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  • How does tyre pressure determines the safety and mileage of a vehicle?

    Have a query regarding the impact of tyre pressure pressure in bikes and vehicles on the ride? Looking out for detailed information? You can find responses from experts on this page for all your queries.

    All the vehicles or automobiles with tyre need air with a certain pressure to have a smooth ride. What are the consequences of low and high tyre pressure in bike or car or any other automobile running on the road? How does tyre pressure determine the safety and mileage of a vehicle?
  • Answers

    9 Answers found.
  • Initially the air pressure of tyre depends on:-
    1. Size of the tyre.
    2. Number of tyres for that particular vehicle.
    3. The load on that vehicle.

    If the air pressure of the tyre is low:
    1. The life of tyre will be reduced as it depends on load. The rubber and nylon thread used in making a tyre will be woren out while plying. Replacement will lead to leavy unexpected expenses.
    2. The consumption of fuel will be more than regular usage.
    3. The mileage will reduce.

    If the air pressure of the tyre is high:-
    1. The tyre will burst while plying leading to accidents. The tyre bursts at an unexpected time. This leads to waste of time, in changing the tyre and unexpected expense in buying a new tyre.
    Normally, Nitrogen gas filled in tyre will give more life for tyres. Tubeless tyre also is cost-effective.

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  • We will be seeing many automobile accidents. Many of these accidents will be due to man-made mistakes only. Defective tyres were the most important factor in many of these accidents. Almost two thirds (65.1%) of accidents are due to tyre problems only.
    If the tyre is having the correct required pressure, the weight of the vehicle will evenly get distributed across the tyre. This will make the vehicle as well as the tire stable. If the tire is over-inflated or less will affect the handling, cornering, and stopping of the vehicle. The tire wearing will also be uneven. This will eventually lead to unwanted incidents.
    Over-inflation will reduce the cushioning power of the tyres. They will have a high risk of impact, penetrations, and abrasions. Road-tyre contact will become less. Centre tread wear will also increase.
    Under-inflation causes will result in overheating, and casing break-up and tread separation. This is the main reason for a tyre blow out.
    The lifespan of the tyres will be better when you use correct air pressure. 0.5 to 1 bar, a decrease in the tyre pressure will reduce the tyre life by25%. Less trye pressure will increase fuel consumption and fuel efficiency will come down.

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  • Tyres remain in contact with the ground and offers very important function of carrying the load. Compressed air filled inside the the tyre coupled with the load of the vechile determines the overhaul vechile weight. Tyres being porous in nature looses inside air even on its state of its static condition. The tyres should be niether under inflated or otherwise but it should maintain the correct pressures in all the tyres.
    If the tyre does not have enough air, it may be termed as under inflated. If the level of air inside the tyre goes below the level of 25 percent, it signifies the warning level. Severely under inflated tyre would correspond to 0.5 Bar or 7.25 psi or even less than the pressure indicated above.
    Moderate underlined tyre pressure would signify the range between 20 and 49 KPa.
    The recommended tyre pressures can be found on tyre in the manual book provided by the manufacturers.
    Substantial deviations in respect of pressure would negatively affect tyre physical properties. Due to the deviation of pressure, the following issues may manifest-
    1) Excessive Tyre Wear - Excessive wear on the central part of the tyre would reflect that pressure is appreciably higher than the recommended pressure. This would result in less mileage.
    Excessive wear in the shoulder area indicates that the tyre is under inflated. Under inflation can lead to excess tread wear coupled with tread separation. An under inflated tyre can reduce mileage by 20 percent which otherwise it could have offered.
    2) Tyre Damage -
    Flexing and heating of under inflated tyre is greater and this can accelerate the internal damage of the tyres leading to failure of tyres.
    Excessive load coupled with under inflation can lead to flexing of the tyres leading to tyre damage. Therefore tyre pressure should be adjusted depending upon load.
    Maintaining proper tyre inflation pressure is crucial because it can control numerous tyre performance following safety and environment aspects. The following parameters will improve with the correct tyre pressure such as Handling, Braking, Tyre - wear, Tyre - durability, Tyre Rolling Resistance, Fuel Consumption, Ride Comfort etc.

  • While I was filling the air into the tires of my scooter, my eyes captured a diagram painted at the kiosk of the air station which mentioned that over pressure tyre and under pressure tyre would cause problems to the driver. While the over pressure tyre has the chance of skidding and also makes lots of sounds while going through the gravel road. Likewise the under pressure tyre would slow down the vehicle and give more thrust on the vehicle engine thereby we are forced accelerate the gear for raising the speed and that gulps the petrol. That is the reason being so a under pressure tyre is not advisable and it will empty the petrol tank soon.

    K Mohan
    'Idhuvum Kadandhu Pogum "
    Even this challenging situation would ease

  • This is really a good query which may help people know the facts who own vehicles. Below are the consequences of low and high tyre pressure in bike or car or in any vehicles:

    1. What happens if air pressure is low or too low:
    When the air pressure in the tyre is low or too much low then too much of the tyre's surface touches the road which increases the frictional force between the tyre and the road. In result, speed will slow down of bike or car or any vehicles.
    The major risk is wheels of vehicles could overheat which could result in tread separation and accident. In order to avoid such mishappenings, you should check the air pressure and make sure the load on vehicles are accordingly.

    2. What happens if air pressure is high or too high:
    When air pressure in the tyres are high or too high then the tyre's surface touches the ground very less and as a consequence, your vehicles will start bouncing on the road. Even you will feel discomfort in riding or driving the vehicles.

    Below are the info of what would be the perfect air pressure for your vehicles:
    1. Bike: A proper tyre pressure in both the wheels lets your bike roll quickly and gives you a smooth ride. Generally, the tyres come in narrow and wide ones, where a narrow tyre needs more air pressure than the wide one. Road tyres typically require 80 to 130 psi(pounds per square inch), mountain tyres 25 to 35 psi, and the hybrid tyres 40 to 70 psi.

    2. Car: Recommended pressure range is between 30 and 35 psi. The best practice is to look at your manufacturer's recommendations. This will be printed on the label inside your car.

    All vehicles manufacturer companies share this information on the label.

  • Tyre pressure in the tyres of a vehicle is a crucial parameter and it has to be maintained as per the vehicle manual and manufacturer's recommendation. Some people are not aware about the importance of tyre pressure and run their vehicles even with reduced pressures but it can wear and tear the tyres much earlier than their life. So, we must be alert and cautious on this account.

    We should get the pressure in the tyres checked frequently and top up the pressure if it is reduced or reduce it if it is more due to some error at the air filling station. It is a good practice to get the air in tyres checked at least in 15 days time. If the tyres are in a good condition and air pressure is maintained and the vehicle is well maintained then in ideal cases there is a very small reduction in the tyre pressures over the time and as a general rule about 1 psi is decreased in one month. The tyre pressure in our cars is generally in the range around 30 psi. So 3-4% drop in one month is very nominal and if the tyre pressure drops more than that then it might be a small puncture or valve leakage in the particular tyre and one should get it checked by the mechanic. Another important thing is that we should always check the tyre pressures before commencing the long drives because due to the temperature increase the pressure readings would increase and measurement taken after the journey would be deceptive. It is also advised to keep the pressure by 1-2 psi units less when going for a long drive to keep margin for air expansion with temperature rise.

    There are many factors that are to be considered in this 'correct tyre pressure' matter. An incorrect pressure in the tyres can lead to the early wear and tear, it can lead to unexpected accidents, it can affect the fuel efficiency as the reduction in pressure is always associated with increased frictional forces on the roads which causes excessive drag on the vehicle. Actually an expert driver would easily find out from the drag on the vehicle that the tyres are having incorrect air pressure.

    Over inflation of tyres is equally bad as that of under inflation as it makes the vehicle more prone to imbalances and susceptible to impacts. Tyres are designed for an optimal air pressures and any deviation would impact on the overall wear and tear of the vehicle and not only on the tyres. One important thing in this matter is that every vehicle has a spare tyre in it and it makes sense to keep it inflated properly for any emergency. So, whenever we are checking the tyre pressures it is desirable to get it checked also.

    Let us remember that tyres are the only physical connection of our vehicles with the road and their optimal contact with the road surface is crucial for good mileage of our vehicles. So, maintaining proper air pressure in tyres is a pre requisite to achieve that result. Keeping the correct pressure in tyres helps in achieving the optimal mileage from our vehicle.

    Knowledge is power.

  • Though I do not know about vehicles, in our body the pressure of blood motion is expected to a certain level. If the level is maintained our body is found in good condition and can live long with hale and healthy and without any bodily trouble. If the pressure is over we can medically say high pressure and need medical care as our body reveals the same with symptoms similarly lower pressure also. So the normal specified pressure is expected to keep ourselves for a good health. I believe the same principle is also adapted in vehicle tyre pressure also.

  • Tires are often a big asset when it comes to the performance of a vehicle. Tires are the only point of contact with the road and it can affect the control of the driving. When we go for tires, it is better to understand a few things and thus we can improve the performance of the car. Some of the few tips are as follows.
    1. Diameter
    2. Tread Depth
    3. Rigidity
    4. Width
    5. Pressure

    1. Diameter:

    When we shop for the tires, we need to look for the diameter of the wheel, because Diameter is the primary number which is listed to buy. For example like 15, 16, 17 etc. Most of the people do not know what wheel diameter stands for and how it can affect the performance of the vehicle. When we have large wheel diameter, we will get more stability which gives to drive at a fast speed as well as better stopping power.

    2. Tread Depth:

    When we have thicker tread it can better go through snow, mud and water and it can help a role in traction and braking. When we have a thick tread with wide grooves it can manage difficult driving conditions and our car can maintain traction and we have lower chances of spinning out of control. The thicker thread gives good traction and it can increase the stopping time. The car can grip the road and we can apply the brake properly according to the emergency situations and avoid obstacles.

    3. Rigidity

    There is a rubber in tires and it can become softer or harder one. The softer tires can grip the road better which gives more traction and thus increases the braking. The softer tires will wear down faster and will be more vulnerable to gravel and potholes. Harder tires will not give much traction and it will stand better in tough driving conditions while we drive at top speeds or drive in rough terrain. It is better to take a tire which gives a good range of features to meet according to driving conditions.

    4. Width

    Wider the tire, we will get more traction and gives more performance and in all the cases it cannot be true. The width of the tire is according to suspension. When we don't have a modified suspension, wider tires will have the potential to make the car less safe by making harder to handle. Sometimes we can see that it is harder to steer and our wheels can react according to changes in the road and sometimes it can get out from our hands while driving. When we buy for wheels, it is better to give attention to the scrub ratio of the car.

    5. Pressure

    When compared with the fuel efficiency of the car with the tire pressure, the pressure of the tire needs to give more attention because insufficient pressure can lead to the bad performance of the car. When a tire is not properly inflated the tread can collapse and we will not be able to drive in difficult conditions. When we have good tire pressure, we will get good control, otherwise, we will have to drive slowly to get some control. Over inflating, tires can also become a problem. Tires which are full will not be able to bend more and it makes less flexible when we encounter with bumps in the road.

    The tires which we choose for our car can have a good impact on the way which it looks and how much it will cost for it. The tires characteristics will give our car a good performance. Good tires can make our drive safer while we are driving with our family.

    "Earning knowledge is by sharing it with ISC and we will rectify our mistakes."

  • Cars tire pressure is determined by the pounds per square inch (PSI). One PSI drop in car tire pressure can lower oil mileage by 0.4%. So we need to check and keep the car tire pressure according to the car manufacture guidelines otherwise it will affect our whole budget. As the oil prices are increasing these days.

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