The principle of eliminating the curvature of the “egg” rim
Above, we described what to do if the wheel is “eight” on an electric bike. Now let’s consider a more complex type of curvature of the rim. ovoid. This defect looks like a deformation of the rim to an oval state, when one section of the rim is closer to the center. Usually, this curvature is observed after falls and collisions with obstacles.
- Remove the tire. Check for rim curvature and tire damage.
- Turn the bike over. Spin the wheel by placing an arbitrary object on top of it. Mark the section of the rim that lifts the object attached to the wheel with chalk.
- Make adjustments, controlling 3 directions at once:
- reduce tension, starting from the center spoke;
- increase the tension of adjacent spokes by an identical number of revolutions to prevent bending of the “8.ki” type;
- increase the tension on the spokes on the opposite side of the wheel to avoid the occurrence of an “egg” in another area.
- Check the correctness of the repair. If the defect is not eliminated, perform all the described actions again, first loosening and then pulling all the spokes at once.
- Press down on them with full weight to ensure shrinkage.
How to straighten the figure eight on a bicycle wheel with your own hands?
To fix the figure eight you will need:
- chalk. for drawing the deformed section of the rim;
- key for knitting needles;
- if possible. a machine for straightening wheels.
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 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.
- Checking the correctness of the repair. To do this, just spin the straightened wheel and make sure that the defects are eliminated.
- Pressing the knitting needles with full weight. in order to shrink them.
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.
How to fix the “eight” on the wheel?
Eight “on a bicycle wheel is a well-known type of deformation in which a portion of the rim deviates from the plane of rotation. These defects are often caused by poor rim quality, loose spokes and aggressive riding. To less often face the problem of how to fix the figure eight on a bicycle wheel, it is recommended to tighten the spokes at least once every 3 months.
Correctly tighten the spokes in the direction of the tangent circle of the hub, crossing them three times in the interval from the hub flange to the rim. This ensures the required strength characteristics and optimal wheel elasticity. The needles are placed in a circle alternately: the 1st from the inside, the 2nd from the outside of the sleeve and with a similar alternation further. Then each spoke is led into the rim socket, supplied with a nipple at the top, and the spoke is tightened with a nipple wrench.
Correcting the curvature of the umbrella rim
Another variant of the deformation of the rim is the “umbrella”. This defect looks like a displacement of the wheel rim in an arbitrary direction and its oblique location relative to the center of the hub. The extent of this deformation depends on the design of the bike frame and the type of brakes used. The reason for the curvature of the “umbrella” rim is often errors during wheel assembly.
This defect is removed in the same way as in the figure eight: the spokes are pulled with equal effort on one side and loosened on the other. But when eliminating the “umbrella”, it is important not to reduce the effort, but to make it uniform around the entire circumference. Otherwise, the instructions for editing the “umbrella” are identical to the recommendations for eliminating the “eight”:
- Areas of deformation are determined and marked with chalk.
- The spokes are tensioned on one side and loosened on the other, with equal effort around the circumference of the rim.
- The wheel spins, and the results of the activities performed are checked. If the deformation is saved, all actions are repeated again.
- Shrinkage of the knitting needles is carried out by pressing on them with all their weight.
Recommendations for eliminating deformation of the rim
If you are interested in the question of how to remove the figure eight on the front bicycle wheel or the curvature of the rim on the rear wheel yourself, consider the following nuances. Above all, avoid over-tensioning the spokes. this could damage the rim. If some of the knitting needles are too tight during the adjustment, you need to loosen these and adjacent knitting needles and re-align.
If the spokes are too loose, they can break when rolling. These needles need to be retightened and re-adjusted. Precision and meticulousness are essential in correcting any deformation of the rim. If you rush to correct such a defect or neglect the adjustment rules, the work will have to be redone.
We bring to your attention another informative article. on how to choose the size of a bike for your height.
Deformation of the “eight” type. what is it
Bicycle wheel curvatures are associated with irregular 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.
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 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.
- 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.
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.
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:
- Strength straightening, or “knee” as cyclists say.
- Wheel Spoke Tightening and Loosening Method.
Fixed Gear Bike Race on Rare Figure 8 Track. Red Bull Mini Drome
How to fix a figure eight wheel on a bicycle?
Of all the constituent elements of a bicycle, the most conservative is the spoke wheel. This type of wheel fits on 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.
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 line up 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:
- 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 on a bicycle wheel
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 will tell you simply. 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.
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 on the 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.
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 giving in to the load 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.
Types of bends that are possible in principle:
The eight wheel tilted to the left, the dotted line shows how it should be.
The wheel is curved like an egg. The dotted line shows how it should be.
Umbrella curvature. Dotted line as it should be.
General algorithm for eliminating problems with a deformed wheel
The general algorithm is as follows. we determine 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 already 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 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. We loosen the spokes on one side of the wheel, and tighten them on the other. 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. To perfectly align the figure eight, you will have to patiently and painstakingly perform all of the above actions slowly (i.e. we twist a little).
Eight larger. to be treated in the same way as a small one.
The wheel is flattened by an egg, the straightening algorithm is slightly different. We only pull up the right side.
.Prevention of breakage and the causes of its occurrence
It doesn’t matter if the rear or front wheel is bent, it is equally dangerous not only for the bike, but also for your health. It should be understood that using a wheel with a bent rim is fraught with:
- Broken brakes on your bike.
- Wheel hub loosening.
- Prolonged use may cause the spokes to become unusable.
- Calm and tidy cross-country driving.
- Adjust the spokes on each wheel every six months.
HOW TO MAKE YOUR RIM STRAIGHT. FIXING A BENT WHEEL
You should pay attention to the fact that if you prefer an aggressive driving style and are used to passing obstacles at maximum speed, then the adjustment should be made at least once a month.
.Selection of tools and materials for home repair
The most important tool in this business is the spoke wrench, with which you can adjust the tension on the spokes on your bike. In the absence of this, you can use pliers, but in this case there is a high chance of disrupting the thread on the spoke. It is best to customize the key to the size of your bike’s spitz, rather than its universal equivalent. Also, in order to fix the figure eight on a bicycle wheel, you will need a marker or chalk to fix the places with deformation.
How to remove a figure eight on a bicycle wheel
If you prefer to actively use your bike for its intended purpose, and it does not collect dust in your pantry and garage, then you probably had to deal with the problem of wheel alignment. This problem is “trivial” for an experienced cyclist, but can put a beginner cyclist in a very difficult position. It’s good if you find a breakdown at home and can return the bike for repair. In any bicycle workshop, within a maximum of an hour, the figure eight on the bicycle wheel will be removed. The cost of this kind of services on average ranges from 50 to 200 UAH, depending on the curvature of the wheel. But if this problem arose in the field, or you often encounter it, then this article will help you fix it yourself, without anyone’s help.
Detailed, step-by-step instructions for centering the wheel on a bicycle.
Also worth mentioning is the so-called “force method” of aligning the wheel of a bicycle. In this case, place the wheel with its curved part on a flat, hard surface and press firmly on it. The main disadvantage of this approach is the high risk of ditching the wheel.