How to fix eight on bicycle wheels - detailed description

How to fix the eight on the wheels of a bicycle - this question is hard for many. Eight on the wheel of a bicycle is the most common problem of its deformation. Its main cause is loose knitting needles. Let's consider questions of correctness of a tension of spokes, versions of eights and ways of their correction. It should immediately be said: for preventive purposes, to not too often wonder how to fix the eight on the bicycle wheels, you need at least once a season to tighten the knitting needles.

Correct tension of the spokes

From the correctness of the tension of the spokes often depend on the driving qualities of this vehicle. The tension of the spokes is made in the direction of the tangent circumference of the sleeve with three crossings along the path from the flange of the sleeve to the rim. Thus, the strength and elasticity of the wheel is achieved. The spokes are inserted differently, one from the inside, the other from the outside of the bushing - and so along the entire perimeter of the circle. Then the needle goes into the nest of the rim, the nipple is put on top of it, and the pin is tightened with the help of a nipple key.

Causes of deformation

During operation, the bike experiences loads, and they are least dependent on how you drive. Over time, there is a process of changing the geometry of the wheel rim, that is, its deformation. How quickly it happens will largely depend on the quality of the rim.

Three defects can form on the rim of the wheel. This is a figure eight, an umbrella and an egg. Let us dwell in detail on each of them.

Correcting the eight

How to fix the eight on the wheel? The 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 wake up to mark the site with a defect;

2) spanner key;

3) it is desirable to straighten the wheels, but this is not necessary. Eight small size can be removed without removing the wheels. We turn the bicycle with the wheels upwards - in this position it is possible to check the correctness of the wheel relative to the brake pads.

How to fix eight on bicycle wheels? This process can be divided into several stages. At the first stage, it is necessary to find a 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, there will be a trace. With this simple method, you can easily determine where the deformation of the rim occurred. At the second stage, we pull up and loosen the knitting needles, but only on a certain side. If these manipulations are not performed correctly, you can further damage the wheel by getting a new deformation.

How to fix an eight on a wheel of a bicycle? There are several ways in which it can be removed. If it is between two spokes located next to each other, then using a spoke key, tighten the first spoke by 1/3 turn, and the spoke near it is twisted in the opposite direction, and the clip is also weakened by 1/3.

Quite common is the case when the figure-eight is opposite one of the spokes of the wheel. Then pulling this knitting need to be done at ¼ turn, and 1/8 turn it is necessary to relax the two spokes next to it. It happens that on the deformed wheel, the eight changes the position of several spokes next to each other. This case is complicated, and you need to be very careful and follow the next rule: the knitting needles that are closer to the center need to be tightened or loosened more strongly, and the spokes on the edge need to be tightened or loosened with less force.

In order to determine the correctness of the repair, it is necessary to untwist the corrected wheel, and the changes must immediately be noticeable. The actions you performed were true if the wheel was flat, otherwise it's necessary to repeat all the actions again.

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

Radial runout

"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 others. "Egg" appears, as a rule, after unsuccessful landings and meets much less often than the eight.

How to fix the eight on a bicycle, which in ordinary usage is called an "egg"? To do this is much more difficult than in the previous case.

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

2. Turn the bicycle over, spin the wheel, attaching any object to it. It is necessary to note with the help of chalk that part of the rim that will lift this object.

3. In the third stage, you must simultaneously track three directions: starting from the center knitting needle, loosen tension; Pull the spokes next to it, for the same number of revolutions, so that there is no figure eight; And the spokes located at the opposite end of the wheel, pull to exclude the appearance of the "egg" in another place. In order to correct the figure-eight, you need experience, since this process is rather complicated. You can start again, if something does not work out, first loosening, and then pulling all the knitting needles at the same time.

4. After correcting the "egg" in the same way as in the example with the figure-eight, you need to press the spokes with all the weight - to shrink them.

Edit "Umbrella"

There is such a thing as "umbrella". This is when the rim of the wheel has shifted to one side and is not perfectly aligned with the center of the bushing. The value of this offset will depend on the design of the frame itself and the type of brakes. This fault often occurs when the wheel assembly is not assembled correctly.

The umbrella is straightened just like the eight. On the one hand, you need to tighten the knitting needles, and on the other, to relax on the same effort. In contrast to how to straighten the figure-eight, when adjusting the umbrella, the force should not be attenuated, but must be uniform throughout the circumference.

Fundamental rules

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

First, pulling the spokes of the wheel, you can damage the rim. If during the straightening process one or more of the spokes are stretched, it is necessary to loosen them and adjacent spokes, after which the adjustment should be repeated once more.

Secondly, in the process of driving, knitting needles can break if they are severely weakened. If during the straightening process one or more spokes of the wheel are loosened, it is necessary to tighten them, after that repeat the adjustment again.