You know you should check your tyre pressure regularly, but why?
Correct tyre pressures mean that your tyres grip the road as they should.
Incorrect tyre pressures can cause unnecessary wear on your tyres which means they could wear unevenly or even need replacing prematurely.
Low tyre pressures can mean that your tyre creates more resistance to movement, this means that more energy is required to move your car meaning higher fuel consumption. Which means that maintaining your tyres at the correct pressure could help save you money on fuel and reduce the amount of CO2 you produce from your vehicle.
Why does my tyre lose pressure?
The composition of a tyre means that gas and moiture inside the tyre will seep out - rubber is a porous material. Compressed air contains oxygen, water and nitrogen in different mixes. A tyre filled with compressed air will lose around 1 psi per month.Why Nitrogen?
Molecule size & Pressure Temperature Moisture
Nitrogen molecules are slightly larger than oxygen and so seep out of the tyre about 3 - 4 times slower than compressed air. This means you will see a decrease in pressure of around 1psi every 5 months. Therefore, inflating your tyres with nitrogen means that the tyre pressure will stay correct for longer.
Temperature
When the temperature of rubber in a tyre increases the water vapour found within the air inside, the tyre reacts and causes the rubber to expand. Temperature change has little or no effect on pure nitrogen molecules as it contains no water vapour. This keps the tyre pressure constant when in motion and ensures the correct amount of tyre is in contact with the road.Moisture
Compressed air within tyres contains water vaour. Over time, this can cause the inner wheel rim to rust. Nitrogen contains no water vapour and prevents this rust build-up. In a passenger car, the effects of this aren't seen until after many years; the effects of moisture content are more important to commercial vehicles.In order to get the optimum performance from your tyres, the nitrogen content in your tyres should be above 95%.
At ATS Euromaster, the equipment we use purges your tyres of the current gas (deflates them) and re-fills them using nitrogen. This is done on all 4 tyres at the same time and takes a matter of minutes.
The machine we use takes the nitrogen from the air, cleans it and then uses it to inflate your tyres. Once you have nitrogen in your tyres, ideally you should keep the pressure topped up using nitrogen, but we know this may not always be possible. If you need to top up using compressed air, this is fine but it will dilute the nitrogen content in the tyres. This will affect the operating efficiency of your tyres as to get the maximum benefit you need to keep the nitrogen content above 95%, but will ensure you have your tyres at the correct pressure until you can re-inflate with nitrogen.
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