- Central tightens 1/2 turn.
- The side needles from it are loosened by 1/4 turn.
- The following needles are tightened 1/8 of a turn.
- The outer needles are loosened by 1/8 of a turn.
Please note that only painstaking and gradual work in several stages will help to repair the figure eight on a bicycle and restore it for a convenient and comfortable ride.
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 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.
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.
Eliminating a wheel defect known as an egg
The egg defect appears due to strong point overloads, usually caused by a failed landing. A wheel with such a defect loses its circular shape, taking on an elliptical shape that looks like an egg, hence its name.
The process of removing an egg on a wheel begins by identifying the affected area. The method of determining is similar to the process of determining the figure of eight. The difference is that the chalk must be brought up to the wheel rim from the side where the tire is. In this case, of course, the tire must be removed. The tool used here is the same as for aligning a figure eight on a bicycle wheel.
The egg defect is eliminated according to the same principle as the eight, with the only difference that when correcting the egg, we will only tighten the knitting needles.
We start, as in the case of correcting the eight, from the central knitting needles in the identified area of the egg, here we tighten more, gradually decreasing the distance by which we turn the spoke key, as we approach the edges of the egg area.
Often, two defects can be present at the same time, therefore, having removed the egg, do not forget to eliminate the figure eight.
How to identify curvature?
Before you get started and start fixing the figure eight, you need to determine the type of malfunction and its location. Algorithm for performing the work:
How to remove Pinhead locking bike wheel skewers if you lost your key
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.
Types of bends that are possible in principle:
- the most common type of defects is a wheel eight;
- egg bending is also common. This is when the wheel loses its circle shape and begins to resemble an egg in shape;
- 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. This bending is due to the uneven placement of the wheel in the grooves of the fork.
Bicycle front wheel design
Before proceeding directly to the removal and disassembly of the front wheel of the bike, which is responsible for the trajectory of the bike, you should know what parts the structure consists of. The wheel is perhaps the main element of the bike, which has undergone some modifications least of all. Naturally, today you can buy bicycles equipped with alloy wheels, all-round wheels (for driving on a track). However, in general, regular bikes, speed bikes, or other models have traditional spoked wheels.
The front wheel is structurally simpler than the rear one and consists of the following parts:
- knitting needles;
- flipper. a rubber band (gasket) on the inner side of the rim, which protects the chamber from being punctured by the needles;
- tire and tube;
- disc if the bike is equipped with disc brakes.
Having dealt with the device, we proceed to the next stage.
Removing the front wheel from the bicycle fork
Before disassembling a bicycle wheel, it must be removed from the fork of the bike. To do this, we take the following steps:
- Turning the bike upside down.
- Release the brake on the rim. Remove the caliper (caliper brake) from the disc.
- On the fork dropouts, loosen the clamps.
- Remove the wheel axle from the fork.
Attention! Dropouts can be nut or eccentric. The first option will require 2 15 mm wrenches (one as a lock, the other is twisting). The second option is simpler. we twist the nut and snap off the clamping mechanism.
How to disassemble and assemble a bicycle wheel
To carry out repair and maintenance work on a bicycle wheel, it is necessary to remove and disassemble this element of the bike’s structure. In order not to address this problem to specialized services or to private traders (why pay if it is possible to do everything with our own hands), we will figure out how to disassemble a bicycle wheel in order to get to the desired unit and carry out repairs or maintenance. It is easy to carry out this process with certain knowledge in the baggage. You can verify this by reading the instruction article.
Attention! Disassembly of the driven (front) wheel of a bicycle is required to repair or prevent the hub, replace a tire or tube, tighten or loosen the spokes.
Disassembling a bicycle wheel for troubleshooting
Camera puncture is the most common problem cyclists face. To remove the tire to replace the inner tube, do the following:
- Remove the wheel from the bike fork as described above.
- We release the remaining air from the chamber.
- After removing the cap from the nipple, push it a little inside the rim.
- On the opposite side, with two plastic assemblies, you need to pick up the tire bead.
- Hold the bead of the tire with one more fitting until it comes off the rim.
- We take out the camera.
Having glued the puncture or taking a spare whole camera, we assemble the tire according to the following scheme:
- Slightly inflate the camera to straighten it.
- Putting the camera on the tire.
- Looking at the arrows, select the correct direction of the tire and pass the nipple through the hole in the rim.
- Install the tire beads in place. in the rim. The action is carried out from the nipple. Using monitors will simplify the procedure.
- We pull out the nipple tube and check that the beads of the tire are tightly joined to the rim.
- Putting the wheel on the bike fork.
Attention! Serious repairs. broken spokes, cracks in the bushing, and the like. will require specialist intervention. These problems cannot be eliminated with your own hands.
A loose bicycle wheel, backlash visible to the naked eye, difficult rotation, squeak are symptoms that speak volumes about the time to inspect the hub. Disassembling the hub is somewhat more difficult than skirting the wheel, but it is also feasible directly by the cyclist himself according to the following scheme:
- Dismantling the axle from the dropouts.
- Using two 17 mm wrenches, loosen the nut that secures the sleeve. We fix the right nut, and twist the left one counterclockwise.
- Having hooked up with a 14 mm wrench, unscrew the cone with our hands.
- Carefully remove the axle from the opposite side. We take out the left bearing from the housing, and remove the right one from the cone.
Next, we carry out inspection and lubrication of parts, cleaning the case from dirt and dust. Then we assemble the wheel:
- Install the right bearing on the cone with the same side.
- We place the axis in the bushing and install the left bearing.
- We screw in the cone so that the surface only touches the bearing, but does not fix it.
- We fix the sleeve with a nut.
- Putting the wheel back on the dropouts and securing it.
The light and soundless rotation of the bicycle wheel after its energetic spin indicates that everything has been done correctly. It is necessary to center the front wheel of the bike by twisting or loosening the cone if the bushing moves along the axis or there is difficult rotation.