We calculate correctly what pressure should be in the tires for a car or motorcycle, and how to change the pressure correctly

The need to monitor the level of tire pressure is dictated primarily by safety conditions for road users. It is also important to maintain the car in good technical condition.

Manufacturers of tires and vehicles do not regulate changes in tire pressure depending on the season. But such a need still arises, especially where the quality of roads is poor. It also matters whether the car has cargo, passengers, or just the driver. These factors influence what tire pressure should be in the summer:

• for a lightly loaded car (with one or two passengers), the optimal value is 1.9 atmospheres with tires of common diameters R13-R16;
• if all the seats in it are occupied, and there is also luggage, it is better to inflate the front wheels to 2-2.1 atmospheres, and the rear wheels to 2.3;
• on an uneven road, it makes sense to lower them by 5-10% of normal so as not to get tired of shaking.

In winter, it is better to slightly inflate the tires , no more than 10-15% of normal. This will help increase the stability of the car and make it easier to control. With reduced tire pressure, the braking distance is shortened, which also contributes to safety. It also affects the suspension - driving on broken, frozen asphalt becomes more comfortable due to reduced shaking.

In low-profile car tires, the pressure depends on their width, the cross-sectional ratio to it, as well as the diameter of the rim (presented in the min/max table).

With profile 25 there are only 2 types of tires. And for both, normal pressure is 2.9. For R15 and R16, the optimal indicator is: when the car is half loaded - 2 atm.; at full – 2.2. If the bulk of the cargo is in the trunk, the pressure in the rear wheels needs to be increased by another 0.2.

If the wheels of a motorcycle are R-17 , then for the rear the indicator is 2.9 with a width of 180, for the front with the designation 120 - 2.5.

Read more in our article about what pressure should be in tires and its measurement.

In this article:

Check your blood pressure regularly

Sounds like a given, right? But it's still worth repeating: check your tire pressure regularly when you ride. I check it a couple times a week, and more often if I drive past new construction (trucks love to throw nails around). If you're going on a long ride, check your pressure daily, either before the bike has been sitting for a couple of hours and you go to bed, or first thing in the morning. This allows you to detect a slowly deflating tire in advance.

Motorcycles and tires are different. A heavy cruiser will need higher pressures than a small sportbike, and an enduro with knobby tires rides at lower pressures than an adventure bike with dual-purpose rubber. A scooter is different from a cafe racer. Do not inflate your tires to the "MAXIMUM PRESSURE" printed on the sidewall - this is too high.

pressure. Refer to the information in the user manual or look at the sticker on the pendulum.

Irbis TTR 125 - off-road conqueror at an affordable price

Good pit bikes are made not only in China. This is confirmed by the Russian brand Irbis, born in Vladivostok in 2001 . In addition to pits, the company produces scooters, snowmobiles, ATVs and components for them. Separate departments also develop accessories for bikers.

One of the most popular models of the company was the IRBIS TTR 125. A pit bike that organically intertwined the capabilities of a large touring enduro bike and its small size , allowing even schoolchildren to easily handle it.

A special highlight is that Russian legislation does not require a license to drive such transport, and it is impossible to register it.

Use a good pressure gauge

And always the same. Pressure gauge readings may differ by tenths of an atmosphere. If you use the same one, you will be able to track the changes. It's worth investing in a good pressure gauge. If you are as obsessed with this issue as I am, then, of course, you have calibrated all your pressure gauges relative to each other and know which ones deviate by how much relative to the others (and even wrote “+2” on the one that points to 0, 2 atmospheres below real ones). Is it true? Certainly.

Suspension

The Irbis TTR 125 is equipped with a fairly high-quality and reliable suspension for this class of motorcycle. Of course, it won’t survive hard jumps and tricks, but it can cope with fast and dynamic driving on a dirt road. When tuning, motorcyclists often equip their bike with new shock absorbers, similar in their characteristics to the standard ones. The advantage of the motorcycle design is the presence of footrests that automatically retract when falling, making them impossible to bend or break.

Why is it important?

A severely underinflated tire can become dismounted while driving, and this immediately spells big problems. A slightly underinflated tire will feel "jumpy" and "jumpy" - you might think there's something wrong with the bike overall. The carcass of this underinflated tire will flex too much, causing overheating and uneven and premature wear. An overinflated tire will not provide adequate grip, but will provide a very rough ride. So stick to the golden mean - not too soft, not too hard. Remember how the motorcycle behaves when the pressure is within normal limits, and feel free to experiment within a few tenths of an atmosphere. Keep your tires inflated to your liking and don't let them veer too far in any direction.

Technical specifications TTR 125

The Irbis pit bike model belongs to the category of budget motor vehicles, so you shouldn’t expect much power from it.

Some technical data declared by the manufacturer are not confirmed in practice. The maximum load is 150 kg, but motorcyclists say that it is impossible to ride the TTR 125 bike together - it cannot withstand such weight. The technical specifications also indicate that the maximum speed of the motorcycle is 100 km/h, while in practice it only reaches 80 km/h. However, the TTR125 bike also has its own advantages: it is equipped with a high-quality and reliable braking system, an easy-to-control suspension, and has excellent dynamics. High-quality tires installed on a motorcycle allow you to get out of the most difficult trails.

When can I change the pressure?

When you are on the track or when you want to lower the pressure by 0.1-0.2 atmospheres in order to squeeze maximum grip out of the rubber. Too soft and the grip will be lost, but a slight reduction will improve grip. On the roads, you should adhere to the values ​​recommended by the manufacturer - this will ensure the best combination of grip/lifetime/feel of the tires. Overinflated tires will wear out more slowly, but the grip and feedback will not be the same.

When you're running off-road on toothy tires, you need to let more air out of them. Many endurists ride at 0.7 atmospheres or even less. A tube tire will cope with low pressure much better than a tubeless tire, but at such values ​​you definitely cannot drive on asphalt. If you're riding off the pavement on your dual-purpose motorcycle, carrying a pump with you and inflating the tires when you get back on the pavement will save you from getting a puncture caused by hitting a pothole with empty tires.

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Pitbike Irbis TTR 125

The Irbis motorcycle is a budget model of pit bikes produced by the company of the same name, which produces enduro class vehicles. The model is almost universal, since it can be used both in urban areas and off-road. Motorcycle enthusiasts note that the TTR 125 motorcycle is lightweight, compact in size, powerful engine and durable steel frame. The pit bike is equipped with a universal suspension, thanks to which you can not only ride it, but also perform various tricks. Despite this, moving around the city may require a little tuning of the TTR 125.

Review of the Kayo pit bike, with the uh 140 engine. Run-in.

I'm 40 years old and I finally bought myself a new moped. With beautiful red rims and steering wheel. For what? Maybe to realize the complexes of youth or as a big iron toy? I declare responsibly - no. Despite the fact that in my youth my dad never bought me Voskhod-3M or Minsk, I did not take my complexes with me into adulthood.

In general, I first got on a motorcycle at the age of 30, having ridden 500 km on a 150 cm3 scooter from Moscow to Kursk, without a license or riding experience. Since then, step by step, I began to realize myself in motorcycle trips over medium and long distances and getting acquainted with the world of enduro.

But, closer to a fairy tale. I bought Pete brand new. I chose a 140 cm3 engine, without kick, but with light. Before that, I rode classic 250 cm3 enduros, such as the Suzuki Jebel, but realizing that it was not enough for smooth roads, and difficult for bad ones, I switched to the pit bike class. I will describe in detail what I got: disc brakes, a Cab engine with an oil cooler, an air box (on the 2018 model), an excellent capacity tank (5 liters), cross-country Chinese tires and inverted shock absorbers.

Since Pete was already assembled, I asked to blow 8 atm into the shock absorber, remove the exhaust plug, put the documents in my pocket, and drove it home straight from the salon. Of course, the first kilometers (motor hours) are extremely important for the health of the motorist, so I drove smoothly and braked gently. First of all, I bought a set of mirrors and steering wheel spacers for them on the market (700 rubles) because... I’m used to seeing what’s behind me. It was extremely uncomfortable without mirrors. I didn’t install a buzzer or turn signals - after all, the equipment is not for public roads, though.

The hardest were the first 5 engine hours, when I was not driving, but throwing up at up to 5 thousand revolutions, waiting for the pads and gears to grind in in the box.

How to grind in pads

— smooth acceleration and alternate braking with the front and rear circuits so that they have time to heat up and cool down. You can do this on long descents and straights. If you overheat, then nothing will happen, but the caliper will jam and you will have to remove the brake fluid from the caliper or wait until it cools down. In the worst case, you will overheat the disk itself and it will fail, after which you need to go to the store for a new one.

How to break in the engine

— for the first 5 engine hours, accelerate very calmly and smoothly, the speed is no more than 5 thousand, but at the same time the engine must operate at different speeds, i.e. do not work as a generator - dialed 5 t.v. and we're going for a week, no! The engine needs to change operating modes and allow it to be under load + cool down on descents with the throttle closed.

How to roll away a box

— it is very important to roll in ALL four gears evenly, and not just one, and do this in the traction and release mode, so that the gears roll on both sides: acceleration and coasting (with the gear engaged). This will allow you to quickly remove all metal flash from them and remove them from the engine during the first oil changes.

How to roll in wheels

— it is important to adjust the ground pressure (no matter how funny it sounds) and every 5 engine hours to check the tension of the spokes with a special wrench — tighten if necessary. And this need is 100%. Otherwise, if you lose the rim, go back to the store for a new one????

Why change your oil often?

— the first replacement according to the manual, after 10 hours, but I recommend you not to be greedy. When you drain what was poured at the factory, you will see an incomprehensible substance of a light earthy color. Of course it's oil, but what kind? Maybe sunflower, from McDuck? And because The oil tank capacity is only 1 liter, then a good semi-synthetic every 5 hours. will significantly extend the life of the pita and will not drag you down. Although, after 30 m.h., you can start replacing as early as 1 to 10 m.h.

After the first 5 hours I changed the oil, stretched the spokes, chain, adjusted the steering wheel and, in fact, that’s all. However, what were the difficulties and nuances during this time?

1. A relatively easy kick start was noticed when cold and difficult to start when hot. Those. when I was stalling in an open field and the ground was in dust under me, I could not rest the footrest in order to properly stand on the pit and pull the kick. At the same time, the pit refused to start and it turned into dancing with a tambourine. After the first day, my right foot hurt from the kick! And at the same time I rode in motorcycle boots. And you can’t start a pit from a pusher into a field, because... excellent compression blocked the wheels in second and even third gears and prevented it from turning. Of course, on asphalt this number is easier, but only in second gear. After 12 pm started cranking up with half a kick????

2. The clarity of gear shifting changed and WELL, the gearbox began to work only after 10 pm.

3. Shock absorber operation has not changed

4. In addition to the wheel spokes, only 15% of the bolts required broaching, i.e. Build quality is good.

5. There are no comments on the plastic - no falls recorded.

6. When washing the rear wheel with a hose, water enters the air box, after which it “dances with tambourines” to start. Although this same air box performed excellently in all difficult conditions and did not allow the air filter to get wet, as is easy to do with the version where the filter is open. (nulevik)

7. There are no comments on the frame - there were no falls, and Pete withstood all my pirouettes and drifts perfectly.

8. Chain - a beautiful gold chain has turned into a rag and can already be thrown away. It stretches like snot.

9. I replaced the drive sprocket with +1 tooth - it became better to ride on country roads and straights, while the control of the driver on descents did not deteriorate.

In the following reviews I will tell you what is happening to Pete and how he prepares for the winter motorcycle rally.

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Wheels and tires

So that newcomers and amateurs in our motorcycle fraternity do not get confused in terms, we have prepared a short information about the general differences between motorcycle tires.
What types of motorcycle tires are there? What are they for?

All motorcycle tires are divided into 4 large groups: slicks, road tires, dual-purpose tires and off-road tires.

Always wondered what these colored stripes are on tires? Now we'll explain everything.

The question arose about finding sliders, not for a pit bike, but for a full-fledged motard. A bunch of different options were reviewed, but even branded sliders from top companies were either not suitable or were clearly made with the expectation of one micro-drop, after which they would simply fly off in an unknown direction! AND THE PRICE LIST. it's just awful! And they were all cast, that is, vacuum molded. In short, hard, brittle plastic with a huge price tag.

A towing device was installed on the rear wheel immediately after purchasing new rims, because due to the specifics of the rubber and the crazy grip, the tire simply turned on the rim and naturally tore out the wheel spools. In addition, in winter it is necessary to keep the tire pressure to a minimum; for example, last winter I drove at a pressure of 0.7 At.

There were no problems with the front wheel, as the tires were so-so, and the brakes were completely original. But after installing good tires, a PRO caliper, a Wenchel reinforced hose, and a Brembo brake machine, the chambers began to break through once or twice. This is because now, due to the increased grip and powerful braking force, the front tire also began to rotate on the disk, tearing off the spool valves.

As we all know, pit bikes were originally created more as entertainment than serious sports equipment.

But time passes, everything changes, and from toys for entertainment, pit bikes have formed their own established class and occupied a full-fledged niche in motocross.

Of course, in our country, the level of competition can hardly be called professional. For the most part, amateurs go to cross-country tracks on amateur-class pit bikes.

So, we all know that motard wheels currently exist in two main sizes: 12, which are cast and spoked, and 14, which are only available in spoked versions. 10 wheels are also very rare, but there are only a few of them.

It so happens that 70% of pit bike owners use their pit bike more as an enduro bike than as a cross-country sports equipment.

Basically, what is the difference? Everything is obvious: sports equipment is intended for use only in cross-country mode. And enduro... It’s complete trash: I go where I see, and everything is here, and this is crushed stone, and a field, and soft and hard soils, and asphalt pavement.

I think many have seen the unconscious cries of “Yes, these hubs are rubbish, the bearings will soon be hanging out in them!” Such school nonsense is heard every day and constantly, with or without reason.

So, we will talk about the seats of the wheel bearings and why the seats sag.

Not an article, but a cry from the heart and a monument to idiocy. We will talk about such an elementary thing as rim tape. The murderous idiocy of using or, conversely, ignoring this IMPORTANT DETAIL has been noticed by me more than once.

Wheel bearings require periodic replacement and careful monitoring of their condition, otherwise they will simply fall apart. Moreover, this will first be reflected on the rear brakes in the immediate disappearance of the pads. But if you are such a slob like me, for example, and you missed the moment, and what is left of the bearing is a set of scrap metal, then read and watch.

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Dimensions

The TTR 125 pit bike differs from classic motorcycle models of the same class in its dimensions. Seventeen-inch wheels are installed at the front, fourteen-inch wheels at the rear, unlike conventional pit bikes, which are equipped with ten-inch wheels. Thanks to larger diameter wheels, the Irbis can be ridden not only by teenagers, but also by adults, with one limitation: the driver’s height must be between 160–180 centimeters.

Off-road tires, a disc brake system on both wheels and spoked wheels not only give the motorcycle an original appearance, but are also characterized by increased efficiency and do not require any maintenance. The disc brake system compares favorably with the drum brake system due to its greater efficiency and better braking in difficult road conditions: rain, snow or mud. When braking, accelerating and off-road driving, the special cross-country tires installed on the Irbis TTR 125 motorcycle also provide considerable assistance.

Most dirt bikes are not equipped with lighting equipment for several reasons. Firstly, it significantly increases the weight of the vehicle, and secondly, it is easily damaged when dropped. The simplest headlight is responsible for the safety and convenience of movement in the dark. A motorist can remove it at any time, replacing it with a special plug. The front fender of a motorcycle is often replaced with a higher analogue.

The Irbis motorcycle can be used all year round - both in winter and summer. Since such equipment is not intended for use on general purpose highways, it does not need to be registered with the traffic police. A category A driver's license is not required to operate a bike.

Pit bike tuning

Fans of tuning will not like the Irbis TTR 125: the minimal design does not allow for any improvement. The engine installed on it has maximum power, it is almost impossible to increase it. Experts advise equipping the rear shock absorber with protection, since it quickly becomes clogged with dirt when driving off-road. You should resort to visual tuning only if you plan to use the motorbike for other purposes than its intended purpose. For his own comfort and convenience, the owner can replace wheels, tires, install mirrors and additional lighting.

Where can I buy an Irbis bike?

The minimum cost of an Irbis TTR 125 motorcycle is 30–33 thousand rubles. The price may vary depending on the dealer selling the bikes.

It is quite possible to purchase this model for 15–20 thousand rubles. The cost of a used pit bike is affected by the mileage, year of manufacture and general condition of the vehicle.

Irbis TTR 125 is a good cross-country motorcycle of domestic production and Chinese assembly.
In its category it is one of the best in terms of price/quality ratio. The pit bike is distinguished by its technology, attractive appearance and excellent handling and is suitable not only for teenagers, but also for adults both for educational purposes and for conquering off-road terrain. Irbis TTR 125 is a lightweight cross-country motorcycle with Russian-Chinese roots.
It is assembled in Russia from components produced in China, and, having been sold in showrooms for several years, enjoys quite impressive popularity for a Chinese motorcycle. However, the reasons for this popularity are quite clear. While not a very modern or technologically advanced bike, the Irbis TTR 125 is different - a captivating combination of good quality and low price. We mentioned quality for nothing. There are plenty of reviews online from Irbis TTR 125 owners who report that after the purchase they had to personally tighten all the loose bolts and collect the dangling wires in untidy “snot.” Alas, there are sometimes problems with the build quality, but the quality of the parts themselves is quite up to par, not to mention the fact that, in general, consumables and spare parts for the Irbis TTR 125 are really cheap. Thus, the Irbis does not fit into your pocket when it comes to maintenance and service.

Technically, the motorcycle is very simple - a steel tubular frame, a 4-speed gearbox and a 1250 cc four-stroke air-cooled engine producing 8 horsepower.
Quite a bit, but the Irbis TTR 125 is enough. Firstly, the dry weight of the motorcycle is less than 70 kilograms. The Honda XR250 immediately comes to mind ... Well, secondly, short gears contribute to the good dynamics of the motorcycle.
The maximum speed of the Irbis TTR 125 on a flat road is limited to 90 km/h, but for a lightweight and, at the same time, very budget motocross motorcycle, this is not at all critical. But thanks to its low weight, the Irbis is much easier to handle in its usual habitat - off-road. However, an inverted fork is adjacent to the simplest frame, engine and transmission. Such a system is rarely found even on noticeably more expensive motorcycles, so in the case of the Irbis TTR 125 this is a definite plus. Another advantage of the motorcycle is its solid endurance. This lightweight Chinese “cross bike” can withstand a lot, the main thing is to look after it and service it on time. The Irbis suspension can withstand quite serious tests. Sitting on a motorcycle is, of course, tough, but you shouldn’t go on trips on it, right? And the volume of the tank, which is only 3.2 liters, is also slightly puzzling. Due to its modest dimensions, the Irbis TTR 125 may prove inconvenient for a tall motorcyclist, especially if its weight fluctuates around a hundred kilograms. But for lighter and not particularly tall beginner cross-country athletes, the Irbis will seem both convenient and at the same time easy to control. So for those who want to join the world of two-wheeled conquerors of mud and forests with swamps, the Irbis TTR 125 can be a very budget-friendly and at the same time quite high-quality solution. Source

Owner reviews

If you read reviews about the Irbis TTR 125 on the Internet, most of them are positive:

“It’s a good enduro considering its cost; I bought it for my son, who dreamed of an off-road bike. But after the purchase I had to go through everything and tighten it up. Sergey. Novokuznetsk"

“An excellent bike that is pleasant to ride in the forest and even in the mud. Sometimes there were problems with the chain, but I solved them simply - I replaced the chain with a more powerful one. Igor. Lyubertsy"

“After I read the technical specifications, I immediately bought an Irbis TTR 125, gave it to “craftsmen” who disassembled and reassembled it. Now it works “like a watch”, although that’s what I wanted for such a ridiculous price. Vladimir. Nizhny Novgorod"

“I’ve wanted a pit bike for a long time, but I always felt sorry for the money. On the advice of a friend, I purchased an Irbis TTR 125, which has been making me happy off-road for more than one season. Vitaly. Moscow city"

Video review of Irbis TTR 125

Video review of Irbis TTR 125 R

Specifications