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.
The first detection method 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.
This is how the curvature of the rim is recorded.
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, we tighten the spokes from 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.
If your wheel is bent and you don’t know how to fix it, you are in the right place. I have already come across this problem and I will tell you just the repair is possible, everything is quite simple. over, I will say that the problem that you are faced with will most likely arise at an enviable frequency if you love your bike and ride it several times a week. Therefore, it is worth learning this once, so that in the future you can remove the breakdown yourself every time it occurs.
- How defects can form and why?
- What tools we may need to eliminate defects?
- How to straighten a wheel in practice and how to determine exactly where the figure eight goes on a bicycle wheel
You also need to know how to glue the bike camera. Also, be sure to read how much pressure you need to inflate the wheels of the bike here.
How to tell if your wheel is OK. Simply place the bike upside down on the saddle and handlebars with the wheels up. Spin the problematic wheel, as you think, (spin it in the sense of rotating it around the axis) and check it first by eye. If everything is in order with the wheel, then it will rotate around the axis absolutely evenly. If there is a figure eight, then it should be visible to the naked eye, or more often something like the beating of a wheel in a certain place. It is necessary to look at the wheel in profile and in face, since the bending of the wheel can occur in different directions.
Types of bends that are possible in principle:
the most common type of defects is wheel eight,
The eight wheel tilted to the left, the dotted line shows how it should be
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egg bending is also common. This is when the wheel loses its circle shape and begins to resemble an egg.,
The wheel is curved like an egg. The dotted line shows how it should be
bend type umbrella. Usually it is associated with a factory defect, it is better in this case to contact a specialist. Here I will not analyze how to fix it. Such bending is associated with uneven placement of the wheel in the grooves of the fork.
Umbrella curvature. Dotted line as it should be
How defects can form and why
There is a widespread belief that the wheel can change its shape if you do not ride carefully, when driving over bumps or during unsuccessful jumps. This is all true. That is, all this, of course, affects the rapid wear and tear. But that’s not the only reason a wheel can break. When the cyclist sits on the bike, the wheels are already loaded in the vertical direction. Further, when braking at speeds, the wheels can deform, forming eights. When maneuvering (cornering) in any direction and hard braking. In general, I think you can not explain what sloppy driving is, you yourself understand everything perfectly. So caring for your bike can put off the problem, but over time you will come back to it anyway. Even if you ride very carefully on a good road, such is the specificity of a bicycle.
Of course, everything still depends to a large extent on the wheel rim itself, on its physical characteristics. Therefore, when buying a bicycle, you need to pay the seller’s attention to such things, wondering how long the wheels can last, how they react to the deformations described above. So on cheap bicycles, the rims are correspondingly less strong. And various bends (egg and eights) of the wheels can form much earlier than on their more expensive and high-quality counterparts. In general, how the problem can arise, I think you already understood. So let’s get straight to how to solve the problem and align your wheel.
What tools we may need to fix defects So, in order to fix your wheel, you may need:
We need the spoke key to loosen and tighten the wheel spokes. I must say right away that you won’t have to tighten up much. You will gradually tighten the knitting needles and check the results immediately.
General algorithm for eliminating problems with a deformed wheel
We determine the general algorithm in which specific place the figure eight begins and where it ends (we select the lesion focus). The next step is to find the center needle in the figure eight and work with it. If our figure eight falls to the left side, select the spoke on the opposite side and pull it up to a distance of less than one turn of the spoke key. Then we take two adjacent knitting needles, these will be knitting needles on the opposite side of the previous knitting needle, weaken them by the number of revolutions a little less (for example, 2 times less) than we tightened the previous knitting needle. And so on until it is fully straightened. That is, the next two knitting needles (they will be placed on the opposite side) are already tightening even weaker than the very first knitting needle. As you move away from the central spoke (lesion focus), the number of revolutions, respectively, will also decrease gradually.
So, again, how do you fix a figure eight on a bike? To fix the wheel, we will select a section where there is an eight, and along the length of this entire section, we loosen and tighten the spokes going one after the other. On one side of the wheel we loosen the spokes, on the other we tighten. When the required operations have been completed with all the spokes, we rotate the wheel again and see the correct movement of the wheel around the axis. If it gets worse, we return the knitting needles to their previous place and make the tightening-weakening less. Thus, the skew in one direction leading to the figure eight will gradually level out. In order to perfectly align the figure eight, you will have to patiently and painstakingly perform all the above actions slowly (i.e. we tighten up a little).
The larger eight is treated in the same way as the small
The wheel is flattened by an egg, the straightening algorithm is slightly different. We only pull up the right side
An egg-on-wheel defect occurs most often due to unsuccessful landings. It flattens strictly vertically. Quite often, an egg in combination with an eight is found on the wheel. So having corrected one, do not forget to correct the other. Unlike the figure eight, an egg-type defect is treated by pulling the knitting needles on both sides. We also identify the lesion and gradually, as shown in the picture above, we need to straighten the egg by pulling the knitting needles. It will be said below, but it is necessary to ensure that all the spokes are not overtightened or, on the contrary, are too loose.
How to straighten a wheel in practice and how to determine exactly where the figure eight of a bicycle wheel goes
How to determine exactly where the eight passes. Masters who have gotten their hands on in this matter can fix the problem without improvised means (crayon and other things). You will have to edit the wheel first using a crayon. We spin (rotate) the wheel and gradually bring the chalk to the rim of the wheel rotating in the axle. In those places where there is an eight, the chalk will touch the rim and scribble serifs on it. So you define an eight for yourself.
I saw another great option on how to straighten a figure eight on a bicycle wheel in one video. We take ear sticks. On both sides of the wheel we have front fork stays. We attach ear sticks to these feathers on the scotch tape from both sides and, just like with a crayon, rotating the wheel, gradually bring the ear sticks to the wheel rim and mark the places where they begin to clearly touch the rim with chalk. Quite a convenient option, since it can be quite problematic to hold the chalk on the weight. If your wheel is flattened like an egg, that is, it has lost its perfectly round shape, we do everything the same as for the figure eight, only we just bring the chalk from the outside of the rim where the tire with the camera should be.
As you can see from the above, eliminating the figure eight on a bicycle is not a very difficult process, and the best part is available to everyone. The only thing I want to add is that when you have done all the work on aligning the figure eight on the bike, be sure to check all the other spokes. What shouldn’t be? The spokes should not be loose or overtightened. Freely dangling spokes can break, so carefully tighten them and repeat the wheel adjustment again. If the spokes are too tight they can pierce the pin or wheel rim. Craftsmen advise if you have tuned the wheel and everything suits you, but some spokes stick out from the wheel rim, you can sharpen them, for example, with a file, so as not to pierce the camera.
As a result, I would like to say that it is better to learn how to do all this yourself once than to go to the workshop every time. Personally, I remember the workshops as would-be masters who do not have time to serve everyone, so they do everything in haste. And you are the owner of the bike and you can do everything unhurriedly, unhurriedly, literally and accurately. So go ahead and buy spoke wrenches and fix your bike wheels!
All of the above may require special cycling tools from you.
Pedals on the bike find out the reason here.
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 the repair:
1) chalk, with its help we will mark the area with a defect;
Wheel dish tool. make your own
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.
Quite common is the case 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 it. 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.
How to straighten a figure eight on a bicycle wheel with your own hands?
- chalk. for drawing the deformed section of the rim;
- key for knitting needles;
- if possible. a machine for straightening wheels.
How To Straighten A Wheel | MTB Maintenance
Minor deformation is eliminated without removing the wheel. You need to turn the bike over and check the position of the wheels in relation to the brake pads. The algorithm of actions when solving the problem of how to fix an eight on the wheel of an electric bike or ordinary bicycle includes the following steps:
- Search for deformed areas. To identify the curved places of the rim, it is enough to bring the chalk closer to the rotating wheel. a trace will remain in problem areas.
- Tightening and loosening the needles in the required places:
- in the presence of deformation between 2 adjacent knitting needles, it is enough to tighten the 1st knitting needle by a third of a turn, and twist the adjacent one in the opposite direction, loosening the clamp also by a third of a turn;
- when identifying a “eight” opposite any spoke, it is recommended to tighten it by ¼ of a turn, and loosen the pair of spokes closest to it by 1/8;
- in case of deformation in the shape of a “figure of eight”, which changes the position of a row of adjacent spokes, it is necessary to change the tension of those that are closer to the center, and to a lesser extent to change the tension of the spokes at the edges.
If the problem persists, it means that the repair was performed incorrectly, and you will have to repeat the entire rim straightening algorithm again. As for the question of how to straighten the “eight” on the rear wheel of a bicycle, the principle of wheel alignment is identical and practically does not depend on their location.
Causes of deformation of the “eight” type
When creating modern bikes, manufacturers use the latest technologies, but the design of the discs still remains outdated, spoke. Small curvatures do not lead to tangible troubles when driving, they can be tolerated for a long time. Ordinary deviations can lead to dangerous situations, such a malfunction must be eliminated.
There is an opinion that the “eight” on a bicycle is a consequence of active and careless riding. Driving over bumps, uneven surfaces, unsuccessful jumps, dashing turns lead to deformation. These factors inevitably affect the geometry of the rim, but they are not the only reasons for the formation of the “figure eight”. During operation, the driving style has the least effect on the appearance of distortions.
The vertically directed load occurs already when you get on the bike. Abrupt braking at speed leads to deformation, the “figure eight” begins to form. Biking and cornering at high incline speeds only exacerbate the problem.
This is especially true for those who like jumping on a bicycle. Not all bike models are equipped with special shock absorbers that partially compensate for the load upon landing. The jump irreversibly changes the geometry of the wheel of the bicycle, it is not easy to eliminate such a defect.
Careless driving cannot explain all the reasons for the emergence of the “eight”. Even if you ride very carefully on a perfectly smooth road, deformation will be observed over time. this is a characteristic feature of bicycle operation. The more kilometers traveled, the more often there will be a need to adjust the wheels of your bike.
A high-quality rim, made technologically correct, significantly reduces the possibility of forming a “figure eight”. On cheap models of bicycles, defects may already be present at the time of purchase, respectively, repairs will need to be done almost immediately after the start of operation. On a poor quality rim, curvature develops after the first few rides.