tyr nitrogen filling seminar ,powerpoint representaion, with references

tyre inflation pressure guide

Did you realise that your car is literally riding on air? The pressure of the air inside your tyres is what supports the entire weight of your car! A tyre is a ring shaped covering that fits around your wheel rim. It is in constant contact with the road and is made of absorbent materials so it can help absorb shock and provide grip. Pneumatic tyres are inflated with air, and the amount of air in a tyre can affect its performance dramatically.

At JAX Tyres we strongly recommend that you check your vehicles tyre pressures regularly! (including the spare). Pressures should be checked cold, as there is an increase when the tyre has warmed up after being driven.

How much should you inflate your tyres?
All car manufacturers will have guidelines for the ideal inflation of your car’s tyres. This is usually expressed in terms of pressure, and most cars still have this information supplied in both metric and imperial, as do most air pumps at service stations. Your vehicle will have the correct tyre pressures displayed on a tyre placard. Be careful to read the fine print of the placard as most vehicle manufacturers recommend minimum tyre pressures. You will typically find the tyre placard either just inside the door, the filler cap or in the glove box. The vehicle manufacturer has designated the ideal tyre inflation based upon any conditions which the car is likely to face (number of passengers and load weight, for example), and maintaining this ideal pressure with regular checks will ensure you have the best ride and you will achieve the greatest longevity from your tyres.

But what happens if you over or under inflate your car’s tyres?

Over inflated tyres:

Have a smaller contact patch with the road
Will decrease rolling resistance and could therefore improve fuel consumption
There may be an effect on braking
Tyre wear may be greater in the centre of the contact area
Compromise handling, ride comfort and tyre noise
Under inflated tyres

Under inflated tyres have a greater contact area with the road
This can increase rolling resistance and friction (the rubbing together of two moving objects) from tyre against road.
Increased friction is bad for overall efficiency, and increases fuel consumption
Can also create greater tyre wear and adversely affect performance. Increased friction causes tyres to get hotter, and the shape of under inflated tyres means that the shoulder of the tread wears faster
Put extra stress on the casing and reduce tyre life
Will adversely effect braking performance


Clearly checking tyre pressure and making sure it is at the recommended level is of benefit to your pocket and overall safety and driving enjoyment.

How often should you check tyre pressure?
Tyre pressures should be checked once a fortnight, or at a maximum at least once a month, when the tyres are cold (not having been run). Inflating your tyres with nitrogen will mean that you need to do so less often. If you select to inflate your tyres with nitrogen gas, JAX Tyres will inflate your tyres throughout their life without any additional charge. When nitrogen is used, top ups must always be with this gas to ensure the many benefits offered. Therefore, topping your tyres up with compressed air must be avoided.

Another important tip to remember is to never bleed pressures when the tyres are warm. It is dangerous to drive on under inflated tyres, as vehicle handling may be adversely effected, and excessive flexing and heat build-up may result in tyre failure.

The Advantages of a more stable tyre pressure include better grip, increased fuel economy and tyre life.

One of the best ways to achieve a more stable tyre pressure is through the JAX Tyres N27 Nitrogen Programme. Tyres may also be inflated with nitrogen rather than air, which is mostly nitrogen and about 20% oxygen. Air delivered from a compressor also contains moisture. Nitrogen gas is inert which offers greater protection to the tyre and permeates through its casing at a slower rate when compared with compressed air. This will ensure that your tyres retain the correct pressure for longer periods and as a consequence offer increased life.

Tyre Pressure Guide
Contrary to popular belief, tyre pressure is not determined by the type of tyre or its size but
upon your vehicle's load and driving application i.e. speed
To find out what your car's tyre pressure should be, consult the manufacturers tyre placard usually found inside the driver's door sill, glove box, fuel filler cap or under the bonnet.
The placard also displays the manufacturers recommended tyre sizes.
Tyre pressures should be checked when the tyre is 'cold', as pressure increases as the tyre becomes 'hot'.
Take the "cold" reading and check them against the recommended tyre pressures from your placard.
Heavy loads or towing puts an extra strain on your tyres. So if your vehicle is fully loaded with passengers and luggage, the general rule is to add 28kpa (4PSI or 4lbs).
At high speed, (defined as driving at 120km/h for over one hour), your tyres will wear out twice as fast as when you drive at 70-80 km/h. If your tyres are under-inflated by twenty per cent tyre life can be reduced by thirty per cent. The rule here is to add 28Kpa (4PSI) from your Minimum Compliance Plate Pressure. Don't inflate your tyres above 40 psi or 280 kPa. When the tyres get hot from driving, the pressure will increase even more.

Believe it or not, checking your tyre pressure can have a big impact on our environment. An under-inflated tyre creates more rolling resistance and therefore more fuel consumption. By keeping your tyres inflated to their proper levels, you can help maximise your car's fuel economy and minimise its impact on our environment.