How to fix a figure eight on a bicycle with your own hands

Causes and types of defects

The most common types of bicycle wheel defects are figure eight and egg. The occurrence of deformations is facilitated by the active operation of the vehicle and intensive driving on uneven bumpy roads.

You can identify and correct these types of deformities on your own, without resorting to the help of a qualified specialist. It is quite easy to diagnose the presence of defects. To do this, turn the bike upside down, placing it vertically.

Next, you need to spin the problem wheel by rotating it around the axis. As a rule, the figure eight is visible to the naked eye. If we are talking about a slight deformation during the rotation of the wheel (if the figure eight is not visible, upon first examination), a characteristic clicking sound will be heard.

How To Do A Figure 8 / UK Mod 1 Motorcycle Test Exercise

Causes and prevention

The appearance of deformation is possible due to long-term use. The main reasons for the emergence of the G8 are:

  • when the vehicle is moving, a vertically directed load acts on the structure, which depends on the weight of the cyclist;
  • careless, careless driving, falls, hitting bumps, falling into holes will affect the symmetry and lead to deformation;
  • a high-quality rim several times reduces the likelihood of the appearance of a “figure eight”, in budget models already at the time of purchase there may be a defect;
  • regular active driving, hard braking, tearing accelerations, sharp turns at a strong angle contribute to the curvature of the rim.

Rim curvature isn’t just caused by a dashing ride. Even with proper use of the bike, deformations inevitably appear over time.

The best professional advice for prevention is to regularly inspect the rim, spokes, center hub, tires for faults or wear. It is necessary to carry out timely replacement of bike assemblies and parts. This will avoid unnecessary problems and expensive repairs.

figure, bicycle, hands

Careless driving, falls, collisions on bumps Poor-quality rim Regular active driving, harsh braking

How to fix a figure eight on a bicycle wheel

Power

The basis of this method is to align the rim using brute force. You can fix the figure eight on a bicycle by following the step-by-step instructions:

  • remove the wheel from the frame, do not dismantle the tire;
  • we wrap the tire on both sides, turn the wheel with a deformed section towards us;
  • we put our knee to the very center of the figure eight and push hard away from ourselves.

Optimal grip. 60 degrees on both sides of the center of curvature.

To straighten the rim in this way, you need to have physical strength. To correct a large deformation, it is better to call an assistant who will hold the bicycle wheel, pressing it to the floor. If you apply enough force, the curvature will smooth out.

Such an edit is perfect on the road, away from the village. However, the method has many disadvantages:

  • eliminating small curvatures will not work;
  • not all rims are corrected by force;
  • inconvenience in work;
  • you can accidentally bend the wheel rim in the opposite direction.

You need to act carefully and skillfully, otherwise you can achieve the opposite effect.

Deformation elimination algorithm

First you need to determine the problem area as accurately as possible, identifying the lesion focus. Next, you need to find the central wire in the affected area.

Please note: if the figure eight falls to the right side, the first step is to tighten (or loosen) the spoke on the opposite side with a spoke wrench.

After performing the manipulation (you need to tighten the needle little by little, by about 1/3 of a turn), you must immediately check the result. Next, in the same way, you need to tighten the adjacent knitting needles on the opposite side. The number of key turns for tightening adjacent spokes should be approximately two times less than the central spoke tightened. As you move away from the deformation site, the number of revolutions should gradually decrease in proportion.

How can you fix the “eight” on a bicycle wheel, basic methods

Cycling is a great pastime with family or friends and has health benefits. But while walking, you can accidentally hit a bump or fall into a hole. The main force of impacts falls on the wheel, as a result, it can deform, which will lead to various problems with the rim. Not all users know how to fix the figure eight on a bicycle wheel on their own. There are several main ways. Mastering the technique will not be difficult.

Eight bicycle wheel. determine the exact place

To determine the exact place of deformation, it is necessary to turn the bike with the wheels upward. Next, you need to rotate the problem wheel, gradually bringing the chalk or marker to the spinning rim. Where there is a figure eight, the crayon or marker will touch the rim. These places should be noted. This is how you can determine the problem area. the hearth of the eight.

There is another method for determining the focus of the figure eight using ordinary ear sticks, adhesive tape and a marker. To identify the problem area of ​​the rim, you need to stick the ear sticks with tape on the front fork feathers on both sides. The areas where the ear sticks will come into contact with the rotating rim are problem areas. It is here that it will be necessary to tighten or loosen the spokes in accordance with the algorithm described above.

Elimination of the figure eight defect is a simple process, but troublesome, you can cope with it yourself without the help of a specialized specialist. This method is flexible and suitable for different types of bicycles.

Important: after eliminating the defect, it is imperative to check the degree of tightness of all the spokes of the problem rim. This will help you avoid unexpected accidents on the road.

If you still have any questions regarding the methodology for determining the problem area and eliminating deformation, we recommend that you watch the video instruction:

Defect elimination tools

To repair your vehicle yourself, you will need the following tools:

  • marker or chalk;
  • plastic assemblies for dismantling the tire;
  • spoke wrench.

What is eight?

If you quickly scroll the deformed rim, you will notice that the wheel follows the contour of the figure eight.

This happens because on impact, one or more parts of the rim are bent and deviated from the plane.

Although the figure eight is not catastrophic damage, and you can ride with this wheel defect (of course, if the rim is not completely bent), such a trip will not bring pleasure.

First: the rotation of the deformed rim will be accompanied by jolts and impacts that will affect the cyclist.

Secondly: the rotation of such a wheel will require a lot of effort.

And thirdly: if the defect is not corrected in the near future, it can lead to more serious and costly breakdowns of the “iron horse”.

Mountain biking. How to fix a figure eight on a wheel and change spokes?

A figure eight on a bicycle wheel is the most common deformation. Today, when creating bicycles, the latest technologies are used, but even on an ultramodern bike, the wheel remains very conservative, spoke. The design in this case does not represent anything complicated: the bushing, but the rim and the spokes that unite them. During operation, every cyclist is faced with wheel deformation. And the appearance of the “eight” on the wheel is far from uncommon. This is due to a violation of the integrity of the rim and looseness of the spokes.

And yet why does this deformation occur? During operation, the wheel is inevitably subjected to stress as soon as the cyclist takes his place on the saddle. We add road irregularities. pits, bumps, poor coverage or lack thereof, and the question of the reasons for the emergence of “eights” disappears by itself. In addition, inexperienced cyclists often distribute their weight incorrectly on the bike, which also increases the load. Sharp braking, jumping and other extreme sports, as well as long-term operation, also make it necessary to adjust the wheels.

As you can see, during operation, the bike experiences loads that are least dependent on your riding style. Over time, the geometry of the wheel rim changes. it deforms. The speed of its manifestation depends on the presence of defects in the rim (figure eight, displacement of the “umbrella” and “egg”). It should be noted that the service life of wheels often also depends on the materials from which they are made and their quality. Sometimes inexpensive models may require repair much earlier than those made from expensive components (for example, a high-strength rim).

How to tell if a wheel is bent?
When there is a suspicion that the wheel has lost its original shape, the bike should be turned over and a thorough inspection should be started.

First you need to inspect the wheel in the place of the expected curvature. To do this, spin it, while in the case of the rear one, you can do this using the pedals. It is visually obvious that the curved sections move to the side during rotation. Now it remains to grab it with your hand in that place and stop it, which is quite difficult.

Another, more powerful way is to use a crayon or marker. When spinning the wheel, it must be brought to the rim. First of all, the stroke will remain on the bulge of the figure-of-eight. By spinning more strongly and bringing the chalk closer to the rim, you can also determine the boundaries of the curvature.

How to fix the “eight”
And now the curvature is found. Each cyclist can fix it with his own efforts, and, given that deformation is not a rare phenomenon, valuable experience comes over time. There are two ways to get rid of the “disease”:
power rectification;
tightening and loosening the wheel spokes.

Required set of tools for deformation elimination:
1) chalk to mark the area with a defect;
2) a spoke key;
3) wheel straightening machine (desirable, but not required).

The figure eight, small in size, can be eliminated without dismantling the wheel. To diagnose the problem, turn the bike upside-down to check that the wheel is in the correct position relative to the brake pads. This process can be divided into several operations. First you need to identify the deformation. As the wheel rotates, press a piece of chalk onto it. In places where the figure eight is formed, you will see a corresponding trace. This simple method will help you determine the exact location of the rim deformation.

Next is the tightening and loosening of the knitting needles, but only from a certain side, which will be described in detail below. If such manipulations are performed with inaccuracies, you can give the wheel even greater deformation. There are several ways in which it can be removed.

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Power straightening
Considering this scenario possible, the wheel should be removed from the frame. However, the tire and the camera should not be removed. We turn the wheel with the bulge towards ourselves and grab the rim and tire with our hands. At the same time, the average deformation requires a hand position equal to 10 and 2 o’clock on the dial. We use the knee, putting it on the convex area, and push hard from ourselves.

If there is enough strength, this is done by weight. Or you can position the wheel vertically, with the deformed section up. In this case, the help of a partner is required, who will press the wheel to the floor. After this extreme straightening, the wheel is returned to the frame and tested.

But this method is not always effective. It is not accurate, small deformations are not corrected. Among other things, inept actions can provoke new bends. Yes, and not every rim will succumb to the impact of the foot. high-strength modern wheels will remain “on their own”. Although, if the wheel let you down somewhere along the way and the “eight” happened suddenly due to, for example, hitting a large stone, “force straightening” is the only possible way.

Wheel spoke adjustment
Bicycle running characteristics often depend on the correct tension of the spokes. The tension on the spokes adds strength and elasticity to the wheel. In this case, the tires are removed, the tension of each spoke is carefully checked. It happens that the rim is bent as a result of their general weakening. In a situation where the spokes dangle like guitar strings, they should be tightened 1 turn of the key. In the found area of ​​curvature, a spoke is searched for, located in its center, that is, at the bulge itself. The turn of the knitting needle must be carried out in the direction opposite to the direction of the bulge. In this case, the spokes located on the sides of the central one are weakened.

If the figure eight is between the two nearest knitting needles, then using a special key, the first knitting needle is tightened by a third of a turn, and the knitting needle next to it is twisted in the opposite direction, loosening the clamp by a third. If the figure eight is three knitting needles, the following actions are taken:
tightening the central spoke by a quarter of a turn with a key;
slight loosening of the outer needles (half the tension in the center).

If the figure eight has a size of seven spokes, the procedure is as follows:
the central spoke is tightened by half a turn;
the second and third needles must be loosened by a quarter of a turn;
the fourth and fifth are tightened by one eighth;
the sixth and seventh (i.e. extreme) are weakened by one eighth.

That is, the alternation of tension and stretching of the spokes should be carried out so that the outermost spokes of the “figure eight” are weakened. After the procedure, the wheel is installed in its place and tested for possible distortions. If the figure eight is bent in the opposite direction, all tension is eliminated and tightening on the weakened spokes is increased. After which everything is repeated, but to a lesser extent. The result of a long operation is the alignment of the wheel to a perfectly flat circle. At first, the work will not go so quickly, but with the acquisition of experience, the speed of adjusting the spokes also increases.

Change the needles
Not all craftsmen know how to assemble wheels efficiently, and therefore it is best to learn how to do it yourself. The assembly is carried out according to a certain algorithm.

Knitting needles work:
it is necessary to lubricate the thread of the spoke and the rim in places where there is contact with the nipples, otherwise the spoke will not be tensioned with sufficient rigidity;
in a situation where the flanges of the hub have a countersink on the only side, the spoke heads are on the non-channeled one, it is needed to bend the spoke;
nine spokes are inserted into the flange so that there is an unoccupied hole between them, and so that the heads are located on the outside. In a rear wheel situation, start from the right side of the hub;
on the rim, among the holes shifted to the right, you should find the one closest to the hole for the camera nipple;
the first spoke is attached to this hole, it is considered the key;
from the key spoke, four holes should be counted, moving clockwise, put the next spoke and wrap the nipple;
as a result, there should be three unoccupied holes between the knitting needles, the knitting needle closest to the valve hole is located to the right of it, and the cut part of the sleeve is facing the master;
then the remaining seven spokes are fixed, while every fourth hole in the rim is used;
after turning the wheel, nine more spokes are connected to the rim, inserted into the left flange from the outside;
the tenth spoke should be to the right of the key, adjacent to it, but not crossing;
after mounting the tenth knitting needle, the next eight are recruited in the sequence specified above;
and now the drive spokes are already in place and their heads are on the outside of the flange. In this case, the nipples are turned only for a certain number of turns;
tension spokes are installed with heads on the inside of the flange. A spoke is threaded into the flange hole and the sleeve is rotated so that all the spokes in place receive a certain direction that is closest to the tangent relative to the flange. The first tensioning needle must cross the three driving ones standing in place, while each tensioning needle must pass from the outside of the first two crossed by it under the third, also crossed;
the rest of the spokes get on the same principle.

Tension
Before tightening the spokes, screw all the nipples equally. Then you need to start the process by screwing each nipple one turn. If there is a “shiver” in the needles, the tension is increased. We install the wheel for testing and remove all defects of the “eight” type.

Eliminating radial runout
An oval “egg” wheel rim looks like this: one part of the rim is closer to the center than the rest. This wheel flaw appears after unsuccessful landings. Fixing such a breakdown is much more difficult than the usual eight:
1) remove the tire and inspect the rim;
2) turn the bike body over, spin the wheel, holding an object on top. Mark with chalk the part of the rim that will lift the item;
3) simultaneously trace three directions:
– loosen the tension from the center spoke;
– pull the adjacent knitting needles by the same number of revolutions so that there are no eight;
– the spokes at the opposite end of the wheel should be tightened to prevent the appearance of an “egg” in another place.

To eliminate such an eight, considerable experience is needed, the process is characterized by its own difficulties. After correcting the “eggs”, you need to press on the knitting needles with all their weight, as in the above scheme. to shrink them. Editing “Umbrella”
Cyclists are familiar with the concept of an umbrella. The defect is as follows: the wheel rim is displaced to one side and is not perfectly aligned with the center of the hub. How severe this bias is for the bike itself depends on the frame design and the brake configuration. This type of malfunction often occurs when the wheel is not assembled correctly. The “umbrella” is eliminated by analogy, like the usual figure eight. On the one hand, you need to tighten the knitting needles, and on the other, loosen them. Unlike the elimination of the usual figure eight, in the process of editing the umbrella, the effort for each next knitting needle should not be weaker, but maintain uniformity around the entire circumference.

Let’s summarize
Eights appear on the wheels of even the most experienced and savvy cyclists. In order to straighten a wheel, you need to remember a few simple rules. Always overtighten the wheel spokes. there is a risk of damage to the rim. If during straightening one or more of the knitting needles are overtightened, loosen them and the adjacent knitting needles. Only then repeat the adjustment again.

When riding a bicycle, the spokes often break, being in a state of weakening. If during the pulling procedure one or more spokes of the wheel are loosened, be sure to tighten them in order to repeat the adjustment after that.

Forceful method

Cyclists in their circle call the first method “old-fashioned” or “knee straightening”. It consists in applying brute force to the rim. Having determined the location of the figure eight, rest the rim with a curved section on the knee.

Grasping the wheel with both hands (preferably in the 10 and 2 o’clock positions), press on it. After straightening, it is worth putting it back on and turning it to troubleshoot. With the right emphasis and sufficient force, the figure eight will decrease.

This method will not help correct minor distortions. over, with a strong impact, the figure eight may appear from other sides. Therefore, the “knee” method is well suited if you are on the road and need to adjust the rim to get to the nearest workshop or your own garage.

Determination of curvature on wheels

So, there is a suspicion of the occurrence of deformation of the wheel, and it remains to determine exactly where it was formed. Turn the bike upside down and fix it clearly.

The first method of identification is visual, which allows you to find the location of large and medium defects. The wheels must be spun strongly, since at low speeds the eights, even the coarsest ones, show poorly. The rear wheel can generally be pedaled.
Curved sections move away from the plane of rotation to the side. At maximum deflection, the wheels must be quickly grasped in this place. It is not easy to do this at high speeds, and the hand can slip off, so it is better to resort to the following method.

The second method. contact, consists in marking the damaged area. As an indicator, you can take a marker, or rather a regular crayon. Spin the wheel and slowly bring the chalk to the rim. The first thing he does is strike a figure eight along the edge of the bulge. After the “top” is determined, the wheel must be spinned even more and continue to bring the chalk closer. This defines the entire area of ​​curvature. As soon as the chalk “runs” over the entire rim, the test can be considered complete. The focus of the figure eight will clearly stand out with a bold line against the background of a pale stripe along the entire circumference.

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How to fix a figure eight on a bicycle wheel

Eight definition

To accurately align the rim, you need to locate the bend correctly. This can be done in two ways:

  • Visual;
  • Using a label.

The most traditional method of troubleshooting that every young cyclist in the yard has experienced is by visual inspection of the wheel.

To do this, turn the unit upside down and turn the rim strongly. At speed, you can clearly see the curved section.

The main thing is to twist it harder. However, having identified the defect, it is necessary to accurately remember the area or to abruptly stop the wheel with your hand so as not to lose the place of curvature.

This method has its drawbacks. Chief among them is the precariousness of our eyes. They cannot always identify small eights, especially if there are more than one curved sections.

Another disadvantage is memorizing the damaged sector. Therefore, this method can be used when you do not have tools at hand or you are on the road.

The second method is more accurate. It consists in setting marks on the curved section of the wheel. But, if for visual inspection it was not required to remove the tire from the rim, then with this method of determining the defect, it is necessary to release the wheel.

With the bike turned upside down, roll the curved rim and slowly bring a chalk or marker to the back of the rim. The convex part will touch the chalk and the mark on the curved sector will be set.

Continue to slowly move the crayon towards the wheel until it traces an outline around the entire radius. This is necessary to identify less noticeable eights. The places of the outlined outline where the chalk mark becomes thicker, and there is a figure of eight.

This method of determining a malfunction requires more time and preparatory work, but thanks to it you will be able to more accurately determine even minor changes in the shape of the wheel.

Radial runout

The “egg” is when the rim of the wheel becomes oval, that is, when one part of the rim is closer to the center than the rest. The “egg” appears, as a rule, after unsuccessful landings and is much less common than the eight.

How to fix a figure eight on a bicycle, which is commonly called an “egg”? This is much more difficult to do than in the previous case.

The very first thing to do is remove the tire and make sure the rim is deformed and not the tire.

After turning the bike over, turn the wheel, while attaching an object on top. It is necessary to mark with the help of chalk that part of the rim that will lift the given object.

At the third stage, you need to simultaneously trace three directions: starting from the central spoke, release the tension; pull the knitting needles next to it by the same number of revolutions so that there are no eight; and tighten the spokes at the opposite end of the wheel to avoid the appearance of an “egg” in another place. In order to fix the figure eight, experience is required, since this process is quite complicated. It can be started over if something did not work out, first by loosening, and then pulling all the needles at the same time.

After correcting the “eggs”, just as in the example with the figure eight, you need to press on the knitting needles with all your weight. to shrink them.

Correcting the figure eight

How to fix a figure eight on a wheel? Eight in this case is when some part of the rim does not coincide with the plane of rotation.

Tools that will be needed for repair:

1) chalk, with its help we will mark the area with a defect;

3) a wheel straightening machine is desirable, but this is not necessary. The small figure eight can be removed without removing the wheels. Turn the bike upside down. in this position, you can check the correctness of the wheel relative to the brake pads.

How to fix eights on bike wheels? This process can be divided into several stages. The first step is to find the deformation. During the rotation of the wheel, it is necessary to bring the chalk closer to it. In the place where there is an eight, a trace will remain. With this simple method, you can easily determine where the deformation of the rim has occurred. At the second stage, we tighten and loosen the knitting needles, but only from a certain side. If these manipulations are performed incorrectly, you can further damage the wheel by getting a new deformation.

How to fix a figure eight on a bicycle wheel? There are several ways in which it can be removed. If it is between two knitting needles located next to each other, then using a spoke key, tighten the first knitting needle by 1/3 of a turn, and twist the knitting needle next to each other in the opposite direction, while we also loosen the clamp by 1/3.

A fairly common case is when the figure eight is located opposite one of the spokes of the wheel. Then pulling up this knitting needle should be done by ¼ of a turn, and by 1/8 of a turn, it is necessary to relax the two knitting needles located next to it. It happens that on a deformed wheel, the figure eight changes the position of several spokes located next to each other. This case is difficult, and you need to be very careful and adhere to the following rule: the knitting needles that are closer to the center should be tightened or loosened with more force, and the knitting needles located at the edge should be tightened or loosened with less force.

In order to determine the correctness of the repair, it is necessary to spin the corrected wheel, and the changes should be immediately noticeable. The actions you performed were correct if the wheel became level, otherwise you need to repeat all the actions again.

Many are wondering how to fix a figure eight on the rear wheel of a bicycle. There is no fundamental difference between fixing on the rear and front wheels.

Causes of deformation

During operation, the bike experiences stresses, and they are least dependent on how you ride. Over time, there is a process of changing the geometry of the wheel rim, that is, its deformation. How quickly it happens depends mainly on the quality of the rim.

Three defects can form on the wheel rim. These are figure eight, “umbrella” and “egg”. Let’s dwell on each of them.

How to fix eights on bicycle wheels. detailed description

How to fix eights on bicycle wheels. this question is relevant for many. A figure eight on a bicycle wheel is the most common problem with bicycle deformation. The main cause is loose knitting needles. Consider the issues of the correct tension of the knitting needles, the varieties of eights and how to fix them.

Editing “Umbrella

There is such a thing as an “umbrella”. This is when the wheel rim has moved to one side and is not perfectly aligned with the center of the hub. The amount of this offset will depend on the design of the frame itself and the type of brakes. This malfunction often occurs in the case of improper wheel assembly.

The umbrella straightens in the same way as the figure eight. On the one hand, you need to tighten the knitting needles, and on the other hand, loosen the same effort. Unlike how to straighten the figure eight, when straightening the umbrella, the effort should not fade, but should be uniform around the entire circumference.

Correct spoke tension

The driving performance of this vehicle often depends on the correct tension of the spokes. The spokes are tensioned in the direction of the tangent circumference of the sleeve with three intersections along the path from the sleeve flange to the rim. Thus, the strength and elasticity of the wheel is achieved. The needles are inserted in different ways, one from the inside, the other from the outside of the sleeve. and so on along the entire perimeter of the circle. Then the spoke is threaded into the socket of the rim, a nipple is put on it from above, and the spoke is tightened using the nipple key.

Basic Rules

So, in order to know exactly how to fix eights on bicycle wheels, you need to remember a few rules.

First, overtightening the wheel spokes can damage the rim. If in the process of straightening one or more of the spokes turn out to be overtightened, it is necessary to loosen them and the adjacent spokes, and then repeat the adjustment again.

Secondly, the spokes can break during the ride if they are severely weakened. If in the process of straightening one or several spokes of the wheel are loosened, it is necessary to tighten them, then repeat the adjustment again.

How to fix a figure eight wheel on a bicycle?

Of all the components of a bicycle, the most conservative is the spoke wheel. This type of wheel is fitted to most bikes and has a simple design: a center hub, rim and spokes that connect the rim to the pivot. During the operation of the bicycle, the wheel is subject to static, dynamic and shock loads, as a result of which changes in its shape can often occur.

Determination of curvature on wheels

So, there is a suspicion of the occurrence of deformation of the wheel, and it remains to determine exactly where it was formed. Turn the bike upside down and fix it clearly.

The first method of identification is visual, which allows you to find the location of large and medium defects. The wheels must be spun strongly, since at low speeds the eights, even the coarsest ones, show poorly. The rear wheel can generally be pedaled.
Curved sections move away from the plane of rotation to the side. At maximum deflection, the wheels must be quickly grasped in this place. It is not easy to do this at high speeds, and the hand can slip off, so it is better to resort to the following method.

The second method. contact, consists in marking the damaged area. As an indicator, you can take a marker, or rather a regular crayon. Spin the wheel and slowly bring the chalk to the rim. The first thing he does is strike a figure eight along the edge of the bulge. After the “top” is determined, the wheel must be spinned even more and continue to bring the chalk closer. This defines the entire area of ​​curvature. As soon as the chalk “runs” over the entire rim, the test can be considered complete. The focus of the figure eight will clearly stand out with a bold line against the background of a pale stripe along the entire circumference.

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Power straightening

To remove the bend in this way, you will need to remove the wheel from the frame. In this case, you do not need to remove the tire with the camera. Turn the bulge towards you and grab the rim and tire on both sides. With medium deformations, the optimal grip of the wheel is position “10” and “2”, that is, 60 degrees to both sides of the eight. We put the knee to the most convex area and press hard from ourselves.

What position of the wheel will best allow the rim to align? If there is enough strength in the leg, then you can press on the weight. An alternative is to place the wheel vertically with the defective section up. This is where the help of a partner is needed. He must firmly press the wheel to the floor. After straightening, the wheel is put on the frame and checked again by the rotation method.

This method cannot be called effective for several reasons:

  • Can’t bend small bends.
  • The rim may bend to the other side.
  • Uncomfortable.
  • Low accuracy.
  • Not every rim can be subjected to simple force so easily.

This method works relatively well somewhere on the road, when the figure eight was formed suddenly due to a swoop on a large obstacle and it must be urgently straightened in order to reach the destination.

Deformation of the “eight” type. what is it

Bicycle wheel curvature is associated with a misalignment of the rim configuration. In other words, the wheel is no longer round. A common variant is the so-called figure eight, when there is a deviation of part (or several parts) of the rim from the plane of rotation. When rotating, these areas describe trajectories in the form of eights around the central axis of rotation. When riding a bicycle, this defect is expressed in wobbling or wobbling on the go.

Riding with eights is possible, but it is unlikely to be a pleasure. In addition, deformed wheels are less resistant to stress, which will lead to further distortion and complete unsuitability of the rim. Can I fix a figure eight on a bicycle wheel myself? Yes, and it’s not difficult at all. How to do this in the article.

Elimination of defects in a bicycle wheel

When the area of ​​curvature of the wheel is found, it’s time to start straightening it. Every owner of a two-wheeled vehicle can do it with their own hands, especially since such problems can arise with enviable regularity. There are two ways to eliminate the figure eight on your own:

Wheel spoke adjustment

Attention! The spoke tension should only be changed with a spoke wrench, and never with pliers or adjustable wrenches.!

It will take patience to align a figure eight on a bicycle wheel, especially for first-timers. Tires must be completely removed.

Check the tension of all spokes first. Often times, the rim is bent due to their overall weakening. It is easy to check this: when the spokes are clearly dangling and “obeying” the fingers like strings on a guitar, then they need to be tightened by about 1 turn over the entire wheel. If such a problem is not observed, then nothing needs to be touched: this way you can only aggravate the eight.

We mark the defective area and proceed to the “central” spoke. the one located at the bulge. The turn of the spoke is carried out in the direction opposite to the direction of the bulge. The spokes on the sides of it are loosened. With a figure eight for three needles, the straightening scheme is as follows:

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  • Tightening the central quarter turn key.
  • Weakening of the outer needles by an eighth of a turn: the weakening force is half the tension in the center.

With an eight for 7 spokes, wheel repair is done as follows:

  • The center is pulled half a turn.
  • Weaken two spokes (second and third) on the sides by ¼ turn of the key.
  • 1/8 tightens the fourth and fifth needles.
  • The sixth and seventh (extreme) needles are loosened by 1/8 of a turn.

The alternation of pulling and stretching is carried out in such a way that the outer needles on the figure eight are loosened. To check the result, the wheel is hung on the bike and tested for residual curvature. If the figure eight is bent in the opposite direction, you should remove all tension and increase the tightening torque on the loose knitting needles and repeat the procedure again, but with less tightening and loosening forces.

Despite the fact that you have to tinker a lot, you can achieve the ideal result. straightening the wheel to an even circle. And if the first time the work may take too long, then with the subsequent occurrence of the eight, the repair will go much faster. Now, when a defect appears on the wheel, you can not put the bike aside, but quickly adjust the spokes yourself and resume trips.

How to fix a figure eight?

Place the bike with the wheels upside down. Bring the felt-tip pen to the wheel and spin it. In the place where there is deformation, bending, you will get a strip. Then follow the same procedure on the other side. Actually, the elimination of the eight is an alternate weakening and tightening of the spokes. We determine on which side the figure eight protrudes, and we begin to pull on the opposite side of the rim.

The tension is always produced not radially, but as if obliquely in the direction of the tangent circumference of the sleeve.

If the figure eight affects a group of several knitting needles, the repair is carried out in the same way: determine the knitting needle that is in the center of the marker line that you got. We tighten the knitting needles closer to the center of the deformation than those closer to the edges. The same procedure must be done on the other side of the rim. For example, pulling up the center spoke of a figure of eight by 1/2 turn, two adjacent ones need to be loosened by 1/4, and the subsequent ones should be tightened by 1/8. If you are doing this for the first time and you doubt that you are doing everything correctly, it is better to carefully pull the knitting needles 1/2 or 1/4 turn. After that, erase the lines, and spin the wheel again, repeating the procedure with a felt-tip pen. Proceed in this manner until complete elimination.

Sometimes it is not possible to fix the figure eight on a bicycle wheel either from the second or the third time. be patient.

Some experts advise, when completing the repair, put the wheel on the ground, support it on the hub axle and press all the weight on the spokes (a characteristic crackling is possible), for their shrinkage.

The process of repairing an egg-type rim defect

Unlike figure eight, we pull the knitting needles in the right direction on both sides! Otherwise, the repair of the ellipse will lead to the emergence of the already known figure eight. For example, if the center needle needs to be pulled up by 1/4 turn, then the next. by 1/8.

How to remove a figure eight on a bicycle wheel

Sometimes the figure eight can be seen with the naked eye, sometimes to identify it you need to carry out a simple procedure with a crayon or a marker, which is described below.

First of all, you need to understand why the figure eight is formed. Poor rim material, riding on uneven surfaces, maneuvering and hard braking, regular bumps and bad jumps, and most importantly, loose or too tight spokes.

There are several types of deformation:

  • The figure eight is the most typical deformation, when part of the rim is bent and goes out of the plane of rotation of the wheel;
  • Egg. the wheel is flattened and is not a circle, but an oval;
  • Umbrella. the rim of the wheel is not located in a plane passing exactly in the middle between the tips of the hub; at the same time the bike tends to go to the side.

To fix a figure eight on a bicycle wheel, use:

Umbrella repair

To fix the umbrella, it is better to use a special device. an umbrella meter, it reveals the symmetry or asymmetry between the sleeve and the rim. If its central screw is in contact with the axle, and the blades do not reach the rim, we tighten the spokes from this side. If, on the contrary, the blades are on the rim, and the central propeller is not in place, tighten the spokes on the other side. It must be remembered that on some bicycles the umbrella is deliberately shifted (for example, on multi-speed ones).

Of course, in order to eliminate the bends on the rim, you can turn to a professional with good quality. But eights appear regularly, and learning to correct wheel deformations on your own can save both time and money. It is not very difficult to repair a bicycle rim, and almost every experienced cyclist who has held a spoke wrench in his hands at least once will succeed.