Bicycle brake rotor
The brake disc (rotor) can be of the following sizes: 140, 160, 180, 185, 203, 220 mm. Which one to choose? This is the question most cyclists face, consider how and what the rotor size affects.
In a nutshell, the larger the rotor, the more effective the brake, this is due to the fact that the larger the rotor, the larger the lever arm of the braking force. Everything is easy and simple. In most cases, 160 and 180 mm rotor is used for non-extreme riding. For more extreme or powerful braking use 203 and 220 mm rotor.
V-brakes are usually found on budget bike models. Not all frames can be fitted with these brakes due to the lack of pivots for installing this type of brake. It is advisable to use rim brakes when cycling calmly. They are not whimsical to maintain, quite lightweight and cheap in comparison with disc brakes.
Mechanical disc brakes have good braking performance, so it is advisable to use them if you are riding at a more aggressive pace and with limited funds. expensive than rim brakes, but cheaper than hydraulic brakes. The Avid BB-5 and BB-7 disc brakes have been particularly popular in recent years. Hydraulic disc brakes are only needed when high braking power is important, which is why it is used in extreme conditions (for example, downhill. downhill). They need periodic oil changes, the hydraulic lines require careful handling, as they can be damaged if dropped, which will entail additional costs.
When buying their hydraulic type, it is necessary to clarify in advance where you can purchase spare parts for it, so that in the event of a failure of a part, you do not have to change the entire set.
Hydraulics should be chosen only by those who drive over rough terrain and love extreme sports. Otherwise, don’t waste your money. Buy mechanical or hybrids that are optimal for cycling and city riding. Their reliability and ease of use will not make you regret your choice.
When buying disc brakes, pay attention to the size of the rotor, which directly affects the braking efficiency. The larger its diameter, the better the response.
The smoothness of the brake depends on the brake pads. Depending on the content, they are organic and mechanical. The latter type contains metal filings. Because of this, they are more wear-resistant, but take a long time to fit for better performance. Their organic counterparts provide gentle braking and rub in almost immediately due to their softness.
If you need to choose powerful brakes, then you should pay attention to the markings. The presence of the abbreviations AM, FR, Trail and DH in it means that you can rely on them. They will provide powerful braking in any situation.
From the above, it follows that mechanical disc brakes are the “golden mean” and are the best choice for any cyclist.
Disc brake types:
- mechanical (the basic principle of operation of the brakes using a cable, which is placed in the shirt);
- hydraulic (the basic principle of the brakes is with the help of brake fluid or mineral oil, which is in the hydraulic line).
Causes of extraneous sounds of disc brakes
Quite often cyclists are faced with the problem of squeaking disc brakes. Many immediately go to the bike workshop to fix the problem. You can diagnose yourself and decide what this may be due to:
- The most common reason is the basis from which the pads are made, namely cheap and low-quality material. It is important to immediately replace the pads with brand new ones as they can damage the rotor surface. However, do not immediately sin on the pads, as the pads may not be compatible with your brakes.
- A squeak can occur with new pads that have not yet got used. This is because there is an impurity layer on the surface of the pad that causes an unpleasant sound. You need to wait a few days and wait until the pads are rubbed. If the problem persists, then it is necessary to replace the pads with others.
- When the pads are worn out, the metal plate begins to come into contact with the rotor. Replacement of pads required.
- Read everything you want to know about bicycle braking systems in this article.
- Find out why the roller brake has the perfect modulation and who is best for you
Advantages of hydraulic over other types of disc brakes
The differences between them are related to their design features. The indisputable advantage is the speed of response to the pressing of the handle, clarity of operation and reliability. They compress the pads harder. In mechanical counterparts, the cable stretches if you press the brake lever with force. And in hydraulic fluids it is not compressed. Except when it boils in the system.
Hydraulic bicycle brakes eliminate friction in their parts thanks to the lubricant. They do not have backlash, which often occurs when using their mechanical counterparts.
You can adjust the braking force and dose it. The pads retrace faster when the brake lever is pressed. These brakes are very responsive. In mechanical models, the cable rubs on the shirt when moving. Whereas in hydraulic oil it mixes through the system without much resistance. At the same time, it allows the cyclist to brake by pressing the handle with only one finger. Therefore, these brakes feel better and respond more clearly. They are installed on all powerful bike models.
Prolonged use of mechanical brakes will result in shoe wear or cable wear. Hydraulic counterparts completely eliminate this. The main thing is to avoid kinking the tube containing the brake fluid. Otherwise, you can lose the brakes. With the exception of this and even the complexity of repairing hydraulics, the most reliable version of disc brakes is still the most reliable.
If there is a fluid leak from the hydraulics, then the possibility of braking will still remain, albeit for a short period. In mechanical analogs, a rupture of the cable is accompanied by an instantaneous failure of the entire system.
- Read everything you want to know about bicycle braking systems in this article.
- Find out why the roller brake is ideally modulated and who is best for you
Advantages and Disadvantages of Disc Brakes.
Here are the obvious differences between disc and rim counterparts. Let’s highlight their advantages over the last type of brakes and point out the disadvantages.
The positive characteristics include:
- are durable;
- you can ride with them in any weather, because they are not clogged with snow and mud;
- provide a high coefficient of friction between the metal disc and the abrasive in comparison with the mechanical indicator (pad and aluminum rim);
- works faster and withstands downhill slopes;
- the rim and wheels practically do not wear out;
- his discs are not afraid of strong heating and sudden braking;
- one adjustment is enough for the entire period of operation;
- if the bike is damaged, it will not affect their work.
There are some negative points, these include:
- installation and maintenance will require special tools;
- some models differ in perceptible weight, and because of it there is a load on the hub and spokes of the bicycle;
- high price;
- difficulties may arise when replacing brake pads;
- often get in the way when installing a bike rack.
Today, hydraulics are considered the best type of disc brakes. The above positive aspects mostly concerned her. and more riders, taking care of their safety and comfort, install this system on their bikes.
Disc brake service
In order for braking to be always effective, it is necessary to monitor the condition of the brake as a whole, namely:
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- Watch the stretch in the cable. When you press the handle, the cable should work clearly and smoothly and take the pads to the end.
- Monitor the condition of the pads by periodically removing them. For better access to the pad, it is better to remove the wheel and remove the pads from the brake machine, and assess their condition.
- Inspection of the rotor and cleaning from the accumulated plaque from the pads. Take a small piece of sandpaper and sand the brake surface of the disc.
- Brake system: calipers, hydraulic lines, brake levers. Repair and service
- What to do if disc brakes squeak on a bicycle? Discover.
- Repair, adjustment and adjustment of brakes on a bicycle with your own hands. www.velosipedinfo.ru/regulirovka-tormozov-na-velosipede-svoimi-rukami
How to ride a bike on the road?
In winter, the braking distance is about twice as long, so you need to maintain a distance behind the car. It is advisable to stay away from large vehicles, as they block most of the road and the cyclist has less visibility.
Is it worth it to decide on a bike in general to go for a walk in winter?
You just need to be confident in the bike and in yourself. The bike must work flawlessly, all its mechanisms must be in good working order. So that the tread has maximum grip. If you have bald tires, you can lower the pressure a little for better grip. And to be confident means to be able to show the rules of turns on the road, that is, to be able to ride a bicycle with one hand.
“No” to headphones while driving along a busy roadway
How to prepare your bike for winter?
It is advisable to put on a protector. winter tires with spikes and hang fenders so that snow and dirt do not stain clothes and shoes.
How to enter a bend?
It is necessary to keep the bike as level as possible and not to overwhelm.
How to dress for cycling?
It is advisable to wear more athletic clothing. Thermal underwear and a windbreaker are required so as not to blow.
It is important to keep your knees warm. If your knees freeze, special lubricant will freeze there, and this is the risk of injury.
Now buffs are in vogue, but I do not recommend covering your face with their help, because condensation collects there and it is uncomfortable to ride with a wet rag on your face. Therefore, it is best to leave your nose and mouth open.
You also need glasses, otherwise your eyes will start to water or something will get there. Do not forget that you need to be noticeable on the road. wear bright vests, jackets, flashers and the like.
How to ride a bike safely in winter. wear warm, breathable and bright equipment
Where you can’t ride a bike in winter?
In winter, avoid driving over ice edges, paving stones, tiles, marble and dividing lines. The bike then simply flies out from under the cyclist, like a knocked out stool. You can drive along the cleared road.
Is it possible to ride summer tires in winter?
It is possible, but summer tires become “oak” in winter. It is more difficult to ride on ice. Winter tires are softer, do not tan and have better characteristics. In addition, it has spikes and is not scary to ride on ice.
Also in winter, wheel width is important. The wider it is, the safer.
How to assemble a bike out of the box
Buying a new bike is always accompanied by great joy and anxious anticipation of the first ride.
Perhaps, at first glance, this procedure will seem complicated and impracticable. But, after carefully reading this article, you can easily assemble and configure the bike yourself. This skill will be useful to you in the future, when the question of emergency repairs arises away from home.
- Hexagon set (multitool);
- Open-end wrench 15;
- Auxiliary tools (wire cutters, stationery knife).
Advice: choose a high-quality multitool with a large number of all kinds of keys! Thus, with a single tool, it will be possible to set up and repair any part of the bike. Another significant advantage of the multitool will be the presence of a squeeze for the chain.!
So, the box with the bike is in front of you, all the necessary tools are at hand. it’s time to start assembling!
If you can ask familiar cyclists for a special rack-bracket on which you can place your bike, this will be an additional convenience during assembly. In case of her absence, just use the help of friends or relatives.
First of all, you need to inflate the wheels according to the recommended pressure. Select an average between the upper and lower pressure thresholds printed on the tire. With some experience, you yourself can easily determine the degree of pumping, depending on the complexity of the relief. In rare cases, if the bike is equipped with disc brakes, the brake rotors need to be screwed onto the wheels. They are attached with six special bolts that come with the bike.
Tip: A quality telescopic bicycle pump is lightweight and compact. It can be easily positioned on the frame using a special mount. Better to give preference to a pump with a pressure gauge. This way you can more accurately regulate the pressure in the tires, thereby extending their service life.
You need to start assembling the bike by installing the handlebar. To do this, you need to unscrew the stem cover, which is fastened with four bolts. Next, we insert the steering wheel into the stem, center it using the applied marks and press it with the lid. The stem bolts should be cross-tightened without excessive force. At the same time, you need to check how the stem bolts are tightened, with which it is attached to the fork stem. Tighten them if necessary.
An important point is the position of the brake levers on the steering wheel. They should be placed in such a way as to continue the position of the palms, without the need to bend them in the wrist.!
Depending on the level of the bike, the wheels can be attached to the frame using special eccentrics or nuts. In the first case, the installation procedure is done manually without a tool, and in the second, you will need an open-end wrench for 15.
To install the rear wheel, you need to pull the rear derailleur back, overcoming the force of the spring and inserting the wheel into special slots in the frame (dropouts). After making sure that the axle of the wheel lies flat in the frame, insert the eccentric into its hole, pressing the adjusting nut by hand and close the lever, thereby rigidly fixing the wheel. The pressing force of the eccentric lock or the tightening of the nut is calculated intuitively. It should not be excessive, so as not to damage components, but also not very weak, so that the wheel does not fall out while driving. This procedure is carried out in the same way for the front wheel. It is also necessary for Honor that the eccentric lever should be on the left side in the direction of the bicycle and in the closed position should look up.
The next step is to install the front and rear brake calipers (the device into which the brake pads are inserted) onto the frame and fork. The fastening of these elements can be carried out in two ways. directly or using special adapters that come with the kit. In the second case, we first install them, and only then we fasten the caliper. To perform this procedure, you will need a 5mm Allen key and four matching bolts (included). After that, you can fix on the frame all shirts of cables or brake lines, which fit into special grooves and are attached using ordinary plastic ties.
Tip: When installing the calipers, be sure to align them with the brake rotors. This will eliminate the possibility of friction between the pads and the rotor, thereby ensuring free rotation of the wheels. To perform this procedure, you need to slightly loosen the mounting bolts and press the brake lever several times, holding it after the last pressing. Without releasing the brake, tighten the bolts and check the ease of rotation of the wheel. If friction is present, then the manipulations must be repeated to obtain the desired result.
There is only a little left! Installing the saddle and pedals 🙂
Install the saddle so that it is strictly parallel to the ground, and its nose looks along the top tube of the frame, without deviation to the left or right.
When driving for the first time, it is very important to set the correct height and position.
To do this, use the following guidelines:
- In a sitting position, an almost fully extended leg should reach the pedal with the heel;
- With the connecting rod parallel to the ground, the bent knee should be in one line with the pedal axis, strictly perpendicular to the ground. This adjustment is done by moving the saddle forward or backward.
These tips will help you pedaling as efficiently as possible, while reducing overall fatigue, as well as eliminating the risk of knee injury while riding.
The pedals are set using a 15 open-end wrench. Note that the pedals are labeled R and L (left and right). This is how they should be installed on the connecting rods. The left pedal is screwed into the crank arm counterclockwise, and the right pedal clockwise. Often, after buying a new bike, it becomes necessary to adjust the rear and front derailleur. To do this, you can use a special article on our website. Once again, carefully inspect the bike, checking each installed component and if everything is ok. feel free to go on your first ride.!
What tools do you need to have?
It’s hard to answer this seemingly simple question right off the bat. To do this, you need to look at the type of hardware used (in case we are dealing with bolted fasteners) or screw drives of clamps (for quick-release fasteners). This may require:
- Medium flat or Phillips screwdriver
- wrenches (6mm, 8mm, 10mm);
- internal hexagons or squares (4mm, 6mm);
- appropriate threaded hardware (screws, bolts, screws. look at the standard screw holes in the bicycle frame).
As a rule, in such a simple matter, you can always get by with an “emergency” set of tools that is “carried” with a bicycle. If, of course, it is available.
How to install fenders on a bike
What bicycle fenders are there?
Everyone should know such elementary and fundamental data. By the nature of the fastening, bicycle mud guards are:
- with screw fastening in the frame (they are still unfairly called “stationary”). such protective wings are usually full-size (but there are also shortened versions). This type of bicycle wing is practiced on the vast majority of types of bicycles. These include classic road bikes, city bikes, tourist tourers, pleasure cruisers, sports bike hybrids, and even racing highways. Threaded holes for fastening “stationary” shields can also be found in mountain bike frames (MTB).
- with quick-release attachment to frame pipes. this kind of mudguards are most often practiced on only one type of bicycle. sports mountain bikes, sometimes. on bicycle hybrids. But since these types of bicycles are incredibly popular among many categories of cyclists, such wings are very popular and in demand.
Fitting Full Size (Short) Bolt-on Bike Wings
As a rule, full-size bicycle fenders equipped with additional side rods have three attachment points. one central, in the frame, two lateral. at the ends of the wheel axles or on the tubes of the rear stays. But there are also simplified (shortened) options, with only one bolt in the frame.
To mount such a “three-point” full-size bike wing with side rods, you will need:
- determine which flap is installed, front or rear (they differ slightly in size and fasteners);
- place the guard over the corresponding wheel (front, rear) so that the side links are on opposite sides of the bicycle wheel;
- align the hole in the wing with the corresponding threaded hole in the frame, screw the shield with threaded hardware (screw, bolt) to the bike frame;
- unscrew the side nuts securing the wheel axles, put on the wheel axles the eyelets of the side links of the mudguard, put the nuts in place and tighten them until they stop. If the side rods of the shield are attached with clamps to the feather tubes, then. hook these clamps onto the pipes and tighten the fasteners of the clamps.
Reasons for raising the question
How do I fit or attach a mudguard or mudguard to my bike? For an experienced cyclist, the question seems too simple, not worth the detailed explanation. But only experienced cyclists are not limited to cyclists. There are also beginners, inexperienced, ultimately technically illiterate cyclists. Accordingly, such a question has a right to exist. If an inexperienced cyclist types in an Internet search engine a query like “how to attach fenders, attach the fenders to a bicycle”, he should find an exhaustive answer to it. We will help him with this.
Installation of quick-detachable fenders on mountain MTV
In this case, the technology for mounting the front and rear flaps is somewhat different.
In order to install the front quick-release flap, it is necessary to insert its mount from below into the steering tube glass, and tighten (screw) the spacer screw to the stop. Then put the shield itself under the plug, insert it into the fastening groove, press it down until it clicks. that’s it, the shield is installed.
The rear quick-release wing simply attaches its clamp to the seat tube. Further, the adjusting mechanism sets the required mud gap between the flap and the wheel protector. and that’s it, the installation is complete!
How to Install Brake Cables & Housing | Bicycle Repair
Tips for installing disc brakes on your bike
In any transport, including two-wheeled ones, brakes are considered the main element, since human life largely depends on them. This is why it is so important to properly install and maintain disc brakes on your bike. Their idea is simple: the pads are pressed by a primitive device to a steel disc, which is attached to the left of the wheel hub.
The braking efficiency depends on the force with which they are pressed. The designers are looking for a material for the pads that provides reliable braking, but does not quickly wear out the aluminum rim. Abrasive pads, for example, make it unusable very quickly. The steel disc works for years without replacement and adjustment.
Disc brakes are distinguished:
Hydraulic ones consist of a control cylinder located in the brake handle, a power cylinder piston (or two), which is responsible for the operation of the pads. It powers them thanks to the oil inside the high-strength sleeve that connects the cylinder to the pads.
Mechanical structurally is the following: a simple mechanism, controlled by a cable, presses the pads against the disc. It does not differ in variety and is represented by a wedge and a cam or a running screw, similar to that which is put in a water tap an axle box, which is a relative of a wedge. But it rotates around the axis, and the wedge moves along it. The movement of the shoes and the cable occurs in directions perpendicular to each other.
Hybrids, of course, successfully combine hydraulics with mechanics. The cable through the lever acts on the hydraulics located in the brake housing. It is made up of two cylinders, between which there is a little oil. the control and the power.
Why disc brakes are attractive:
- there is a higher coefficient of friction between the disc and the pads, which ensures effective braking;
- longer service life of parts involved in the braking process: pads, rims and discs;
- lack of dependence on the weather;
- not susceptible to heating, which is especially important for the passage of mountain trails (downhill);
- high braking power;
- precise distribution of braking force;
- no need for frequent adjustments.
These brakes are the most current braking system today, consisting of the following parts:
- hydraulic lines;
- brake handle;
- a caliper with barrels into which pressurized brake fluid is poured to ensure the interaction of the pads and the rotor;
- adapter for fastening the caliper to the frame.
This type of brakes is significantly superior in efficiency to mechanical ones, since the density of the fluid in the hydraulic line does not change, it does not deform and does not compress, like a cable. But, an increase or decrease in temperature, if disc brakes are installed on a bicycle, require adjustment of the pads.
The disk installation procedure may be required in cases when:
- it is necessary to change or repair some part;
- replace the kit with a new one;
- install on a bike where other brakes were previously installed.
To install disc brakes on a bicycle, they are first identified with a mount. While it belongs to the international standard, it is not easy to install them.
In other cases, the installation of disc brakes on a bicycle is carried out in several stages:
- fix the brake handle adjustable with a hexagon on the steering wheel;
- a caliper is placed in the hole provided on the frame, but it is not temporarily tightened, leaving it to “float”. Then they look to see if the pads are evenly extended. To install the caliper in the right place, the brake is clamped, and I release it sharply, spin the wheel in both directions, checking for friction. If it is, i.e. the shoe rubs against the rotor, the bolts are slightly relaxed, and the caliper is shifted in the direction of the rubbing part. After removing friction, tighten the bolts. If they are loosened excessively, you will have to do the following again: release the handle smoothly, then press sharply. In order for the pads to approach the disc to the desired distance, it is necessary (with the caliper pressed) to press the handle sharply 15 to 30 times;
- the brake disc is attached to the hub with the bolts included in the package;
- the cable is fixed on the handle, inserted into the shirt using the frame guides;
- at the end, it is secured and adjusted by the brakes.
What is important to know when starting the adjustment
The brakes are very sensitive to the displacement of the wheel axle, therefore, to adjust the disc brakes on the bike, the shock absorber should be pressed when tightening the eccentric and bolts (you can sit on the bike).
When starting to adjust the pads, it is required to tighten the adapter tightly, install the caliper according to the instructions given here, pull out one of the pads by turning the screw half a turn, adjust the position of this part.
If the bike is equipped with Hayes brakes, unscrew the locking hex before performing the last action. When the setting is complete, it is turned to its previous position.
The caliper is pressed with great accuracy against the rotor so that their planes are aligned. When adjusting disc brakes on a bicycle, be sure to disconnect the shirt and cable. After that, the bolts securing the caliper are tightened alternately.
Having tightened 2 hexagons, the adjusting bolt is turned to its original position, the wheel is scrolled, and there is no friction. If so, it is allowed to push the block slightly forward with the adjusting bolt. Otherwise, do the opposite.
Next, they move on to pulling up the lever with the attached cable, for which they press the movable block and slightly displace the rotor to the stationary.
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Set the jacket and cable to the required position, controlling the location of the outer shoe, which should be pressed. Tighten the corresponding bolt lightly.
To tighten the disc brakes on the bicycle, you must take the correct position, for which, gently press the brake lever (until the working stroke). After tightening the fastening of the cable, check again whether there is friction or not. In the first case, you need to slightly tighten the adjustment on the handle. If there is no friction, the actions are reversed.
With correctly adjusted brakes, the adjustment on the handle is minimally unscrewed. it is easier to adjust the position of the cable on the caliper lever, keeping the thread of the handles.
Disc brake tuning recommendations
This process is simple, therefore, you can do it yourself. Would need:
- After fixing the wheel, center the caliper relative to the disc using washers of different thicknesses (included in the kit). They are placed between the mount on the frame and the rotor, choosing carefully. If it is noticed that the pad is rubbing against the disc, it must be diluted, for which the hexagon is unscrewed on the caliper;
- to adjust the position of the brake lever, unscrew a small hexagon under the brake lever. With a significant increase in travel, which negatively affects the braking power, it may be necessary to bleed the brakes;
- so as not to get air into the system, during work, it is not recommended to turn the bike over;
- actions to unclench the pads are required if the latter are compressed, which occurs due to pressing the handle when the system is not filled with oil and the rotor is not installed;
- after completing all operations, tighten the bolts again, check if there is any skew and displacement of the disc. To figure it out, push the pen.
Will help to correctly install and configure disc brakes on a bicycle video “Installing a disc brake instead of v-brake”
We fix faults ourselves
If friction of both pads is detected, it will be necessary to dilute them, for which they unscrew the hexagon in the brake lever, remembering that the more you unscrew it, the greater the handle stroke will become, i.e. pads will grip weaker.
If the stroke cannot be adjusted, i.e. the disc continues to rub, it is checked to see if it is bent. To level it, it is placed on a flat surface and the edge that rubs against the disc is bent in the opposite direction with an adjustable wrench. The key is preliminarily degreased. Do everything carefully so as not to permanently damage the disc with unnecessary effort.
It is easier to “cope” with a bent disc of a mechanical drive. In this case, the block is taken to the side, precisely determining which sector is bent, and aligned without removing it from the bike. Then proceed to leveling another area, repeating the steps until the entire disc becomes even.
If the disc brakes on a bicycle brake poorly, you need to look for the cause in clogged pistons. To clean the braking piston, proceed as follows: remove the wheel, remove the pads, push back the clean piston with a metal plate with holes for attaching pins.
While holding it, they try to push the problem piston, which requires pressing the handle. After cleaning it, apply mineral oil to the surface, return to its original place, removing excess grease with a napkin dipped in a degreasing solution.
If the brake lever falls through, air trapped in the brake line or a leak may be the culprit. In the first case, you will need to bleed the brake, in the second, replace the line.
The reason for the poor performance of the brakes can be the wear of the pads or oil that has got on them. To eliminate the first reason, it is enough to replace the pads, for the second, degrease the disc and pads (you can ignite).