
- alignment of wheels (eights, eggs);
- bulkhead and bushing relubrication.
When assembling the wheel, you will need the following tools:
- wheel machine. a special machine that will help you assemble a wheel with precision;
When assembling the wheel, it is important to select the correct spoke length. In order to accurately select a spoke of the desired length, you can use a special calculator, you just need to make a few measurements. An example of a calculator for calculating the length of the knitting needles:
Based on the calculations, you can start assembling the wheels.
Correction of “eight” on the rim
If a figure eight appears on the rim, then it is easy to fix it with a spoke key. An 8 on the rim may mean some of the spokes are loose and need to be re-tightened periodically. In order to tighten the weakened knitting needle, pull the knitting needle clockwise, and counterclockwise to loosen the knitting needle. Recall that the spoke wrench only rotates the nipple, the spoke remains stationary. We find the place on the rim where the rim wags, you can do this with the help of chalk and rotation of the tire. After finding the place of deformation of the rim, we tighten one side, weaken the other, while the tightening is proportional to the weakening.
Bushing lubrication (maintenance)
As you know, bushings are available on bulk bearings and on industrial bearings.
The hub should be serviced as soon as you notice extraneous sounds, tire rotation, etc.
- Maintenance of the sleeve on loose bearings. It is recommended to change the lubricant every 1000-2000 km. In order to lubricate the wheel hub, it is necessary to remove the wheel from the bike drop points, the camera and tire do not need to be removed, they will not interfere. If you carry out maintenance repair of the rear wheel hub of a bicycle, you will additionally need a whip for removing the cassette and a cassette remover.
bicycle rear wheel hub removal tool
- What to do if the bike squeaks when riding. Discover.
- Find out in this article //velosipedinfo.ru/kak-pravilno-nakachat-koleso-na-velosipede what pressure should be in bicycle tires.
Watch another video of how a complete maintenance of the rear wheel of a bicycle is done. Disassembly, assembly of all its parts, with their mandatory subsequent lubrication.
Maintenance and replacement of carriage bearings
Periodic cleaning, lubrication and replacement of worn parts will help prevent sudden movement problems on your bike. Signs of a faulty carriage condition:
- “Clamps” in the pedals. difficult rotation or cranking;
- connecting rods dangle;
To remove the connecting rods and carriage cups, you will need special tools. pullers and an internal hex wrench. The dismantling process is as follows:
1. Turn over and fix the bike.
Unscrew the retaining nuts with a hollow wrench. You can also use a hammer with a chisel, however, the nuts must be knocked out carefully so as not to damage the connecting rods.
Using a puller, twist them off the axis. It will take a lot of effort here.
Pull the cups out of the glass with a carriage puller. The first is to unscrew the cup from the side opposite to the stars. Then remove the axle.
Remove bearings, inspect and replace damaged parts.
Clean in kerosene, refit and lubricate. When installing, carefully monitor the position: on the one hand, the bearing is placed with balls outward, on the other. inward.
After replacement, cleaning and lubrication, reassemble the carriage in reverse order. After tightening the connecting rods, check their rotation: the lack of effort and cranking indicates that you need to tighten the cups, and vice versa. In these cases, you will have to repeat the disassembly and adjustment.
Prom bearings are installed immediately, no adjustment required.
Varieties and replacement of bicycle bearings
Bearings are special parts for maintaining the performance and fixing rotating assemblies. Their scope applies to everything where there is rotation and mating. The bike did not stand aside, because, in fact, it is a full-fledged transport with all its features.
Bicycle bearings are installed in all parts of the bike that rotate, change position and are under load. They can be found in the drive mechanism. carriage, wheel hubs, steering column and more complex devices. ratchets, switches, rear shock absorbers.
Disassembly and replacement of bearings on the front fork
The wear of the hinge assembly of the fork manifests itself in backlash, heavy steering and extraneous sounds from the speaker. It is not recommended to postpone the problem indefinitely, because the serviceability of the steering, along with the brakes, is a guarantee of safety.
How do I change the bearing for the fork? At first glance, getting close to him is not easy. The assembly is securely pressed and hidden in the head tube. However, in practice, everything looks simple:
- Turn the bike over and unscrew the front wheel.
- Put the bike in the normal position and pull out the stem with the stem (you need a wrench or hex for the inner nut).
- Unscrew the lock nut with an adjustable wrench and pull out the lock washer.
- Unscrew the cup.
- After dismantling the housing, carefully remove the bearing itself. The parts on the forks of most bicycles are not equipped with separators, so we make sure that the balls do not scatter.
- Inspect all components carefully. Be sure to replace rusty, knocked-out balls with new ones.
- Clean the glass, bearing and cup from dirt, and then lubricate thoroughly.
The installation of the fork is carried out in the opposite order: after pressing in the bearing, the glass is twisted, then the washer and the lock nut are thrown. Checking the tightness of the glass: when the bike is tilted, the front wheel should deviate from the straight position by 15. 20 degrees. If it practically does not move, it is necessary to loosen the hinge. A large deflection of the wheel indicates a weak tightening, and the glass needs to be tightened.
Types of bicycle bearings
According to the type of construction, parts are divided into two types: rolling and sliding.
Rolling bearings are two mating parts with grooves, into which rolling elements. balls. are inserted. Their even distribution helps to minimize friction in the assembly and, consequently, to extend the life of the entire bearing. The fixation of the position of the balls is ensured by special partitions. separators. Simple parts without baffles will require more frequent adjustments.
They are used on a bicycle in moving parts where high resistance to abrasion and pressure loads is required and slippage is not allowed. steering column, bushings, carriage. Can also be installed in complex mechanisms. shock absorber hinges and switch rollers.
Plain bearings are ballless parts. They are two elements that rotate tangentially relative to each other. Materials for manufacturing. bronze, steel alloys, metal plastics and everything that has a low coefficient of friction.
Compared to rolling bearings, they are less resistant to abrasion, since the two parts interact directly with each other. Wear causes a gap to appear, which causes backlash. Because of this, periodic replacement of the entire assembly or worn out components, as well as adjustment.
Rolling bearings on bicycles are divided into two types: cone-cup and industrial.
The first. bulk bearings. are open-type parts. They are represented by a cup in which balls are distributed along the groove, fixed with a cone nut. The body is pressed directly into the part itself. the steering column or the bottom bracket.
Prom bearings are closed parts, completely inserted into the movable unit. This is their fundamental difference from bulk. The system is protected from moisture and dirt penetration, resulting in a longer service life compared to cone-cup designs.
Advantages of loose-type rolling bearings:
- ease of removal and installation;
- can be adjusted in the field;
- it is permissible to change components separately.
Disadvantages include frequent adjustments and the need to clean up trapped dust and dirt.
Prom bearings do not require adjustment, lubrication or cleaning. The position of the balls, the amount of lubricant in the closed housing are kept constant. No water or abrasive gets inside the cartridge.
However, if the bearing is worn out, it will need to be replaced entirely. Far from civilization, this is problematic. The price of “prom” is significantly higher compared to the cost of bulk.
Ceramic and ceramic-metal bearings should be noted separately. They are completely or partially made of ceramics, due to which they have higher corrosion resistance compared to their metal counterparts. In addition, they are better able to withstand temperature extremes. Parts of this type are installed on high-end bicycles.
Replacing wheel hub bearings
The hub is not just a wheel pivot. Without the built-in articulation mechanism, forces would be transmitted unevenly to it, and the bike would not be able to move. The same symptoms appear when the bearings are worn out.
Disassembling the hub is as easy as disassembling a fork. For the rear wheel, the procedure will be slightly more complicated than for the front wheel, since you will first need to remove the cassette with sprockets. On a single-speed bike, the retaining ring and the sprocket itself are dismantled.
In general, the disassembly looks like this:
1. Remove wheels from dropouts.
Dismantle the sprockets with a cassette puller and a locking whip. On single speed, open the stopper with a screwdriver or a special spreader.
Unscrew the fastening nuts with a 15 wrench. For the rear wheel hub, unscrew the nut on the side opposite to the stars.
Pull out washers and bearing units. Bulk ones are being moved, industrial ones are being replaced by new ones.
Clean parts and replace damaged components.
Pull out the axles, wipe the inner cavities of the bushings.
Reassemble in reverse order. It is important to place the bearings correctly and press the cones in the same way as before disassembly. In no case should it be skewed, the details should exactly fall into their rightful places. It is not advisable to swap them during a bulkhead. This threatens backlash and deterioration of wheel travel.
New bearings are selected in advance according to the old ones. they must be the same as they were before the repair. Lubrication is the key to rebuilding and replacing (in the case of “bulk”). When installing the “flush”, the assembly itself does not need to be lubricated, only the inner cavities of the bushing and the axle. After installation, we check the performance of the wheels: smooth running without play and clamps indicates that the parts are installed correctly.
So, the bicycle bearing, as we found out, is the most important part in every moving unit. Its good condition, timely maintenance and replacement will ensure good running characteristics and travel safety.
Self-disassembly of the direct drive wheel motor
Electric vehicles of TM Volta Bikes are equipped with motor wheels and high quality components that do not need regular maintenance for a long time. Almost all direct drive wheel motors, the first of which we started selling in 2007, are serviceable and work with our customers, without any repair and maintenance to this day.
During the warranty period (1 year), malfunctions of the motor of wheels with direct drive TM Volta bikes account for 1. 2% of the total number of sold components. The reason for their failure is usually a malfunction of the Hall sensors due to overheating of the wheel motor, water ingress, or the formation of condensation from a temperature drop. Sometimes the Hall sensor fails for no apparent reason. If during the operation of the wheel motor there are any signs of a malfunction, we recommend contacting our service center, where Volta Bikes specialists will diagnose and, if necessary, perform the required repair work in a qualified manner.
For people who want to independently diagnose and eliminate possible malfunctions of a direct drive wheel motor, in this article I will tell you how to disassemble and assemble a wheel motor without breaking anything.
There can be several reasons for disassembling the wheel motor: this is a complete failure of the electric motor, jerking when driving, extraneous noise when rotating a suspended wheel, failure of any elements of the wheel motor as a result of mechanical damage.
The desire to replace the grease in the friction units of the wheel motor (in this case, in the bearings) cannot be a reason for disassembling it: low operating temperature (usually no more than 60 degrees Celsius) and low rotation speeds of the wheel motor have a minimal effect on lubricants. However, bearings, even of very high quality, wear out over time and play and noise appear in the mechanism.
Disassembling a brushless direct drive wheel motor is a relatively simple procedure that requires a minimum of tools and skills.
To disassemble the spoked wheel motor, it is not required to free it from the spokes and rim.
1.Unscrew the bolts of both covers with a hexagonal wrench (fig. 1)
With light blows of a hammer through a wooden spacer along the end of the electric motor shaft, knock out the cover (together with the anchor) a few millimeters, then remove it with screwdrivers (Fig. 2.3)
3.Remove the second cover in the same way.
The rotor of the motor is now held in the stator by the force of the permanent neodymium magnets. Extraction of the rotor will require caution and a sufficiently large effort: very powerful magnets are used in the TM Volta bikes motor wheels (Fig. 4)
In order to remove the rotor, you need to fix the opposite edges of the wheel motor housing on any supporting surfaces (for example, we specially used improvised means), so that the rotor hangs in the air, held only by magnets, and then gently squeeze it down without damaging the magnets and keeping the rotor from falling (see Figure 5).
After removing the rotor, you can proceed with the necessary troubleshooting and repair work.
Support bearings of the axle, or shaft of the wheel motor, are pressed into the covers of the wheel motor; sealed bearings are used here, which are lubricated for life. If the bearing has a noticeable backlash, sticks or makes noise when turning the inner ring relative to the outer ring, it should be replaced.
Three Hall sensors located at the end of the rotor (Fig. 6) are secured with silicone glue. To replace the sensor, pry it with a screwdriver and remove it from the groove. Secure the new sensor with silicone as well. Make sure that the hardened silicone does not protrude beyond the geometric dimensions of the rotor.
When assembling, pay attention to the location of the cable: it must be laid to the side in cases when the motor-wheel rests on the end of the shaft (Fig. 7)
Be sure to place the spring washer on the opposite shaft end (fig. 8) before installing the cover.
We recommend that before installing the covers, lubricate their adjacent surfaces with automotive sealant. Moisture resistance of the wheel motor is an important indicator of its durability.
The wheel hub caps with shaft support bearings center the rotor relative to the stator. Honor follows this when tightening the cap bolts: first tighten all cap bolts 3-5 turns, and only then finally tighten them.
Check the quality and ease of rotation of the shaft at the end of the assembly.
details on how to independently assess the performance of Hall sensors and, if necessary, replace them, we will tell in one of the following articles.
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