Disassembly process of transmission cassette
Some theory beforehand. On the rear wheel there can be two variants of parts related to gear shifting.
- Transmission cassette. This product features modern and innovative spline mountings that attach to the hub axle.
- Ratchet. A somewhat outdated model, typical of inexpensive speed bikes. The set contains no more than seven gears. As for the mount, it has a thread with external installation parameters.
Immediately focus on the ratchet. Changing the rear chainring on a ratchet bike is not possible. Only change the entire component completely.
Therefore, the topic of the article will be a problem describing a situation when a bicycle cassette star needs to be replaced. As for the set of stars in the transmission, there are options up to 11 pieces, depending on the bike model.
Ratchet and cassette elements
So how do you change the rear sprocket on a speed bike? Consider the algorithm of actions.
- I took a bicycle key for the rear wheel, dismantle it. We sequentially unclench the levers and weaken the fixation of the nut.
- Now it is the turn for the axle nuts. Using the second key, we turn off the mount.
- The next stage involves unscrewing the bearings of the cone and pulling it out.
- We take out here with all the elements.
Sleeve recessing process.
- We take a special tool. a cassette remover. We insert it into the slots.
- The whip is placed on the largest sprocket. We make rotational movements clockwise.
- At the same time, using an adjustable wrench, the puller rotates in the opposite direction.
The preliminary stage is over. Such simple actions are possible in ordinary home conditions. We emphasize that if the wear is not one star, but several, then it is better to replace the entire cassette at once. This option is also desirable when the largest star is damaged.
And one more recommendation. We put all small parts, washers and nuts in a certain place, so that later you DO NOT search throughout the room
Star stripping process
How to change the rear sprocket on a bike after the first stage has already been passed.
- Removing the mount.
- Detach the cassette from the rear wheel.
- We make a thorough inspection.
- Determining Wear Sprockets.
- We remove the worn out product.
- Pay attention to the arrangement of the stars and the sequence of fasteners and washers between them.
Cassettes compare favorably with ratchets in that each worn out part can be freely removed separately.
A separate recommendation would be to replace the chain, which is also worn out, along with the sprocket.
How to replace a rear sprocket on a speed bike
There are not many key parts in a speed bike. The main ones include the stars, which serve to switch speeds with the provision of gear ratios in the transmission. With the constant operation of the bicycle mechanism, worn sprockets are formed. This is facilitated by the usual physical process. friction. What is the threat? The chain starts to jam and simply slips deformed parts.
The problem that has arisen requires an immediate solution. If the question is ignored, then any movement on the road will turn into a solid negative. The modern VELOBIKE model allows you to change a worn out part. Our article will tell you how to replace the rear sprocket on a speed or mountain bike.
Stages of installing new stars
How does assembly work when replacing a bicycle cassette chainring?
Let’s look at the steps.
- Installing a new asterisk and Fixing it.
- Assembling the cassette in reverse order.
- Using a puller, mount the drum to the slotted area.
- The drum must first be leveled.
- Next, we carry out the process of assembling the sleeve. All actions described in the first paragraph are carried out in reverse order.
- Install the rear wheel and fix it securely.
- Put on the chain.
It is imperative to check the smooth operation of the transmission. This procedure involves adjusting the rear derailleur.
If everything is done according to the proposed instructions, feel free to get on the bike and enjoy the ride.
Obviously, in order to repair a wheel, it must be removed from the bike. For this, it is better to put the latter on the handlebar and saddle, first removed the attachments. There are two ways to fix the wheel to the frame:
- Eccentrics through the hollow axis;
- With nuts or lambs.
In the first case, you just need to return the eccentric lever 180 degrees and then unscrew the nut on the opposite side of the axle. In the case of an eccentric attachment, the rear wheel of a bicycle on one side DOES NOT extend beyond the thickness of the fork in which it is installed. Experienced users must take this point into account when repairing. In the second case, the rear wheel hubs are always longer than the distance between the fork stays by at least 15-20 mm. Thus, the axle extension beyond the outer side of the fork should be no less than 5-6 mm on each side. It is important to observe these ratios when re-assembling the rear wheel hub. After the fasteners are removed or loosened, the chain must be dropped from the drive sprocket and the wheel can be removed. If the bike is equipped not with disc brakes, but with rim brakes, then most likely you will need to dissolve them, threw off the brake cable from the traction.
How to disassemble or reassemble the rear wheel of a speed bike
Removing the wheels from the frame is part of a mandatory bicycle maintenance procedure. Sooner or later, the wheel of even the most advanced bike will present surprises in the form of rim deformations, damaged spokes, burst tubes or even the entire tire, as well as wear of the sprocket system for the rear wheel.
Experienced cyclists welcome self-repair of wheels, and it is no coincidence: it is cheaper, and you will get some skills. You can also go to a good workshop, where the problem will be solved, perhaps faster, but not free of charge. Moreover, the service is hardly located under the windows of the house, so the bike will have to be dragged, which is not very pleasant. To avoid this, it is better to tinker a little yourself, especially since there is nothing complicated about the wheels. Today we’ll talk about how to remove the rear wheel from the bike, repair it and assemble it correctly.
The most common type. Particularly in the Shimano range, you will NOT encounter a knot on a “slip”. The company explains this by the fact that rolling is better in a design based on cone-nuts. Configuration elements of such a product are shown in the figure:
It may be necessary to remove the rear wheel in the following cases:
- There is damage to the rim;
- Broken tire or deflated tube;
- Complete wheel wear.
For disassembly and subsequent assembly of the rear wheel of a bicycle with your own hands, in addition to traditional open-end wrenches, you will also need special tools:
- A puller for the type of cassette that is installed on a bicycle (for example, the mechanism of cassettes of the Stealth model and HVZ road vehicles has a completely different design, therefore, suitable types of pullers are needed)
- Whip. a device for fixing a cassette, consisting of a lever with pieces of a bicycle chain attached to it;
- Spoke wrench (it is desirable that it has at least three slot sizes, which will allow you to capture even old knitting needles with a knocked down square of heads)
- Special spoons for tire bead.
Advanced BIKE can use the special repair stand to work in a natural position.
Whip puller Spoke wrench Bicycle assemblies
When to remove the rear wheel
It is unlikely that the idea of unscrewing the chassis from the bicycle frame would just come to mind, unless, of course, a person does NOT specialize in dismantling. But this is a completely different case. Dismantling the rear wheel will be required if the following problems are observed:
- Noticeable damage to the rim;
- Full wear when a wheel needs to be replaced;
- A flat tire or a blown tire;
- Bulkhead bushing.
This also includes the planned replacement of the rear sprocket and chain.
Before removing the bike, turn it over and place it on the saddle and handlebars. It is better to remove awnings in the form of a mirror, bell and lantern in advance so as not to damage them under the weight of the frame. V-brakes are first released and removed, otherwise they will not allow the wheel to be pulled out freely. With disk models, everything is easier. you can immediately remove the wheel.
I must say that the process of removal itself consists only in unscrewing the eccentric or unscrewing the fastening nuts from the axis of the bushing, who has something. If the mount is an eccentric, simply unscrew the handles and twist the wheel. The nut fastening is loosened with one or two keys.
Usually, one wrench of the appropriate size is enough, with which the nuts are removed one by one. If the bushing is turning, then the nuts are unrolled simultaneously in different directions. Open-end or box wrenches are recommended. The adjustable version is undesirable, as its thick horns “eat up” the corners of the nut due to loose fit and sliding.
Assembling and installing the rear wheel on the bike
Quality wheel repair is not only about disassembling, replacing, lubricating or adjusting. At the last stage, all this chaos must be collected in reverse order. All parts of the bushing mechanism are placed in the drum and the counter nuts are carefully secured. The drum is pushed onto the spokes, after which they must be tightened by the number of revolutions by which they were loosened.
Tightening the spoke nuts is done in the opposite direction to loosening. Here you need to remember the direction of loosening in order to tighten correctly. If the drum dangles, then you need to spin the spokes harder.
The cassette is put on the sleeve in the following order:
- Major stars;
- Single stars, small stars;
- Tightening cassette mechanism whip.
All that remains is to put the rear wheel on the frame. A chain is put on one of the stars, and the wheel is inserted into the grooves of the frame. To top it off, all that remains is to tighten the nuts or eccentrics on both sides. After assembly, you need to twist the pedals and see if the chain runs normally in the stars. Turning over the bike and begin to ride calmly!
Anyone who actively rides a bicycle will have to deal with wheel problems one way or another. Despite the ease of maintenance, the wheel can be time-consuming at first. However, if you remember how important wheels are for a bicycle, it turns out to be not so much. What’s more, with experience, a wheel bulkhead will take minutes.
How to lubricate
The ideal option is Teflon composition. For example, Finish Line Premium Grease: very Slippery and viscous. However, Teflon can be replaced with regular Litol-24 or a consistency for car CV joints.
What definitely doesn’t work is any liquid mixture:
- Bicycle maintenance compound.
- Car engine or transmission oil.
How to sort out the rear hub of a speed bike
The word “bulkhead” is fully relevant only for tapered products. The maximum that can be done in the support on the “slip” is to clean and lubricate the bearings, and do not take them out.
The repair principle for the front and rear cone nut bearings is the same, although the design differences are obvious. A set of sprockets is installed at the back; another design of the boot on the cassette side. However, the “backbone” is completely identical: in the back, in the front, on both sides, there is one cone-nut and one row of balls laid in bulk.
So, the subject of discussion is mountain bike rear cone service. It can be ratcheted like on entry-level bikes like Stels or Forward, or cassette like on mid to high price bikes. By the way, in the material, how to choose a mountain bike. We have figured out in detail the differences between THESE two designs. There is also a recommendation on which design should be preferred.
Before you start disassembling and assembling the rear wheel of a high-speed bike, you need to find a comfortable place, stock up on gloves so as not to get your hands dirty. If there is no relevant experience, you should strictly follow the sequence of actions, take into account all the subtleties. An excellent help in this matter are educational.
How to disassemble a sprocket on a bicycle?
Any cyclist who respects himself and his bike should have the skills to repair equipment. Then any situation in nature or in the city will NOT cause panic. Even if difficulties concern the bicycle sprockets.
The simplest bike consists of a whole set of parts. And the biggest of these is the frame. Its function is to provide structural rigidity. In addition, all other elements are attached to it: wheels, steering wheel, seat, etc.
The choice of the other components also depends on which frame will be chosen. For example, a model that is too heavy can overload weak sprockets.
The rudder is used to correct the direction of travel. He also influences a lot. Depending on the position of the steering wheel, it changes outside the person, which can lead to tension in the muscles or to poor posture.
The saddle provides support for the cyclist. If properly adjusted, it will allow you to enjoy the ride.
Tired wheels ensure that small bumps and bumps will NOT disturb the rider. And the transmission system will transfer the rotation from the pedals to the wheel itself. It is here that the stars are located, which many do not consider as a separate detail.
The condition of the chain and sprockets is inextricably linked. The fact is that the chain is constantly in motion, engaging this or that teeth. This leads to the fact that the wear of the two parts is quickly evened out: the ground gears spoil the chain, and the worn chain grinds down the sprockets.
Replacing the sprocket
You can often see a person typing in the search engine input line the query “bike how to remove the rear sprocket”. The reason is quite obvious: it seems that this set of parts is so complex that you will not be able to figure it out on your own. Of course, there is a rational link in such reasoning: some operations from the asterisk require some preparation. However, this is generally a fairly straightforward procedure. It is enough to perform it several times to learn how to do this operation without the slightest doubt and hesitation.
So how do you remove a sprocket from a bike? First of all, you need to remove the wheel, since the sprocket is associated with it. Therefore, the initial procedure will exactly repeat the recommendations for disassembling the wheel.
First of all, you need to turn the bike upside down. In doing so, he will rest on the handlebars and saddle. Additional devices such as a navigator or a travel computer are best removed. But the handles for controlling the brakes and gearshift can be left. You just need to put a layer of fabric under them to protect them from scratches.
Also, to how to change the sprocket on the bike (and therefore remove the wheel), you should move the brake pads. This should only be done for the rim design, as the disc circuitry of the device does NOT interfere with disassembly. The pads are first pressed towards each other, and then the arc is pulled out. Everything, the pads will now neatly disperse to the sides.
In the next step, you can begin to weaken the axis. On some models, this will require slightly unscrewing a pair of fixing nuts. You will need two wrenches: one will hold the nut, and the other will unscrew the other. If the bike is equipped with eccentrics, then the process is greatly simplified. You just need to unscrew the clamp, then return the mount several times.
After it becomes free to walk, you can remove the wheel. But before that you need to free him from the chain. It should be carefully removed from the sprockets and moved aside. By the way, if the sprockets are removed for replacement, then the chain is also recommended to be changed. After that, the wheel is gently lifted and removed from the fork.
Now you need to carefully remove the sprockets. Whip is required again. It holds the largest sprocket in the set. The puller can be turned with a wrench. There may be a fairly loud crunching sound, but you shouldn’t be intimidated. It’s just that the surfaces of the spline nut and the smaller sprocket have a grooved surface that makes a noticeable noise when turning.
After the nut is unscrewed to the end, you can remove the cassette. At the same time, special attention should be paid to washers, spacers, which sometimes come across between small diameter sprockets. They must be carefully removed and set aside until assembly. Finally, the cassette itself and the protective plastic ring are removed.
At this stage, it becomes clear: how to disassemble a sprocket on a bicycle is not difficult. It is her details that are now located next to the wheel. It remains only to check for faults and, if necessary, replace the worn sprockets.
Assembly is carried out upside-down. At the end, you will need to adjust the gearshift system and make sure that everything works fine.
Regular sprocket inspection is essential to keep your bike in good condition.