
Road Safety Foundation warns about Tyre Pressure
Have you ever wondered what causes the huge amounts of tyre debris one sees lying on or alongside our South African roads? It seems that wherever you drive these days, bits of tyre, partial or even complete casings have become a common occurrence. Bridgestone South Africa tasked the Road Safety Foundation to look into this increasingly emerging phenomenon, in an attempt to ascertain the cause.
Bridgestone General Manager, Group Public Relations, Romano Daniels comments that tyre technology has improved substantially over the years, and whilst South Africa has recently started importing cheaper, and sometimes sub-standard tyres into the country, he doesn’t believe that this could possibly be the only factor in this apparent increased tyre failure.
A blowout of a tyre can be caused by a number of factors, however more often than not; incorrect tyre inflation is the cause. And here is where it really starts to get interesting! You and I as motorists, check our tyre pressures occasionally (often only when we remember, or if we’re on a long trip), more often than not at various petrol stations depending on when and where we require fuel. The pump attendant will fill your car with fuel, clean your windscreen, and offer to check your vehicles oil, water and tyre pressures.
The tyre pressure gauges that are utilized on the forecourt to measure your tyre pressures are often hopelessly inadequate. As part of the Bridgestone National Tyre Index a research study was conducted by The Road Safety Foundation, in which 91 different forecourt tyre pressure gauges were checked for accuracy. A tyre inflated to 2.0 bars was placed in the load area of a vehicle – this was done so there was no heat build up which would occur if the tyre was fitted on the car. A calibrated gauge was used to set the tyre pressure, and the same gauge used to record all subsequent readings. In addition, altitude was also recorded as the testing took place over a large geographical area.
Results of the research indicated that only 48% of gauges tested gave acceptable readings, 5% were not operational, 29% produced marginal readings and 18% recorded potentially life-threatening and totally unacceptable readings. Almost one in five tyres tested at our filling stations, would result in incorrect, and therefore potentially hazardous pressures.
To put this dangerous issue into perspective and taking one of the pressures that were recorded, if a reading of 2.6 bars was the reading at the pump, and pressures were then reduced to manufacturers specification of 2.0 bars, the actual pressure in the tyre would be in the region of 1.4 bars! Under-inflation of tyres, according to Bridgestone, is arguably one of the main contributors to tyre failure and blowouts and often results in major accidents.
Currently, there is no legislation in South Africa regarding testing, calibration and maintenance of these tyre inflators, some of which we know have been in operation for more than fifteen years with very little maintenance.
So what are the options for the South African drivers, accepting the fact that introducing legislation may take years? The opinion of Bridgestone South Africa and The Road Safety Foundation is for motorists to purchase a good quality tyre gauge from a reputable spares outlet and to set tyre pressures using this gauge. Another couple of important tips regarding tyre pressures, is always check pressures when cold, and refer to the vehicle manufacturer’s recommendations when carrying heavier loads.
[Information provided by Road Safety Foundation and Bridgestone]
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