Optimal tire pressure in winter: how to measure and what does incorrect inflation lead to?
One of the key parameters that influences the car's behavior on the road is tire pressure. It is especially important to monitor it in winter, when weather conditions can significantly affect road grip and driving safety. In this article, we will analyze how the level of tire inflation affects the car's handling, how to measure the pressure correctly, how often to do it, and what consequences ignoring this indicator can have.
How to measure tire pressure?
To control the pressure in the tires, you will need a pressure gauge - a compact device that allows you to accurately determine this parameter. There are two types of pressure gauges:
- Analog – reliable and inexpensive, but require an additional power source.
- Digital – more accurate, powered by batteries or accumulators, but more expensive.
The measurement process is simple and takes only a few seconds. You need to insert the pressure gauge connector into the tire valve, slightly releasing the air. In an analog device, the arrow will show the pressure value, and in a digital device, the data will be displayed on the screen.
Some drivers believe that they can determine the tire pressure by eye, but in practice, deviations can only be visually noticed if the difference from the norm is 30% or more. A lack of pressure of 10–15% is not noticeable even by touch. Therefore, specialists Bestrental It is recommended to check your pressure at least once every 1–2 months and definitely before long trips.
What units are used to measure pressure?
Different countries use different units of measurement:
- In Ukraine and Europe - bars (BAR) or atmosphere (ATM) (1 BAR ≈ 0.98 ATM).
- In the US and UK - PSI (pounds per square inch), where 1 PSI = 0.068 BAR.
- Some manufacturers also use kilopascals (kPa) (1 kPa ≈ 6.8964 PSI).
This information is useful if you are comparing vehicle manufacturer recommendations or using foreign tire pressure testing equipment.
The Effect of Tire Pressure on Vehicle Performance
Many drivers underestimate the importance of correct pressure, but it significantly affects:
- Fuel consumption – incorrect inflation increases rolling resistance, which leads to excessive fuel consumption.
- Tire wear – if the pressure is insufficient, the sidewalls wear out more, and if the pressure is excessive, the central part of the tread wears out more.
- Controllability – when tires are flat or over-inflated, the car responds less to the steering wheel, especially on slippery roads.
Let's look at how different pressure levels affect the operation of a car:
- The tire is deflated to 65% - noticeable to the naked eye. You can drive no more than 1-2 km, otherwise the disk will start damaging the rubber.
- Insufficient pressure on 25–60% – it is dangerous to drive on asphalt, the tire may come out of the rim during a sharp maneuver. However, off-road this can be an advantage – in loose snow or mud, slightly deflated tires provide better grip.
- Underpumping on 10–15% – not critical, but reduces controllability, increases fuel consumption and accelerates tire wear.
- Normal pressure – ensures optimal contact with the road, even tire wear and predictable vehicle behavior.
- Transfer to 10–15% – makes the car less comfortable, worsens grip, but improves the performance of studded tires.
If the pressure is incorrect, water and dirt are poorly removed from under the wheels, increasing the risk of aquaplaning.
Optimal tire pressure: what influences its level?
The degree of tire inflation is influenced by several factors:
- Air temperature – for every 8°C increase in temperature, the pressure increases by 0.1 BAR.
- Load distribution – front and rear wheels may require different pressure.
- Car occupancy – the more passengers and cargo, the higher the pressure should be.
- Tire size – but the tire radius is not a critical factor.
Manufacturers indicate the optimal pressure values on a special plate inside the car - on the driver's door or the gas tank flap.
It is better to measure blood pressure at cold tires, when the car has been parked for at least 2 hours. For heated tires, the readings may be 0.2–0.3 BAR higher.
How does temperature affect blood pressure in winter?
If you check the pressure in a warm room in winter and then go outside, the temperature difference can be about 20°C. This will lead to a decrease in tire pressure by 0.2–0.4 BAR. Rent a Car. In this case, the car will become softer on the move, but braking and acceleration will require more time.
In summer, the situation is the opposite: due to the heating of the rubber and friction against hot asphalt, the pressure increases. At extreme temperatures, it can increase so much that the tire will burst even from a small impact against a curb or stone.
The influence of wheel radius on pressure in winter
Many motorists believe that the radius of the tires significantly affects the optimal pressure, but in practice this is not the case. For example, for Nissan Qashqai The pressure in the front tires should be 2.3 BAR, regardless of whether the 16th, 17th or 19th wheels are installed. In the rear tires, the indicator is 2.1 BAR. When fully loaded, the pressure increases to 2.6 BAR.
The same applies Toyota Corolla – for wheels with a radius of 15 and 16 inches, the standard pressure is 2.2 BAR, and at full load it increases to 2.5 BAR.
Conclusion: the tire radius is not a decisive factor, and you should be guided by the manufacturer's recommendations.
Pressure in winter studded tires
Research shows that tire pressure levels affect how a car performs on ice:
- When the pressure drops to 1 BAR – accelerates 10% longer, and the braking distance increases by 2 m.
- When the pressure increases to 3 BAR – the spikes dig into the ice better, increasing grip.
Over-inflation reduces the contact patch but enhances the effect of the studs, which is useful on icy roads.
Consequences of incorrect pressure in winter tires
If the driver does not monitor the tire pressure in winter, this can lead to:
- Increase in fuel consumption – due to increased rolling resistance.
- Rapid wear of rubber – and the need to replace tires ahead of schedule.
- Loss of control – which is especially dangerous on icy roads, as it increases the risk of skidding and accidents.
To avoid these problems, check your pressure every 2-4 weeksIt will only take a few minutes, but will ensure safe and comfortable driving, and will also help save money on fuel and tires.
Monitor your tire pressure - this is a simple but important aspect of car operation that will help save your money, nerves and safety on the road!