How to remove the bottom bracket on a stealth bike

How to repair a Stels bike bottom bracket?

Stels bicycles are very popular in the Russian market. They have gained wide popularity due to their low cost and high quality. In the Stels range of bicycles, you can find models for both experienced and novice riders. Each bike deserves special attention.

remove, bottom, bracket, stealth

A bicycle is made up of hundreds of different parts. One of these parts is the Stealth Bicycle Bottom Bracket. What it is? This is an important knot that no bike can do without. It connects the frame to the system. This ensures the rotation of the cranks with pedals.

Bicycle bottom bracket Stealth. purpose, design

The carriage transfers torque from the pedals to the wheel. This is the main purpose. In addition, it connects the bike frame and cranks.

In the middle segment of the frame there is a so-called glass. This detail is located in the glass. Now let’s consider the construction.

The bearing assembly consists of the following parts:

  • Slots. A slot is a recess in a product. This is where the connecting rods are attached.
  • Axis. The axle is the main element, it is a special moving part. The axis is located inside the carriage body. There are several types of axle: spline standard (Howitzer), ISIS, Octalink from Shimano, square (most popular), wedge (unreliable). The axis is the source of typing.
  • A cup. The bicycle cup is used to secure the device in a special cup. There are several types of mounts. Each type of mount has advantages and disadvantages. The bicycle cup has several standards. This element is screwed into the frame or pressed in a special way.
  • Housing. The body is an important part of the part. The housing protects all components from damage. Bearings are attached to the housing.

How to identify a faulty carriage?

You can determine the malfunction of the carriage in the following ways:

  • If performance has changed.
  • Outwardly.
  • Aurally.
  • Carry out maintenance.

What you need to pay attention to?

  • Squeak when pedaling. This may indicate that the bearings have failed. In this case, you need to carry out a comprehensive repair.
  • Jammed mechanism. If a jam occurs, inspect the carriage. Repair if necessary.
  • Knock in the carriage. Knocking can happen for a variety of reasons. To eliminate knocking, it is necessary to tighten the cones. If this does not help, then it is necessary to adjust the bearings. To do this, you need to use special tools.
  • The axis rotates with difficulty. In this case, it is necessary to carry out the prevention of the node. If this does not help, then you need to adjust the special bearings.

Carriage Removal Tools

To repair the bearing assembly, you need a set of tools:

  • slotted wrench (main tool);
  • special key;
  • adjustable wrench;
  • squeezing the connecting rods;
  • screwdriver;
  • open-end wrench.


Closed carriages are often referred to as cartridge carriages.

A closed system consists of two elements:

These elements are installed in a robust housing. After that, the body is assembled into the bicycle frame. The closed-type system is in great demand, since it has already proven its practicality more than once.

  • Unpretentiousness. All elements are unpretentious. Part can be used in poor conditions.
  • Maintenance free.
  • Protection. The case reliably protects all elements from the external environment.

Bicycle carriage repair

A stealth bike bottom bracket is a bearing assembly that provides the crank torque function. This part requires service. Repair of the carriage mechanism of a bicycle can be done by hand or use the services of a workshop. For repair and maintenance, you need special tools.


How to clean parts correctly?

Shimano Square Taper Bottom Bracket Removal Guide

  • Mounting points and bearings are coated with special grease.
  • The threaded part of the part is cleaned with gasoline.
  • Damaged parts must be replaced if necessary.

Removing the bottom bracket from a bike

A bicycle bottom bracket is a component that will wear out with use. When this happens, you can disassemble it, replace the damaged parts with new ones, and then continue to use the bike.

Take a bicycle wrench and grasp the pedal nut where it connects to the crank arm. Rotate the nut in the opposite direction from which the pedal rotates when driving forward. Remove the second pedal in the same way.

Remove the nuts holding the wedges. Use a hammer to knock them out. Wedges are disposable parts. after removal they must be replaced with new ones. This can be avoided only if they were knocked out extremely carefully. Remember which cranks and pedals are left and which are right (pedals usually have corresponding designations in Russian or English).

Now the connecting rods can be removed. access to the carriage will open. The nut holding it is located on the side opposite to the drive sprocket. To unscrew it, use a so-called carriage wrench. it is expensive, but it will allow you to repair the bike more than once. If there is no such key, be sure to purchase it, or, as a last resort, attach the head of the nail to the slot of the nut and begin to apply very light blows to the tip so that the nut begins to rotate counterclockwise. This process will be slow, but in no case try to speed it up by increasing the force of the blows.

Remove the carriage and replace it with a different one. Make sure that the new unit is installed the same side as the old one. Screw on the nut first with your hand, and then, when the strength of your hand is not enough, with a wrench or, in extreme cases, using the above method, with the only difference that you will have to rotate it clockwise. Do your best not to rip the threads. Lubricate the new carriage. If the chain comes off, put it on.

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Put on the cranks and secure them with wedges. Drive in the wedges, and when their threads appear on the opposite side, secure with nuts. Screw the pedals into the cranks.

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.

Varieties of parts

Carriages are open and closed:

Closed. cartridges or capsule designs, with internal shaft and bearings.

The closed model cannot be disassembled and is not subject to maintenance (with the exception of a few), in case of any breakdown, the part is replaced.

The advantage of the model is a low level of pollution.

The open carriage features screw-in bowls with bearings in the carriage tube of the frame and a rotating shaft.

This type of mechanism requires precise frame parameters, in case of inaccuracies, distortions occur and the degree of protection against external influences decreases.

The model can be disassembled and cleaned, proper maintenance of the bicycle carriage prolongs the operation of the mechanism for a long time.

The disadvantage of open parts is that they require constant maintenance and periodically warp the carriage shaft.

What roads is Stels Adrenalin intended for?

Due to its weak amortization, this bike is intended only for urban roads at an average distance (up to 50 km per day). The front fork wears out quickly, but replacing it with a more powerful one can significantly extend its life. Stels Adrenalin has reinforced front and rear rims. Therefore, for a while, you can not worry about their curvature.

In order to repair a Stealth bike with your own hands, you will need a little knowledge and all the necessary tools.

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 from the carriage axle, and the connecting rod fixing bolt is removed through the left side.

Trick for Removing a Bottom Bracket on a Bicycle

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.

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:

Removing the carriage from the bike and maintaining it

In this article, we will cover the maintenance of Shimano open bottom bogies. The carriage can be with loose bearings, so when removing it, be careful, as the balls can scatter in different directions, as well as in the form of a non-separable cartridge.

In order to remove the connecting rods from the carriage axis, we need a connecting rod squeeze. The squeeze consists of two components: the right side is for squeezing the connecting rod from the carriage axis, and the left side is for removing the connecting rod fixing bolt.

First of all, we unscrew the connecting rod tightening bolts or, in other words, the screw. which are located at the end of the carriage shaft using a pedal wrench. In some cases, these screws can be hidden under plastic covers, which can be easily removed with a flat screwdriver.

After removing the fixing bolts, using the squeezing of the connecting rods, we screw the puller with the threaded part into the connecting rod until it stops, but here you need to tighten it progressively and without much effort so as not to break the thread. We remove the connecting rod from the carriage axis and wipe the seats. After removing the connecting rods from the carriage shaft, you need to remove the carriage itself, for this you need a shimano carriage puller.

If you have a different carriage type, you will need other carriage pullers. In addition to the puller for shiamno, there is also a puller for integrated carriage cups and is suitable for HOLLOWTECH II, GXP, Howitzer. Another ISIS Bottom Bracket Puller with 8 Splined Puller Mount and is suitable for Shimano, Truvativ and SRAM. All types of pullers can also be equipped with handles, and you do not need an adjustable wrench.

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When unscrewing the carriage, it must be remembered that the carriage must be removed from the left side, that is, from the side where there are no stars on the connecting rod. We take a puller, insert it into the carriage slots on the left side and turn it counterclockwise with an adjustable wrench. It is very important to avoid any distortions of the stripper when unscrewing the carriage cups, so as not to damage the cup itself and the stripper.

You need to twist until the carriage cup unscrews. After that, we perform similar actions on the right side, only here you need to take into account the fact that you need to turn clockwise. After the performed actions, the bicycle carriage will be removed. When replacing the carriage, the old carriage can be thrown away and the new one can be put in. When servicing the carriage, the bearings can be simply replaced with new ones.

After the carriage has been removed, it is necessary to check the carriage cup for dirt, sand and other things that could get there, both through the carriage and the seat tube of the bike.

To service the carriage of a collapsible type, we take the carriage cups and check the condition of the bearings. Carefully wipe the bearings and seats from the old grease and what remains of it with a clean rag. The carriage threads can be flushed using kerosene, gasoline or WD-40. Wipe dry with a rag. After that, we take any thick grease and grease the seats with a small amount and, putting the bearings, add a little more grease. However, collapsible carriages are short-lived and require frequent maintenance and bearing adjustments.

If the carriage is non-separable (cartridge type) and you have any problems with it, then it is better to replace it with a new one. To buy a new carriage, you need to know the shaft length, width (68 or 73 mm) and the type of connection with the connecting rods.

If you have an integrated carriage, then you can change the bearings by replacing the seals. To check the condition of the industrial bearings, remove the boot and see the old bearings. They can be removed with a special puller for internal bearings or disposed of with a hammer and chisel (not recommended). We clean and lubricate the seat, after which we put new industrial bearings.

Before installing the carriage, wipe and lubricate all threaded connections.

What are the pullers

A bicycle crank wrench is a special tool (usually a press) that makes it much easier to remove the system, unlike a hammer.

Each of the above standard has its own puller. In the case of a square shaft, Octalink is a kind of press, which is screwed into the connecting rod head itself, rests on a special platform against the carriage shaft and, by screwing in a nut, breaks the connecting rod. There are cases of breakage of the thread of the connecting rods themselves, if the system was pressed very hard.

The left end cap with Hollowtech II requires a special sprocket wrench. The clamping bolt is tightened with a force of only 1-2 N / m, so a key of this standard is usually plastic, inconvenient, and the cover can be easily unscrewed by hand.

A special tool is good and is worth buying for every bike enthusiast. But still, let’s move on to the main question. how to remove the bicycle cranks without a puller?

How to disassemble and remove the bicycle carriage yourself

Perhaps fans of simple periodic bike rides are not familiar with this term, but those who often use a bicycle as a vehicle, and even more so, professionals in the field of cycling, are aware of what a bottom bracket mechanism is.

Like any mechanism, this part over time is exposed to external influences, wears out or completely becomes unusable, which requires maintenance, full or partial replacement. In any case, you first need to remove the carriage, establish the suitability of the part, and then decide whether to repair it or replace it with a new one.

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 function of the bottom bracket is to connect the crankset to the frame of the bike 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.

Troubleshooting: maintenance, cleaning, replacement

Dismantled the carriage, pulled it out of the frame and what do we see? The condition of the bottom bracket depends on how much dirt gets into it and how much the bearings are worn out. Sometimes the bearings simply shatter and require a complete replacement. This often happens if the carriage assembly has been in operation for more than three to five years.

First, all parts must be checked for defects. This primarily applies to bearings. Then we inspect the carriages, cups with latches. If any component has visible damage, then you need to change it to a new one. The rest of the parts are cleaned in a solvent. The most difficult thing will be to clean the bearings: dirt is very firmly adhered between the balls.

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The space inside the carriage glass is cleaned with a rag. It is better to sprinkle fine dirt with a lubricating spray (WD-40, for example) and wipe the walls with a soft dry cloth.

Removing the carriage: doing it right!

It makes perfect sense to first remove the assembly from the bike frame to fix the problem. To be precise, take it out of the glass. Just about how to do it with your own hands, and the conversation will go.

So, before proceeding with the removal procedure, you will need a set of tools:

  • Connecting rod squeeze.
  • Wrench. If the size of the nut is unknown, then an adjustable wrench will go.
  • Flat screwdriver.
  • Small hammer.
  • Carriage puller for removing from the glass.

Before proceeding with disassembly, all space around the carriage should be cleaned. A damp cloth removes all dirt and dust from the frame, bottom bracket area and connecting rods. This will be enough so that excess dirt does not get inside during parsing. But it will be better if you wash the whole bike. Cleanliness is the best repair assistant. Proven!

Plugs are removed from the connecting rods. Basically, these are plastic covers that can be easily pry off with a screwdriver and can also be easily inserted back. Next, you need to unscrew the nuts securing the connecting rods to the carriage. A squeeze will help in this matter: we put it on a nut, then we take the key and unscrew it. Depending on the type of thread, the direction of loosening and tightening the nuts may vary. There is an option where the thread is right on the left side (counterclockwise. loosening), and on the right side. left (counterclockwise. tightening). Maybe only right-hand thread on both sides, it will be easy to figure it out.

The next step is to remove the connecting rods. The squeeze is inserted at the other end and twisted into the connecting rod. The squeeze bolt is forcibly screwed into the connecting rod, as a result of which it gradually comes off the axis. It is recommended to start removal from the side where there are no transmission stars.

The bicycle carriage is held in place by means of special cups fixed with rings. A screwdriver is attached to the ring so that its end points to the left. By lightly tapping the hammer on the screwdriver, the ring smoothly turns to the left and jumps off. Similarly, by turning to the left, using the percussion method, the cup is also removed.

So, finally we got to the bottom bracket bearings. These small parts can be removed with the same screwdriver: pry, and they will pop out.

And, finally, a removable device pulls out the carriage shaft from the glass. a rotating part that plays a major role in the mobility of the bicycle cranks.

Fault definition

The fact that the carriage has become buggy can be found only when you rotate the pedals. Visually, knot problems are difficult to identify, so it is best to prick up your ears and move your attention to the area of ​​the bottom of the frame. You should not listen too much, especially if you are driving on a busy road. However, if the state of the carriage is not good, it will shout about itself without delay.

A faulty bottom bracket will prevent you from cycling quickly. Blocked dirt, worn bearings and lack of lubrication will continually impede movement. All this is accompanied by an unpleasant creak and a characteristic knock from below. Also, the unit may start to play (broken bearings and axle misalignment).

You can finally check whether it is really worth disassembling the carriage using the standing ride method. To do this, you need to accelerate a little, get up from the seat and twist the pedals. When the carriage mechanism is jammed, the sounds and deterioration of the pedal travel will only increase.

Carriage Lubrication and Assembly

Using a screwdriver, the walls of the glass are processed. Apply the product in an even thin layer. No need to put grease inside the mountain. This is useless. Then grease is applied to the bearing, which is inserted from the side of the stars. The flat bezel should face outward. Then you need to lubricate the carriage shaft and insert it so that the long end is on the transmission side. In general, the carriage is assembled in the reverse order.

The bearing on the other side is inserted in reverse, with a frame into the glass. The cups are lubricated from the inside, and then put on. It is necessary to tighten until the axial play is completely eliminated. In this case, the rotation of the shaft should be slightly constrained. As soon as the fastening rings are mounted, the cup will move slightly and the axle will rotate freely.

It remains to collect the connecting rods. The most important thing here is to put them on so that when pedaling, God forbid, they do not fall off. Procedure for Effective Connecting Rod Assembly:

  • The square is lubricated with a small amount of grease, this will help to push it deeper onto the axle.
  • Processing a screw with a thread lock.
  • Tighten the connecting rod nut with maximum effort until it stops. You can even lengthen the wrench. the thread will not break.
  • Insert plugs.

A bicycle is an extremely unstable unit, therefore, during any repair work, it must be carefully fixed. The frame will not wiggle back and forth, which eliminates the risk of the bike falling to your feet or hands.

The carriage is assembled and ready for use. In general, the procedure is simple even for the first time, and in the future it will not be difficult to disassemble and install the mechanism at all.