Green tyres, fuel savings, CO2 emission - 71 % of motorists drive on under inflated tyres.
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71 % of motorists drive on under inflated tyres.

Environment Published the 08/04/2011

A recent study carried out in Europe by the manufacturer Bridgestone, has demonstrated that 71% of motorists drive on under inflated tyres. This is a worrying state of affaires not only in terms of safety, but also the environment.

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A veritable safety issue

A tyre is developed to function at a particular pressure level. When tyre pressure is too low, the behaviour of the tyre is not optimal. The excessive forces that are applied to the shoulders of the tyre can potentially create problems with grip, over heating and premature wear.

Furthermore, Bridgestone declares that 12% of tested vehicles were fitted with tyres displaying wear that was over the legal limit.

Environmental consequences

A tyre that is not inflated to the recommended pressure suffers a significant rise in rolling resistance and this is a paramount factor in a vehicle’s fuel consumption. In effect, the rolling resistance represents between 18 and 26% of the total force of the vehicle. Consequently, when a tyre is under-inflated, there is an immediate impact on fuel consumption.

Bridgestone estimates that over the course of a year this leads to unnecessary fuel consumption of 2 billion tonnes, costing 2.8 billion Euros. For the environment, this means a surplus of 4.8 million tonnes of useless Co2 emissions. This amounts to 1.8g/km by motorist.

Key figures:
> Study carried out in 9 countries
> 38,000 vehicles tested
> 7.5% of motorists tested were driving with pressure 0.5 bars below the recommended level
> 0.5% of motorists tested were driving with pressure 0.75 bars below the recommended level
> 12% of motorists tested were driving with worn tyres
> 2 billion tonnes of fuel wasted every year
> 4.8 million tonnes of CO2 uselessly emitted every year