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

Determination of curvature on wheels

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

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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 vertex 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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Take the survey

There are several types of figure eight: between two knitting needles, opposite one of the knitting needles, opposite the adjacent elements.

To determine the problem, the bike should be turned over and then secured. The degree of deformation can be assessed by the following methods:

  • Visual. To determine the curvature, you need to turn the wheel quickly and at speed you can see the deformed area. Having noticed a defect, you need to remember its location or grab it with your hand. This method is not very accurate, especially if there are several damaged areas.
  • Contact. A similar technique, more precisely, it is based on marking the zone of curvature. The wheel must be freed from the tire, slowly turned. While scrolling. bring chalk or a marker to the back of the rim. He will touch the part that is curved, automatically marking the deformed place.

If a rear wheel figure eight is found, it is better to use the pedals to spin the wheel.

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 a figure 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 run into 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 a figure eight on a bicycle wheel on their own. There are several main ways. Mastering the technique will not be difficult.

Eight deformation. what is it

Bicycle wheel curvature is associated with a misconfiguration of the rim. 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.

Wheel spoke adjustment

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

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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 obey the fingers like the strings on a guitar, then they need to be tightened by about 1 turn around 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:

  • 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 knitting 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.

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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.

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 towards us with a deformed section;
  • we put our knee to the very center of the figure eight and press with force 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.

figure, bicycle, your, hands

Spoke adjustment

The method involves alternately loosening or tightening the wheel spokes using a spoke wrench. It is not recommended to tighten the knitting needles with other types of tools. Work begins with the central spoke (located at the center of curvature). Rotate it to the side that is opposite towards the bulge. Then proceed to straighten the spokes, based on the number of damaged.

Mount the wheel on the frame, check for any remaining distortion. If the defects are bent in the opposite direction, then return the tension of the spokes to its previous position, reinforce its moment again, and repeat the steps.

Attention! After the end of the procedure, be sure to check the reliability of fastening of all spokes. Otherwise, there may be accidents during the trip.

You can straighten the figure eight on a bicycle wheel with your own hands if you take a responsible approach to solving the problem. Experienced cyclists advise using the second method of repairing defects, as it is considered the most effective. If for some reason it was not possible to return the wheel to working condition, then it is better to seek help from the masters.

The figure-eight deformation is the deviation of one or more sections of the rim from the plane of rotation. As they rotate, they create a trajectory in the form of a figure eight. The cyclist feels the beating or wobbling of the vehicle during the trip. In order not to turn to the masters for help and give a significant amount of money, it is enough to learn about two effective ways to eliminate such a defect.

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:

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.

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

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

We fix the figure eight with our own hands

Cycling gives a lot of pleasant impressions and has a beneficial effect on human health. But hitting a serious bump can overshadow the trip. As in any transport, the wheels are subject to the full force of impacts and bumps on the road.

If you hit a hole or jump on any object, the rim may deform or, as they say, get an eight.

In this article we will look at methods for accurately determining the curvature, as well as how to correctly correct the figure eight.

Elimination methods

Even if there is no experience in such matters, acting carefully and following the rules, you can fix the figure eight on the wheels of a bicycle with your own hands at home. Before starting work, you need to prepare tools:

There are two methods of dressing a bicycle wheel: power and spoke tightening. Each of them has its own strengths and weaknesses.

Needle lift

The method consists in adjusting the spokes: tightening or loosening. The work to fix the figure eight on the wheel is performed using a spoke wrench:

It is not recommended to use pliers when adjusting, as they can accidentally erase the edges of the nipple.

In case of significant deformation of the wheel rim, it is better to start checking all spokes for tension. Carry out prevention: tighten or weaken the elements. Correction of the figure eight is carried out by the adjustment method:

When the repair is completed, you need to check the wheel for curvature by the contact method.

Eliminating the figure eight on a bicycle by adjusting the spokes can seem like a daunting and time-consuming process to beginners. However, this method is very accurate and will allow you to get rid of even the most difficult defects. As a result of training, the work will not take much time. It should be remembered that even the most accurate and experienced cyclists form an eight, so you need to know how to repair a wheel with your own hands.

Power method

Cyclists in their circle call the first method grandfather’s 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 on again 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 works well if you are on the go and need to adjust the rim to get to the nearest workshop or your own garage.

Power method

Among cyclists, referred to as knee straightening. The instruction is as follows:

Important! If the strength in the knee is not enough, then you can straighten the wheel in suspension. Install it with defects up, press it to the floor. Better arm yourself with the help of a partner.

After completing the work, fasten the wheel to the frame and check it again for damage. It is important to understand that it is impossible to achieve a perfect result by force. It is effective when you are at a great distance from home.

Prophylaxis

It is almost impossible to avoid the appearance of the figure eight. However, it is quite possible to postpone this moment until as late as possible. Prevention of the appearance of eights are the following factors:

  • accurate and calm driving;
  • dismount when overcoming curbs, stairs and other obstacles;
  • large wheels are better spoked with high-quality elements;
  • use double rims (important for the frequent formation of eights);
  • regular maintenance, which allows you to identify a defect at an early stage.

It is quite difficult to remove the figure eight on a bicycle on your own for the first time using the spoke adjustment method. This is a painstaking process that requires some skill. It is worth fixing 8-ku for the first time in the workshop, observing the work of a specialist, and only then you can try and fix the situation yourself.

Curvature determination methods

If you have any suspicions, all that remains is to locate the defect and then align the figure eight. To do this, you need to fix the bike in a special rack or turn it upside down and put it on the handlebars, securing it securely. There are two methods for determining:

  • Visual. Allows to detect defects of medium and large degree. You need to spin the wheel as much as possible. The fact is that even the roughest 8s can be overlooked at low rotational speeds. The rear wheel can generally be pedaled. As a rule, curved sections move away from the vertical plane of rotation to the side. Look as closely as possible and grab the spot where the wheel deflects. This is not the best way, so it makes sense to use another method.
  • Contact. It consists in the designation of a curved area with shallow. To do this, you need to spin the wheel and slowly run the chalk along the rim. First, it touches the edge of the convex area. After the tip of the iceberg has been found, it remains only to spin the wheel even more and continue to draw with chalk. This will define the entire area of ​​curvature. For convenience, it is better to highlight defective areas with a bold line.
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You can determine the figure eight using cotton swabs, a marker and tape. The sticks need to be attached in a circle to the stays of the rear fork, and then spin the wheel. The points of contact with the rim. and there are curvatures that need to be marked with a marker.

How to remove a figure eight on a bicycle wheel. reasons how to fix it

The resulting figure eight on the wheel is an annoying nuisance. Wheel wobble, wobble or runout can be felt while driving, which can ultimately lead to breakage. In order not to contact the service every time a curvature forms, it is important to know how to remove the figure eight on a bicycle wheel. There are two effective ways.

Possible types of bends

They can be divided into 2 groups: reversible and irreversible. Most often there are 3 types of reversible curvatures:

  • Eight. curvature of one of the sections of the wheel.
  • Egg. the process by which the rim takes on the shape of an oval.
  • Umbrella. the wheel deviates from the center of the fork.

Irreversible defects include dents in the rim, which can appear both in the transverse and longitudinal directions. They occur most often after a strong mechanical impact (for example, after a blow or collision). In this case, it will not work to straighten the wheel, it remains to completely change the rim, spokes, bushing, that is, to carry out complex repairs.

Eight

This defect is a deviation of one of the rim sections from the vertical plane. The result is a weakening and constriction of some of the spokes. There are several degrees:

  • Lightweight. With this defect, the rim remains intact and the spokes too. you just need to adjust their tension. The runout in this case is within 3 mm. Typical metal fatigue may be the cause. You only need to tighten the spokes properly.
  • Average. The deviation in this case is already more than 3 mm, but the spokes and rim remain intact. This defect occurs with minor impacts or collisions.
  • Strong. The defect is so serious that the rim and spokes are damaged too. In this case, it remains only to reposition the wheel, changing the damaged elements.

You can eliminate the curvature with your own hands, or you can give the bike to the workshop so that an experienced craftsman can straighten the figure eight on the wheel. Much depends on the magnitude of the problem, the tools available and the skills required.

Required tools

The most important tool for eliminating the figure eight is the spoke wrench. If there is, a bike rack will come in handy, which will allow you to securely fix the bike and calmly do work at home. If not, you can just put the bike on the steering wheel.

In any case, the spoke wrench remains the main tool. There are two types of it: milled and stamped. The first option is more preferable, since such a model has clearer edges, and the quality of its manufacture is noticeably higher.

Spoke adjustment

It comes down to alternately tightening and / or loosening the spokes. They always start with the central spoke in the figure eight, and then adjust the side elements alternately:

  • For 3 knitting needles: tighten the central one by a quarter of a turn, slightly loosen the side needles, by about 1/8 (the weakening should be 2 times less than the tension force).
  • On 7 spokes: pull the central one by 1/5, loosen the side knitting needles by a quarter of 2 and 3, tighten 4 and 5 by 1/8. Loosen the outermost (6 and 7) knitting needles by 1/8.

After that, you need to put the wheel back and evaluate the result of the work done.

It is important! After repair work, it is necessary to check how securely all the spokes are directly fixed. If this is not done, accidents may arise during the movement, which are fraught with even greater losses for the wheel.

Constant loads

The spoke tension is a static load that maintains a relatively stable wheel. This is possible due to a combination of several factors: an equal degree of tension on all spokes, the absence of cracks, deformations and signs of metal fatigue on the rim, as well as the integrity of the hub flanges.

It is interesting! A perfectly assembled wheel is capable of withstanding enormous loads, for example, 36 spokes. about 350 kg.

The pressure in the chamber is of great importance. This factor depends on the type of wheels and the model of the bike.

It is important! The wheel may emit a slight crackling sound when pulling. This is normal and does not necessarily indicate a problem.

If the spokes are stretched unevenly, then after inflating the wheel, the rim can be deformed exactly by the figure eight. Sometimes, to correct the situation, you have to re-drag the entire wheel directly.