How bearings are placed on a bicycle bottom bracket

Removing the pedals from the bike is easy enough, but don’t forget about preparing tools and materials, as well as possible problems. The main thing is to keep the entire system in order, since in case of damage or other problems, the inconvenience of using the bike will be very great.

Stages of work

Removing the pedals requires a fairly simple tool. wrench and hexagon. The latter may not be suitable for some types of equipment and you can use either a crank puller or a wrench. Often only an adjustable wrench is used. Before starting work, you should know that the right pedal axis is unscrewed in the opposite direction to the clockwise, and left. clockwise. Step-by-step instruction:

  • Using a screwdriver, remove the special plug from the end;
  • Then you need to hold the axis with a key and unscrew the nuts;
  • Next, disassemble the washer, unscrew the cone;
  • Remove the bearings very carefully;
  • It is necessary to remove the pedals from their axis.

Some features

Since the system is constantly exposed to the environment against a background of severe mechanical stress, torsional problems can arise. In this case, two methods are used:

  • Soaking the bike pedal in kerosene or thinner to remove as much dirt as possible that is blocking rotation.
  • Heating of the connecting rod and axle. Slight deformation helps loosen the threads and remove the axle.

It is also important to carefully tighten the axle during installation so as not to damage the threads, which is a considerable problem in case of subsequent removal.

How to remove pedals from a bike

Bicycle. it is the most affordable, fairly convenient and useful means of transportation. Many people are fond of riding two-wheeled vehicles, someone performs virtuoso stunts on BMX, but in any case, timely maintenance and repair of equipment plays an important role. This avoids many unforeseen problems. There are times when the question arises: how to remove the pedals from the bike? Going a little deeper into the intricacies of the design, you can effectively carry out vehicle repairs yourself. Thus, you can feel the technique as much as possible, customize it according to individual preferences and easily deal with unexpected breakdowns.

How to unscrew and remove bicycle pedals

A bicycle is a faithful two-wheeled friend of man and it has a lot of advantages, one of the most important is simple repair. but even the unicycle has pedals. However, many do not know how to remove the pedals from the bike. Let’s see how to do it.

So, first you need to put the bike on the ground so that it stands on two wheels. Pedal release manipulation is very simple and does not take long.

bearings, placed, bicycle, bottom, bracket

Required tools and materials

Before removing the pedals, it is necessary to prepare the tool and auxiliary materials that are most likely to be needed.

  • lubrication. it is recommended to clean and lubricate the removed parts;
  • cleaning rags;
  • kerosene or solvent. in case the axles do not unscrew or there are large contaminated areas.
  • an adjustable wrench is a universal solution, a small one is desirable, otherwise it will be difficult to get to the nut;
  • open-end wrench for 15. fits almost all models;
  • bicycle kit. in case of emergency;
  • pedal wrench. supplied by manufacturers for non-standard nuts and just in sets;
  • puller. addition to the foot pedals. a standard tool, often supplied by the manufacturer, serves to hold the axle when turning to the side with a wrench.

Pedal design

They are not all the same and you need to know a little about their construction. So, the pedal is part of a system that includes a set of sprockets, a crank carriage and, in fact, a set of axles, platforms, bearings and accessories. on this below.

Structurally, a bicycle pedal consists of several parts:

  • The axle is a metal pin that is screwed into the connecting rod. Provides the basis for the rest of the structure.
  • Platform. a plane that contacts the foot and is fixed on the axis.
  • Bearings. the assembly that connects the axle and platform, allowing rotation.
  • Fittings. bolts and nuts that fix all the components of the pedal. Unscrewed during disassembly.

On the platform, the pedals are divided into contact (with fastening for special shoes) and ordinary. The method of removal depends on the type: for contact mechanisms, the fastening scheme is slightly more complicated. Combined options, combining, on the one hand, an ordinary platform, and on the other, a contact device, are no different in terms of dismantling from contact.

DIY bicycle carriage repair

An auto magazine once published an article about two types of car owners: those who take care of their car, and those who just drive and wash just before selling. The author of the article recommended from childhood to teach boys to take care of their transport, starting, of course, with a bicycle. In principle, if you have the right tools, you can actually do your bike maintenance yourself. This applies not only to washing, inflating tires, adjusting pedals, but also repairing some components, for example, the carriage. Experienced cyclists know that the bottom bracket is one of the most important parts of a bicycle that provides the torque function of the bicycle crank arms. The location of the carriage at the bottom of the bicycle causes a large amount of water and dirt to get on it, and as a result, first there are extraneous sounds, indicating an unstable operation of the unit, and then its jamming. That is why it is necessary to carry out regular inspection and preventive maintenance of the bicycle carriage. Truth, but this is possible only if the carriage of your bicycle model is collapsible (the so-called open type) and is an axle rotated with the help of several bearings. This entire structure is easy to disassemble, lubricate and replace individual spare parts. On some models of bicycles, cartridge carriages are installed, which, in the event of a malfunction, must only be replaced, but not repaired. In any case, a person who undertakes to repair a bicycle carriage with his own hands or replace it needs to know the rules of two main processes. removing and installing the carriage.

How to put bearings in the carriage correctly

Bearing types

Bearings are support devices for the moving parts of a bicycle. They hold the parts in place and help the mechanism to function properly, making the pedals rotate smoothly, for example. The rest of the components of the bicycle structure work in the same way.

Since bearings on a bicycle can be in different places, the principle of their operation is different, which means that before changing them, you need to know what types of this product are. They are divided into three types:

  • Ceramic;
  • Plain bearings;
  • Rolling bearings.

Let’s dwell on the extreme option. In total, two types of rolling bearings are used for a bicycle: a cone-cup (or bulk) and non-separable, which are called “cartridge”.

Bulk consists of a set of balls and a cup built into the bike. Cartridge are two rings with balls. They do not need adjustment, since such bearings just need to be changed if the need arises.

Disassembly and assembly of the carriage

Sometimes you have to disassemble the open carriage in order to clean it, lubricate it and change the bearings in the bike. This is due to dirt on the cartridge, as well as due to wear, which can cause accidents while riding a bicycle.

To replace the cartridge, you need to bring the bike upside down and remove the cranks. Start with the nuts, unscrew them with a wrench and fold them neatly in one place. Do not press hard or use tools that could damage the bike, even if the nuts become tight. You need to act gradually and carefully. To remove the connecting rods, a squeeze and a puller are used. A special puller is also used to remove the carriage. but it must be removed strictly from the left side, away from the stars of the connecting rods.

Then you need to clean the carriage glass, in the future this will save the bearings from the harmful effects of dust and moisture. Next, get down to the cups, they need to be pulled out using the keys inserted into the grooves of the carriage, then take out the bearings and replace them. Assemble the knot in the same way as you took it apart.

After assembly, check that the assembly is functioning properly, the connecting rods rotate without effort, and the axle is not misaligned. If problems arise, you need to disassemble everything again to rule out the possibility of a serious error.

Removing the carriage

Some manufacturers of bicycle parts produce bogies with loose bearings that use balls as filler. When removing such a carriage, it is necessary to ensure that the balls do not fall out of the bearings, otherwise they will need to be replaced with new ones. When dismantling the carriage, the connecting rods are removed first, for which a special tool called “connecting rod squeezing” is used. To remove the carriage itself, you will have to purchase an original puller produced by the same company that produced spare parts for the bike. For example, for a Shimano bottom bracket, only a Shimano puller will work. True, there are also universal tools suitable for spare parts from several manufacturers. For example, the integrated carriage cup puller can be used with HOLLOWTECH II, GXP or Howitzer carriages. And the ISIS 8-spline puller is suitable for working with parts from manufacturers such as Shimano, Truvativ and SRAM. The puller must be placed on the left side of the carriage and, trying to avoid it skewing in order to avoid damage to both the spare part and the tool, carefully unscrew the carriage cup. Then you can proceed to those actions for which the removal was made, that is, cleaning, lubricating, adjusting or replacing the carriage and bearings. Also, using kerosene or WD-40 composition, the entire thread is necessarily washed.

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Replacing the bearings in the carriage

The most susceptible to damage is the crank and pedal assembly. It is called a carriage, and the bearings that are located in it can accommodate pedaling if they no longer meet the requirements.

The carriage of a bicycle can be open or closed; the operation of the bearings depends on its type. For example, the open one rotates thanks to the bearings in the cups installed in the bottom bracket and built into the frame tube. This is a complex unit, since it is subject to external influences more than other parts of the bicycle, which means that they need to be changed often. The carriage cup can have different sizes and threads depending on the type and model of the bike.

In closed carriages, the bearings are protected, so dirt from the street cannot spoil them.

Assembly and installation of a collapsible carriage

The collapsible carriage is very similar to the one used on domestic bicycles, therefore the assembly and adjustment process is not difficult.

Before assembly, you need to rinse all the parts in some kind of solvent (I use kerosene), wipe with a cloth and dry. I do not recommend using gasoline. it can damage the plastic seals in the cups. The new carriage should also be washed. the lubricant on it is most likely a preservative. It is also a good idea to check the frame bottom bracket for damage and any debris. Several times I found shavings there, sawdust, which fell into the carriage assembly from the seat tube of the frame. When caught in the bearings, the sawdust will not contribute to the easy ride of the bike.

The carriage is installed in the reverse order of removal.

How to change Bicycle Crank Ball Bearings

When assembling the carriage, the most difficult thing. do not confuse the ends of the carriage axis. its right and left sides are different. Usually on the axle or on a plastic casing (this casing is not provided on some carriages) letters are applied corresponding to the sides of the axle.

The cups cannot be confused. they have different threads (for the left cup, right and vice versa)

We put the plastic cover on the axle. We put the bearings in the cups. If the bearings have cages, then we lay them out with a cage (balls inside the cups). Lubricate the bearings with a thick grease With the same grease we grease the threads of both cups.

We start assembling from the right side. We insert the axle into the right cup, and screw this cup into the frame until it stops. This requires a slotted wrench for the carriage. The right cup has a left hand thread.

Now screw the left cup in the same way on the other side. It has a right-hand thread. Let’s move on to adjust the carriage. (you can go directly to step 1)

Replacing the bearings in the front fork

Loose bearings look like balls moving in a wheel hub. They roll along the groove and create support. The number of such balls is always certain, therefore, during their replacement, it is important not to lose a single one, and also to change the entire set if at least one of them has worn out ahead of time. If you don’t know how to change bearings on a bike but would like to do it yourself, take note of the following advice:

  • Remove the wheel;
  • Unscrew the steering bolt;
  • Disconnect the washer;
  • Unscrew the top cup.

You will find balls under the cup. Be careful not to crumble during the process. It won’t be a problem if your bike has a separator cup.

Loose bearings have to be lubricated and cleaned more often, because they are completely unprotected, unlike industrial ones. The bike will have to be checked more often, to sort out the cups, inspect the wheels and launch new balls in a timely manner if the old ones are worn out.

Square Taper Bottom Bracket Service. How To Overhaul/Remove/Clean/Install

After carefully pouring them out of the cups into the glass so as not to get lost, remove the plug. The cups should be rinsed well to remove dirt, just like the balls. Be sure to dry them or wipe them dry, as moisture affects the device negatively. The balls may rust or deform and will need to be replaced. You cannot use them even if only one is damaged. In this case, you will need to replace everything with new ones. Use grease for the cups, grease the axle as well. Only then reassemble the structure in exactly the same way as it was disassembled.

The main / Repair / Do-it-yourself bicycle carriage repair

Maintenance of bicycle carriages

After removing the carriage, check the condition of the carriage glass for contamination.

Removing the carriage from the bike

Next, we will consider the process of removing the carriages using the example of a Shimano open bottom bracket.

When removing the carriage, you need to be careful, since it can be with loose bearings, which, when removed, can fly apart in different directions.

To remove the connecting rods from the carriage axis, you need a tool such as a connecting rod squeeze. This tool has two functions: its right side is intended directly for squeezing the connecting rod out of the carriage axle, and the connecting rod fixing bolt is removed by means of the left side.

First, using a pedal wrench, unscrew the connecting rod tightening bolts located at the end of the carriage shaft. Plastic plugs (if present) can be easily removed from the bolts using a standard flat-blade screwdriver.

After removing the fixing bolts, proceed to the connecting rods. We take the squeeze of the connecting rods and screw the puller with the threaded part into the connecting rod until it stops. It is very important not to overdo it with pressure, so as not to disrupt the thread. Having successfully removed the connecting rods from the carriage axis, do not forget to wipe the seats.

Then, using a special puller, we remove the carriage itself. In our case, we are using a Shimano bottom bracket puller. A suitable puller is available for each individual carriage model. So, for Hollowtech II, Howitzer, GXP carriages, a puller for integrated carriage cups is used, and for Shimano, SRAM and Truvativ carriages, a so-called ISIS standard carriage puller can be used. It is worth noting that the set of pullers often includes handles, which frees you from the need to additionally use an adjustable wrench.

It is important to know that the carriage is removed only from the side where there are no stars on the connecting rod, that is, on the left.

So, we insert the puller into the carriage slots on the left side and twist it with a handle or an adjustable wrench counterclockwise. In the process, you need to ensure that there are no distortions of the puller. Otherwise, he or the bowl itself may be damaged.

After the carriage bowl is unscrewed, you need to perform the same actions on the right side. Only in this case you need to turn the handle clockwise! As a result of such simple actions, the carriage will be removed and ready for service or replacement.

Want to see how to remove the crankset and bottom bracket? Watch the video review:

Non-separable carriage service

If problems arise with a carriage of this type, it is replaced. When choosing a new carriage, it is important to know the length and width of the shaft, as well as the type of connection with the connecting rods.

Bicycle carriages are:

  • closed (cartridges or capsules), in which the bearings and axle are a single non-separable unit (although there are several collapsible models). Such carriages cannot be repaired or serviced. In case of any problems with operation, the faulty carriage is replaced with a new one. However, it should be noted that closed carriages are less prone to contamination;
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open (collapsible) are a shaft rotating in bearings that are in cups.

The latter, in turn, are screwed directly into the bottom bracket of the bicycle frame. This type of carriage is serviceable and can be easily removed, lubricated, sorted out and reassembled. If necessary, it can also be replaced with a new one.

Maintenance of a bicycle carriage means disassembly, lubrication of its parts, installation and adjustment.

How and with what to lubricate the bike? / About mountain biking

Weather conditions (air temperature, precipitation, humidity) play a huge role. Dry weather grease is fairly easy to rinse off with water. This suggests that it will need to be used more often in the fall and spring. Therefore, it is easier to use a slightly thicker wet-weather lubricant (Wet) in this weather. Bottom line: Choose depending on the weather conditions, try different lubricants and be sure to find the one that is more suitable for your case.

From time to time it is necessary to lubricate the bike and all moving parts. These include, first of all, bearings. First you need to decide how to lubricate them. Many bike mechanics will confirm that bearings are best lubricated with grease, the manufacturer is almost irrelevant, be it Shimano, Finish Line or others.

Previously, the standard for most carriages was the square taper. It is a non-separable cartridge with multiple bearings and a shaft. The price for it was low, while it was possible to drive a lot on it without service, depending on the weather conditions. There was hardly a person who wanted to open it in order to lubricate it. Current bogie standards require bearings to be located in outer cups. The bearings of the carriages are protected from dirt by rubber seals, which are easy to remove. If possible, it is worth checking the carriage bearings for dirt and grease after several rides in very bad weather.

Modern head tube frames most often include an integrated steering column. It is made of industrial bearings that are hidden in a cartridge. However, it is worth checking it periodically. A crunching sound in the head tube area clearly indicates clogged dirt and the need for cleaning and lubrication. Something thick will also work here.

Bicycle bushings are equipped with bearings of two types: closed in a cartridge or open bulk bearings, which are compressed by cones. Such sleeves are considered resistant to moisture and dirt, but water still finds ways to get inside. Even after riding in the worst weather conditions, you just need to check the bearings of the bushings in a timely manner and they will last more than one hundred, or even a thousand kilometers.

With loose bearings, everything is much simpler here. You get to the balls, clean out the dirt and old grease. Use new lubricant, adjust everything properly and continue to ride. To carry out such actions, you will need a special tool. Although, if you are engaged in self-repair, then, most likely, in the near future you will have a whole set of tools. Some bushings are maintenance-free due to the replacement of the entire cartridge and without the use of tools. Although, even in this situation, you can try to get the bearing and clean it.

Forks are tricky to maintain. depending on the design, several different types of lubrication may be required. Some knowledge is needed here and it is better to entrust it to a bicycle mechanic. If you are confident in your abilities, you can search the Internet for a video of servicing your plug.

Before going for a walk, the cyclist himself should spray a little silicone lubricant on the legs of the fork and wipe it with a cloth. Some experts advise turning the bike over before riding in order to allow the oil to drip to the anthers and moisturize them. And one more small addition: if you see dust or dirt accumulating on the legs of the fork, be sure to wipe them. If small particles get under the anthers, the consequences can be extremely unpleasant, up to the damaged coating of the legs.

Someone claims that it is impossible to lubricate the cables, since dust and grains of sand will necessarily stick to the lubricant. From this they will very quickly begin to wedge in their shirts. Others are convinced that it is necessary to lubricate and do it with a liquid lubricant. The one used for the chain is also suitable (not aerosol). It is best if the shift cable jacket is one piece from the handle to the derailleur. So there will be less dust and dirt inside.

There is a good chance that if the seat tube is not lubricated, it will stick to it. The same happens with threaded connections such as pedals or bottom bracket cups. It is better to lubricate any threaded connection of the bicycle or tightly adjoining surfaces, whenever possible. There are cases in which it was not possible to remove or unscrew the part even with a huge effort.

Each of these procedures, with the exception of forks and chain lubrication, must be performed once a season. In fact, the procedures do not take more than a couple of hours. But after them you will be confident in your transport. It is a good idea to lubricate all bearings. Perform maintenance in a timely manner and do not bring the components to a critical state. So they will last longer and you will save yourself from accidents.

Original publication. on cortobike.ru

Ball bearing carriage lubrication

It should be noted that carriages of this type are short-lived, so maintenance and adjustment of bearings should be carried out quite often.

Assembling and installing a bicycle carriage

An important point when assembling the carriage is that the cups are correctly positioned. It is worth remembering that the left cup has a right-hand thread, and the right one has a left-hand thread.

It is worth starting to assemble the carriage from the right side: the carriage axle is installed in the right cup and twisted by the carriage puller until it stops. Then the same is done with the left cup. After that, it is recommended to check the carriage: you need to twist its axis in different directions and make sure there is no backlash (the carriage should turn easily and silently).

At the end of the process, the connecting rods are installed in their places and fixed with screws.

Installing a collapsible bicycle carriage

This type of carriage has a standard device that is well known to all owners of domestic bicycle bikes, which is why it is quite simple to install and configure it.

  • Before starting the installation, we thoroughly rinse the newly purchased carriage and other parts in kerosene (it is better not to use gasoline: it is harmful to plastic, the oil seals in the cups may suffer). We check for small debris and scratches in the frame unit to which the carriage will be attached. If something gets into the bearings from there, the bike will go “with a creak”.
  • We carefully study the ends of the carriage axis (the main thing is not to confuse them!). There must be a special mark on the axle or casings (they are not available everywhere). The bowls have a special thread, thanks to which it is impossible to confuse them.
  • A plastic casing must be placed on the axle. We put bearings in the bowls so that the balls are on the inside of the bowls. The bearings and threads on the cups are thickly coated with grease.
  • We start collecting on the right. We attach the axle to the cup on the right side and screw it all the way into the frame mount using a slotted wrench. Left hand thread on the cup.
  • In the same way we screw in the left cup from the opposite side.

After the installation of the carriage is completed, proceed to the adjustment.

We remove and repair

The carriage can be integrated or non-integrated. The latter, according to the type of device, are divided into cartridge (axle, cups, connecting rods. a single system) and collapsible (parts can be unscrewed so that they can be repaired and cleaned). Usually, the carriages of a walking bike or an average mountain bike are arranged in a standard way, so they can be repaired according to the worked out scheme.

To make it more convenient to operate, it is better to turn the bike with the wheels up and put it on the handlebars.

After you have made sure that the bike is level and firm, you can proceed to repair:

  • Carefully remove from the axle first the left, then the right connecting rod.
  • Thoroughly rinse the carriage assembly, remove the old dirt that has accumulated behind the connecting rods. We clean the splines in each cup very carefully. if they are clogged, it will not be possible to install the puller.
  • We proceed to remove the carriage itself. We start on the left (where there are no stars). If your bike has a lock nut, carefully unscrew it with a wrench (you can use a family man). Nuts of this type usually have a right-hand thread, so you have to make some effort, but try to tighten the nut carefully so as not to rip the wrench.
  • After that we take a spline key or a special key for the carriage. As soon as it enters the grooves, we immediately unscrew the cup with an adjustable wrench with a long handle. If you have a collapsible carriage, the cup must be removed together with the bearing.
  • On the right side (where the asterisks are), we perform similar actions using the same long key. The thread on the cup, accordingly, is no longer right, but left, so force is required.
  • Next, you need to remove the right cup with the axis or the cartridge (depending on the type of carriage).
  • If you have a collapsible design, we remove the bearings from the removed carriage. The places where the old grease remains are thoroughly cleaned. We wash all parts in kerosene or any other solvent.
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After the carriage is cleaned and the parts are dry, we install in the reverse order.

Bicycle carriage repair

Bike bottom bracket problems are familiar to every cyclist. It happens that it loosens up or emits characteristic annoying clicks. This does not always mean that the part needs to be completely replaced. It is enough to competently repair the carriage on a bicycle, without postponing this matter for later.

Adjusting the bearings

Loose bearings are often the cause of extraneous noise, backlash and unpleasant rattling in the rear wheel carriage. Doing so can damage them, deform the cups or impair the clarity of gear changes. If you experience any suspicious symptoms, you need to consider how to tighten the bottom bracket on your bike. In this case, it is better not to postpone the adjustment. If you have the skills, it will be possible to pull up the carriage even during the trip, bypassing the disassembly stage.

  • Starting work, remove the left connecting rod from the rear carriage and unscrew the lock nut with a special wrench. Then, using the slotted wrench, slightly loosen the left cup.
  • We twist the left cup almost all the way. It is worth wrapping it loosely or too tightly, as the axle starts to play or jam. To avoid the latter, slightly (by about ¼ turn) loosen the cup with a long wrench.
  • After that, screw on the lock nut from above and tighten it all the way with the same wrench that was used to unscrew.
  • Checking how the carriage axis works. To do this, we twist it by hand, then we swing it back and forth on the sides. Even a small lift or a barely perceptible jam is a good reason to repeat the adjustment from the beginning.

If you cannot find a balance between play and seizure even after several attempts, you will have to replace either the entire carriage, or worn out or insufficient quality bearings.

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How to determine a malfunction

You will be able to find out about malfunctions in the mechanism of the bicycle carriage only when you rotate the pedals. It is quite difficult to visually verify the problem. You have to listen and pay attention to the sounds that the lower part of the frame makes. However, if all is not entirely bad, you will not hear anything. In case of heavy wear of the carriage bearing, you cannot go wrong by hearing the characteristic sounds.

With a broken carriage mechanism, you will not be able to move quickly. In this you will be hindered by dirt and dust, which are clogged in all parts, as well as a lack of lubricants.

With all this, there is an unpleasant, annoying squeak and knock at the bottom of your bike. You may also find backlash that occurs due to broken, worn bearings or axle misalignment.

To fully and fully make sure that you need carriage parsing, try another method. There is such a concept in cycling as standing riding.

You should do a little acceleration, while standing up and at the same time spin the bicycle pedals. If, at the same time, noises and unpleasant sounds intensify, it means that the carriage is jammed, and it is necessary to disassemble it for repair.

Replacing the bearings in the front fork

Loose bearings look like balls moving in a wheel hub. They roll along the groove and create support. The number of such balls is always certain, therefore, during their replacement, it is important not to lose a single one, and also to change the entire set if at least one of them has worn out ahead of time. If you don’t know how to change bearings on a bike but would like to do it yourself, take note of the following advice:

  • Remove the wheel;
  • Unscrew the steering bolt;
  • Disconnect the washer;
  • Unscrew the top cup.

You will find balls under the cup. Be careful not to crumble during the process. It won’t be a problem if your bike has a separator cup.

After carefully pouring them out of the cups into the glass so as not to get lost, remove the plug. The cups should be rinsed well to remove dirt, just like the balls. Be sure to dry them or wipe them dry, as moisture affects the device negatively. The balls may rust or deform and will need to be replaced. You cannot use them even if only one is damaged. In this case, you will need to replace everything with new ones. Use grease for the cups, grease the axle as well. Only then reassemble the structure in exactly the same way as it was disassembled.

Bicycle bottom bracket: what is it and why?

The carriage is a unit located in the middle of the frame, placed in a special cavity. a glass. Where to looking for? It’s simple: it is hidden where the cranks with pedals and stars are located. The main functions of the carriage are to connect the cranks to the bike frame and provide torque when pedaling.

A quite reasonable question may arise: what, without this device, you can not do at all? There is no bicycle without a carriage. If such a person is still caught, it means that he is not in use now.

Depending on the bike model, carriages differ in size and maintainability. The most common are 68mm knots, but other diameters can also be found. Carriage shaft length range: 110mm, 113mm and 122.5mm.

  • cartridge (disposable);
  • collapsible to be repaired.

The first type includes carriages that are installed in the frame and cannot be disassembled. Obviously, the service life of such a mechanism is equal to the time of complete wear of the bearings or axle. Full sealing of the unit allows you to operate it for a long time even in extreme conditions, not to mention measured driving.

Collapsible mechanisms will require periodic inspection and maintenance from the owner. The latter consists in replacing worn bearings and lubricating the entire assembly. We will just talk about them further: how to remove the carriage, eliminate the malfunction and reassemble the assembly.

Open carriage

The latter, in turn, are screwed directly into the bottom bracket of the bicycle frame. This type of carriage is serviceable and can be easily removed, lubricated, sorted out and reassembled. If necessary, it can also be replaced with a new one.

Maintenance of a bicycle carriage means disassembly, lubrication of its parts, installation and adjustment.

bearings, placed, bicycle, bottom, bracket