What balls are used in a Ural bike

Urals in the hands of enthusiasts today

Ural bicycles in the form in which they were almost 50 years ago are no longer produced today. However, not all of them have already rotted or are lying around in the attic in the form of trash. Ural bike tuning is quite popular today. Some manage to change its appearance beyond recognition, while others simply restore its canonical appearance. Modernization is great encompassing all of its components. The most talented ones also equipped them with a motor from mopeds and even chainsaws.

Someone installs analogs of parts, and someone diligently and painstakingly restores the old ones. It is very difficult to find new parts for the Urals today. You can buy them mostly only from hands.

Ural bicycles

The Ural bicycle is one of the images of the USSR. Almost all children of that time rode on it. Perhaps even now someone has this Soviet bicycle lying around in the garage or in the village.

As for the history of this brand, the Ural bikes have been manufactured since 1965. Then the Perm plant launched the production of reliable and unpretentious bikes that would be useful not only for ordinary walks, but also for traveling long distances. They began to enjoy popularity almost immediately. Its design was simple, and repairs did not take long.

The Ural bicycle was more focused on the adult male population of the country, but the Perm plant did not forget about the other part of the population. Kama is another product of this enterprise. This is a ladies’ bike, which was lighter and more comfortable than the Ural. Teenagers who could not yet cope with the Urals also rode on the Kama.

Today, bicycles are manufactured by Ural-Trade LLC, which cooperates with bicycle manufacturers in India, China and Taiwan. This company now supplies the market not only with ready-made bicycles, but also spare parts and other components for bicycles.

Why did you love

First of all, the products of the Perm plant were convenient and unpretentious. The bottom bracket and bushings, the most frequently broken parts of any bike, were easily repaired and replaced. This was highly appreciated by the inhabitants of the Soviet Union. The Ural could be used to transport heavy loads and pokatushki to a neighboring village. It should be noted that it was in the countryside that the Urals were in great demand. The largest size fit almost all men and even some women.

Unfortunately, in contrast to the reliability, there was a very heavy weight of the bike. 16 kilograms. The fact is that the frame and other components of the large were made of steel. A modern high-speed analogue can weigh only 6-7 kilograms.

Snatching the new Urals in the 70s was considered very prestigious. They could be issued as a reward in factories.

Characteristics

Even before the start of production, a calculation was made of a suitable geometry, taking into account the anatomical features of the person. All great Urals were large with a frame height of 56 cm. The wheel diameter was 28 inches, which made it possible to operate the great in conditions of flat roads and off-road conditions. Although the tires were more suitable for driving on flat roads. Some still found a solution to the problem and installed self-made wider tires and tubes on the rear wheel.

It had a rear brake hub installed, but some enthusiasts later installed rim brakes on their bikes.

If we talk about the complete set, then it was almost always standard. But still, sometimes it expanded, and reflectors, footboards, reinforced trunks and even first-aid kits were installed on the bike.

URAL-TRADE LLC products today

In addition to the Urals, the Perm plant also manufactures components for bicycles of other domestic brands, for example, Stinger.

Ural bicycles are truly legendary bicycles in the history of Russia and the USSR. One of the few that has gained such popularity among all residents of the country. At one time, he was almost a universal means of transportation: it is a road, mountain, and even a sports bike. It all depended on whose hands he fell into.

The rework of these bikes deserves special attention. In the skillful hands of bicycle masters, it turned into a real work of art. Now, under the Ural brand, it produces only 4 bicycles, which are not used and are unlikely to become as popular as the older model.

Dignity

Soviet models have many advantages:

  • adjustable steering wheel and seat height allows people of different heights to use the same vehicle;
  • the durability of the device is achieved due to the material from which it is made;
  • a comfortable soft seat stretched over a rigid frame;
  • pedals are made of very high quality;
  • the product provides a rear lower brake, one sprocket;
  • there is a circuit protection;
  • the ability to transport large and heavy items;
  • wings are able to protect the cyclist from dirt flying from under the wheels.

The undoubted advantages of modern modifications include:

2015 Ural cT, What it is like without a Sidecar, Ural of New England

  • great design;
  • frame durability;
  • practicality of the device;
  • wide range of folding bicycles.

Specifications

Almost all Soviet products of the Perm plant include:

  • free-wheeling foot brake bushing;
  • a front sprocket with 48 teeth and a rear sprocket with 19 teeth;
  • cast steering stem;
  • soft saddle on a rigid frame.

Often, the standard equipment was equipped with additional elements: reflectors, footboards, chain guards, bags with pumps, first aid kits, additional trunks.

Story

The Ural bicycle began to be produced at the Perm Machine-Building Plant in 1965. The same company produced the women’s folding bicycle “Kama”. It is lighter and more comfortable than a male device. Ladies’ means of transportation were often used by novice cyclists. The company emblem was attached to the front frame tube between the steering wheel and the wheel.

Reliable and unpretentious transport immediately gained popularity and began to be in great demand. He was distinguished by versatility. The Ural bike is suitable for urban and rural areas. It was used to travel short and very long distances.

He could serve as a road, mountain, sports vehicle. For transportation of babies, a child saddle was attached to the frame.

The machine-building plant existed until 2006. Its successor, Ural-Trade LLC, works closely with bicycle manufacturers in Taiwan, China, and India. A modern corporation produces bicycles and spare parts for it.

There is no such huge demand for the new “Ural“, as at one time there was for the Soviet bicycle. The old models are very simple. It took little time to repair them, and any part could be easily replaced. If necessary, it was possible to adjust the chain length.

Overview of some parameters of adult bicycles

The road vehicle “Ural” 111-621 with a closed frame, not very high steering wheel, with a soldered fork has a wheel size of 40×622 mm. It is completed with terracotta-painted reflectors on the spokes, an electric generator, a flashlight, a bag with a set of tools, a tubular rack, a pump and a footrest.

Model В-124 “Ural”, produced in 1965, has a tubular brazed frame, cast pedals with ruby-colored reflectors, a rotary steering wheel with a stem, which allows the cyclist to provide the most comfortable fit. The men’s road bike weighs 16.5 kg.

2021 new Ural GEO Limited Edition studio details & action photos

Modification “Ural” B-142 has a rotary steering wheel with a deep bend, a tubular trunk with a clamp. Standard wheels provide a size of 40×622 mm.

Another Soviet vehicle design was named B-110 “Kama Progress”. Its weight was 17 kg, carrying capacity. 15 kg.

The most successful folding modification for adults was the “Kama” 113-613. Its main difference from the previous similar model was the hand brake and the design of the front sprocket. An innovation was the cast and loop folding of the frame. The weight of the product without additional devices was 14.6 kg, the size of the wheels was 406×40 mm. The device provided for 15 links of the driven star, the leading one. 48.

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Modern Russian models, made in Perm, have a steel frame, double aluminum rims, switches from 1 to 5 speeds. All the main characteristics are the same, with the exception of the ladies’ product, which provides for a frame of a different design.

The Perm plant produces vehicles with a closed brazed frame 111-631 “Ural” and 111-641 “Ural“. The size of their wheels is 622×37 mm. The first model weighs 14.7 kg and provides 1 speed. The second modification has 5 speeds, the weight of the product without additional elements is 14.6 kg.

The universal Russian bike 113-661 “Kama” weighs 13.8 kg and has a folding frame with a swivel earring. The modern handlebar with special grips allows for the most comfortable fit for the cyclist The size of the wheels is 406×40 mm.

The latest modifications 114-621 “Kama” and 114-622 “Kama” have a semi-open one-piece welded frame. The size of the wheels is 406×40 mm. The bike weighs 14 kg. The first model has 5 speeds and a reliable braking system. The second model provides 2 hand brakes, 1 speed. Products are equally suitable for adults and children.

disadvantages

Unlike modern lightweight bicycles, the weight of old adult counterparts is 16-17 kg. The frames and other transport parts made of steel, such as the steering wheel, fork and wheel frame, contribute to the heaviness. The Ural bicycle has only one speed. Modern cyclists prefer a multi-speed vehicle. Outdated design is also considered a disadvantage of the Soviet model.

The disadvantages of modern designs include low quality assembly, no branded additional accessories, a very limited selection of mountain, classic urban and women’s models.

All about Ural bicycles

One of the most reliable and best Soviet bicycles is deservedly considered “Ural”. Feedback from the owners of this vehicle testifies to the high quality of the product, to the excellent design and technical characteristics of its various modifications.

Testimonials

Owners of the Ural vehicle love it for its simplicity of design, sufficient carrying capacity, high quality, strength and durability. Many avid cyclists testify to the fact that they still use vehicles produced in the 70-80s of the twentieth century. Some consumers for a long period of operation only changed the camera and tires and systematically lubricated.

Summer residents also prefer this means of transportation. He is not afraid of pits, ditches, ravines, heavy mud. Most people note the excellent off-road bike ride with heavy baggage. Owners are improving transport, for example, installing a headlight on the rear wheel and even attaching a motor to the frame. Anglers claim that a bucket with a catch can easily fit on the rear rack, while fishing rods and a net attach perfectly to the frame.

Some cyclists rebuild and modernize old bicycles: shorten the chain length, replace the bottom bracket units with a modern square bottom bracket, paint and varnish the frame, add new parts if necessary.

Disadvantages of industrial bearings

  • Complexity of service. Industrial bearings are manufactured in a single cartridge, and the sides are usually sealed with dust caps, so they cannot be completely disassembled and cleaned. Although such a bearing is capable of working out to full wear in its native factory lubricant, if there is a lack or contamination of the lubricant, it is unlikely that anything can be done, especially in the “field conditions”
  • Unrepairable. A worn out industrial bearing cannot be rebuilt and repaired. Even if only one ball broke / flew in it, a ring burst or an anther was lost, a complete replacement will be required.
  • High price.. and kits from well-known brands for professional sports are even more expensive than some bicycles. Despite the fact that the bearings do not require frequent replacement (the average roll rate is from 10 to 20 thousand kilometers), such repairs are very expensive.
  • Excess weight. Industrial bearings, on average, weigh slightly more than their bulk counterparts. Despite the fact that for most cyclists the difference of several tens of grams seems insignificant, experienced athletes who want to make their equipment as light as possible do not rejoice at the extra burden. Recently, ceramics are increasingly being used in bearings, which makes it possible to level this difference. However, ceramic and ceramic-metal bearings are very expensive.
  • Difficulty selecting bearings of non-standard size and form factor. Modern bicycles usually use standard components, but some types of bearings can be difficult to find. Finding the necessary spare parts in this case takes considerable time and is associated with additional costs.

Replacing bulk bearings with industrial bearings in a bicycle

Mountain bike

On mountain bikes, the hubs have special axles that have an additional margin of safety, the same can be said for the bearings. Mountain bike axles have a high stiffness coefficient and diameter. The bearings are installed with high efficiency, they do not need adjustment, and they are easy to install.

Varieties and replacement of bicycle bearings

Bearings are special parts for maintaining the performance and fixing rotating assemblies. Their scope applies to everything where there is rotation and mating. The bike did not stand aside, because, in fact, it is a full-fledged transport with all its features.

Bicycle bearings are installed in all parts of the bike that rotate, change position and are under load. They can be found in the drive mechanism. carriage, wheel hubs, steering column and more complex devices. ratchets, switches, rear shock absorbers.

Replacing wheel hub bearings

The hub is not just a wheel pivot. Without the built-in articulation mechanism, forces would be transmitted unevenly to it, and the bike would not be able to move. The same symptoms appear when the bearings are worn out.

Disassembling the hub is as easy as disassembling a fork. For the rear wheel, the procedure will be slightly more complicated than for the front wheel, since you will first need to remove the cassette with sprockets. On a single-speed bike, the retaining ring and the sprocket itself are dismantled.

In general, the disassembly looks like this:
1. Remove wheels from dropouts.

Dismantle the sprockets with a cassette puller and a locking whip. On single speed, open the stopper with a screwdriver or a special spreader.

Unscrew the fastening nuts with a 15 wrench. For the rear wheel hub, unscrew the nut on the side opposite to the stars.

Pull out washers and bearing units. Bulk ones are being moved, industrial ones are being replaced by new ones.

Clean parts and replace damaged components.

Pull out the axles, wipe the inner cavities of the bushings.

Reassemble in reverse order. It is important to place the bearings correctly and press the cones in the same way as before disassembly. In no case should it be skewed, the details should exactly fall into their rightful places. It is not advisable to swap them during a bulkhead. This threatens backlash and deterioration of wheel travel.

New bearings are selected in advance according to the old ones. they must be the same as they were before the repair. Lubrication is the key to rebuilding and replacing (in the case of “bulk”). When installing the “flush”, the assembly itself does not need to be lubricated, only the inner cavities of the bushing and the axle. After installation, we check the performance of the wheels: smooth running without play and clamps indicates that the parts are installed correctly.

In what cases to change

The bushing and bearings must be regularly inspected, tested, retightened and lubricated. This important block cannot be “started”, otherwise the bike will not be able to move normally. Signs When Paying Attention to Rear Hub Bearings:

  • while the bike is moving, noise is heard in the area of ​​the rear wheel fixing unit;
  • wheel play becomes excessive;
  • there is a sharp creak and “crunching” of the bearing;
  • rolling dynamics deteriorates.
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If you do not pay attention to the “first signals”, then the situation will worsen, the bike will quickly fail. Before the start of the warm season, you should:

  • Checking the wheels for an important parameter. backlash, the bearings must not be tightened too much;
  • Dismantling of wheels and frame must be carried out in a specialized room.

In what cases to change

The bushing and bearings must be regularly inspected, tested, retightened and lubricated. This important block cannot be “started”, otherwise the bike will not be able to move normally. Signs When Paying Attention to Rear Hub Bearings:

  • while the bike is moving, noise is heard in the area of ​​the rear wheel fixing unit;
  • wheel play becomes excessive;
  • there is a sharp creak and “crunching” of the bearing;
  • rolling dynamics deteriorates.

If you do not pay attention to the “first signals”, then the situation will worsen, the bike will quickly fail. Before the start of the warm season, you should:

  • Checking the wheels for an important parameter. backlash, the bearings must not be tightened too much;
  • Dismantling of wheels and frame must be carried out in a specialized room.

We change the bearings on the bike correctly

Details about replacing bearings on a bicycle. Step-by-step instructions and important features.

Replacing the rear wheel bearing of a bicycle is an important operation. The bearing is one of the basic parts in any mechanism. including in a bicycle. This element fixes the wheel and at the same time allows it to rotate freely. There are several types of bearings, each of which has its own undeniable advantages and disadvantages.

Ural / Dnepr. Bearings and their imported counterparts. Oil seals.

Dear Colleagues, Brothers!
I decided to write another article on the selection of bearings for the Urals and the Dnieper to help you.
I work for a bearing company, so you can rest assured of my knowledge and understanding of this issue.
I think that my experience and the information I want to share with you will be useful to you.

TABLE OF BEARINGS FROM THE MANUAL: Motorcycles Ural Dnepr. Maintenance and repair. (Background information)

BEARING SELECTION TABLE.
(slightly modified, repeats the previous table, taking into account additions and corrections)

All POSSIBLE ANALOGUES (in blue) can only be used with changes to the design!

ROLLERS in gearbox
5×12 only in the drive gear (differential)
3х15,8 reducer (hub of the driven gear wheel)

TABLE OF CONFORMITY OF IMPORT ANALOGUES TO DOMESTIC.
http://bearing-service.ru/info/table_ob/
Instead of the last two zeros, we substitute the shaft diameter divided by 5.
Example
In the corresponding line of the table, we substitute
Shaft 25 25/5 = 5 substitute 20005 = 205 = 6205
Shaft 50 50/5 = 10 substitute 30010 = 310 = 6310

IMPORT BEARINGS
LETTER DESIGNATIONS

2RS. contact seal on 2 sides made of rubber, reinforced with sheet steel (and various variations)
RS. contact seal on one side made of rubber, reinforced with sheet steel (and various variations)
2Z. metal shields on both sides (and various variations)
Z. protective washers made of metal on one side (and various variations)
C3. increased thermal clearance (for high speeds and temperatures)
As a rule, C3 is used at high speeds, or when
bearing temperature transfer from adjacent parts temperature
more than 70-80 degrees (from 70-80 to 100), usually from the shaft.
The thermal conductivity of housings is almost always higher than that of shafts, therefore
the temperature of the inner ring of the bearing and its rolling elements is higher
5. 10 ° C higher than the outer ring temperature.
C3 and C4 are needed so that the bearing does not jam from overheating.
N, NR. with a groove with a snap ring (NR. with a snap ring included)
Separators: Steel (J), Brass (M), Polyamide (TN9). textolite.

Decryption example:
6204-2RS / C3 (analogue 76-180204)
2RS. contact seal on 2 sides made of rubber, reinforced with sheet steel
C3. increased thermal clearance
204. standard size of the bearing in terms of internal and external dimensions

—I RECOMMEND to install bearings with an increased thermal clearance C3 for high speeds and temperatures

—Of normal imported bearings, I recommend using the following brands: SKF (Sweden), FAG (Germany), IBC (Germany), IKO (Japan). needle, Asahi (Japan), Nachi (Japan), NSK (Japan), NTN (Japan) ).

LETTER-DIGITAL DESCRIPTION OF DOMESTIC BEARINGS (for your understanding):
Domestic bearing number consists of:
Clearance. Accuracy class. Perfix. Number (by size). Letter designation

ACCURACY CLASS (up to bearing number)
0, 6, 5, 4, 3, 2, 1
Sometimes, when repairing old equipment, there are bearings with an accuracy class designated by the letters H-, P-, VP-, V-, AB-, A-, CA-, C- this is the old designation of accuracy classes.

0, 6. accuracy class for household use
5, 4. accuracy class for machine tools (more accurate)
– The rest are not important to us (there is no point, high cost and not available, it is better to use imports)

An example of decoding numbers
76-180204 А (analogue 6204-2RS / С3)
76. clearance (corresponds to C3. increased), accuracy class 6
180. contact seal on 2 sides made of rubber, reinforced with sheet steel (in 2RS import)
204. standard size of the bearing in terms of internal and external dimensions
A. bearings of increased load capacity

Decoding of perfixes (in the bearing number itself, in front):
180. contact seal on 2 sides made of rubber, reinforced with sheet steel (in 2RS import)
160. contact seal on one side made of rubber, reinforced with sheet steel (in RS import)
80. protective washers made of metal on both sides (in 2Z import)
60. protective washers made of metal on both sides (in import Z)
76. clearance (increased thermal clearance C3), accuracy class 6
70. clearance (increased thermal clearance C3)
50. Under the retaining ring (in import NR)

NOTE
In imports, as in the homeland, the last 2 digits are the shaft diameter 04×5 = 20 mm (the last 2 digits are multiplied by 5, with the exception of small diameters up to 10 mm)

FREQUENTLY USED LETTER INDEX (after bearing number)

L. Brass separator (in import M)
E. PCB separator (in TN9 import)

If there are no letters (L, E, D, D) at the end of the bearing number, the cage is steel.
– You can probably only pay attention to the letter indices L, E.
– You can ignore the rest. Most likely, these requirements are not met, or are not significant.

—Of normal domestic ones, you can use bearings produced:
JSC “Samara Bearing Plant” (SPZ or GPZ-9)
JSC “Volzhsky Bearing Plant” (GPZ-15)
CJSC “Vologda Bearing Plant” (VPZ)
Previously, we supplied bearings, including for import.

balls, used, ural, bike

OIL SEAL SELECTION TABLE.

Ural 650 engine and lower valves (50×70, 16×30)

Ural checkpoint until 2005 (32×45, 35×48, 20×40, 12×25 2 pieces, slider ring)

Dnieper checkpoint (32×45, 35×48, 20×34, 16×30, slider ring)

ATTENTION. check the dimensions of the gearbox secondary shaft oil seal. 35×48 or 36×48.
Earlier goes 35, later. 36.

Came across one link
Oil seals for imported cars
http://cars.febi-parts.com/3d.php
Interactive catalog
In order to see the oil seals, you need to dial:
Universal and DIN parts / Oil seal (click on the oil seal picture and a list will appear)

For each oil seal there are dimensions, material of execution, the brand of car where it is placed and the code number of the oil seal.

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If you need any additions. throw ideas!

You can write a lot about bearings, but I did not smear!

The road beckons us with freedom
Roll off her and you’re in hell!

I propose to fix this topic in “IMPORTANT” at the very top.
Moders, respond!

You know better gentlemen.
I wrote, and if you really want to. put forward a proposal to Stirlitz

The road beckons us with freedom
Roll off her and you’re in hell!

I’ve been looking for such a post for three years!
thank! DEAR OPPOSITCH!
uniquely!

I am slowly adding to this post.
I try to make everything clear, lay out the most necessary.

The road beckons us with freedom
Roll off her and you’re in hell!

It is more prudent to modify the last table. Add their geometrical dimensions to the factory codes of the cuffs and from which h.p. they can be commandeered.

Table 4 and 5 are the same.
The 5th table indicates where the cuff is used, the 4th indicates the geometric dimensions.

thanks, useful info. it would be nice to have analogs of imported oil seals in more detail.

The camshaft oil seal on the 650th motor oil seal from the backstage of the gearbox vaz08.09 size 16×30, the quality is at the level.

In krasava! There are still oil seals 12×25, 20×40, 32×45, 36×48 (from the gearbox) and 45×59, 45×60 (from the gearbox before and after 2006, respectively).

1,536,229
this is an oil seal in the bridge, the one that is 45×60
a 45×59 is a semiaxis oil seal from Suzuki Grand Vitara

I will be more relaxed, I will think about your requests.

These cuffs can probably be found in the industrial sector.
But whether they will work in the same way as machine ones is a question.
(different conditions of use)

Gearbox crank shaft. 16x30x7.
Trigger Shaft. 20x34x8.5.
Camshaft. 16x30x7.
Crankshaft. 60x85x12.
Propshaft fork. 33.8×49.3×8.
Differential. 24x38x8.
Main gear housing. 44x93x12.5.
Gearbox, secondary shaft. 36x48x8.
Gearbox, primary shaft. 31.5x45x7.
Front Fork. 34.5x45x16.6.
Steering column. 51×59.6×5.
Wheel hub. 24.8x38x8.
Clutch, shutdown rod. 4.4×10.3×8.
Shock absorber rod. 11.1x24x8.

Thank you very much. The article is definitely a favorite. The glands on the shaft seals follow the Honor parameter as the direction of rotation.

Kuzz, directional oil seals are used in the car.
In industrial cuffs, there is no direction of movement as such.

I plan to improve this article to make it more understandable and logical.
I will make a clearer decoding of bearings, etc., etc.

Oil seals in the Ural gearbox: primary shaft-oil seal of the semi-axle VAZ classic; secondary shaft-gland input shaft Gazelle.

Somewhere there was an article on the opposite in which the cuffs are indicated by size and applicability and the technique in which they are placed, but I did not copy it.
Perhaps I will write an article on the cuffs separately

And the accuracy class and increased carrying capacity are somehow indicated in the import?

apparently not?

If I need an imported bearing 40x80x18 with a steel cage, accuracy class no less than 5, increased load capacity, and (if you follow the author’s recommendations) increased thermal clearance, its designation should simply be “6208 C3”

40x80x18. 6208 / C3 or 6208.C3
In SKF, the accuracy class is not prescribed, it is believed that the bearings make the 5th accuracy class by default.

Some companies prescribe an accuracy class (for example, IBC. Germany)
Denoted
P5 bearing with increased accuracy of size and stroke (above P6), compliance with ISO class 5 tolerance
P6 bearing with high dimensional and stroke accuracy, ISO tolerance class 5
P53 tolerance class P5 bearing clearance C3
P63 tolerance class P6 bearing clearance C3

IBC with this marking 6208.P53 (class 5, thermal gap C3) you pay 1416r, although the usual 6208.C3 (class 6, thermal gap C3) costs 344r from the same company
A regular 6208 / C3 SKF costs 645r.

For comparison in the fatherland
75-208th grade 5 with a thermal gap costs about 190-700r
76-208 grade 6, a regular one with a thermal gap costs about 120-200r
Bearings cost differently from different companies in different cities, I take the average cost.

Question. you need it.
Where do you get such precision.

This was essential in the fatherland because there are many poor-quality bearings of the fatherland, China.
And when you take a good imported bearing, you already know that it is of good quality.
Although no one is immune from fakes.

THERMAL GAP
In SCF it is designated 6208 / C3 (through a fraction).
In other companies, it may be designated 6208.C3 or 6208-C3
When you look on the site, you may not find such, although they are common.
Often in the C3 search engine, the thermal gap is not indicated. (you need to call and ask)

When you talk to sellers. talk. bearing 6208 with a thermal clearance C3 (for high speeds).

As a rule, the thermal gap is not reflected in the drawings.
The drawing reflects the standard sizes, and the thermal clearance is one of the specific characteristics of the bearing.

By the way, specify which separator you are offered! (it’s not a sin to ask this)
Bearings with a thermal clearance C3 are available with different cages. steel, brass, polyamide (plastic).
It is believed that for high speeds of rotation there must be a polyamide cage (plastic) and a thermal gap (C3).
See for yourself what is best for you.
The separator as such does not bear any load. it only separates the rolling elements.
I still prefer a steel separator for my motorcycle, although I talked with a person who has a plastic separator in his motorcycle.

INCREASED LOADING CAPACITY
As for the increased carrying capacity. in the import, most likely there is no such parameter.
And how is it increased?
To increase the carrying capacity, you need to change either the contact area or the number of balls.
In the ball, the contact patch with the raceway is the point. To increase the point of contact. you understand it is impossible.
Otherwise, they would not be balls, but cubes. It would probably be fun to ride on bearings with cubic rolling elements =)))))))
And increasing the number of balls is irrational. it will cost more, and besides, it is unlikely that anyone will need it.

In order to increase the carrying capacity of foreigners, it is believed that it is necessary to change the type of bearing. to switch from ball to roller at the expense of rotation speed and noise (roller is noisier than ball)

In our country (in the fatherland) they came up with some kind of nonsense, introduced another letter (A. increased carrying capacity) in the markings and fool people.

For clarity, I give a drawing of domestic bearings 208 with increased load capacity and the usual one, where you can see everything yourself and compare their characteristics (figure below)
http://autoshtamp.ru/cgi-bin/ctlsearch_db.cgi

In the figure, the first column is 208 A. with an increased load capacity, the second column 208 is normal.
Find the difference.
Question. where is the different number of balls, where is the increased load capacity (static, dynamic).
And this is by the way according to GOST.
In general, make a fool of your head.