SAVING TIRES
EFFECT OF HIGH SPEEDS DAMAGE THROUGH BRAKING FAULTS IN INFLATION CARE. The appeal to conserve tires by using motor vehicles at a moderate speed is being disregarded by a considerable section of drivers and it would appear that the imposition of a general speed limit may be a necessary discipline. Because the traffic density has been greatly reduced through the rationing of petrol the tendency of many drivers is to increase speed outside the narrow zones of the 30-mile-an-hour limit. The inevitable result is increased wear on tires, not only through ordinary friction, but also because speed leads to sharp braking. On any concrete road can be seen the black marks caused by tire rubber having been scraped off when a vehicle has been suddenly slowed from a high speed. Quick acceleration and deceleration shorten the life of tires, and this combined with speed is ruinous. PROPER AIR PRESSURE. Another cause of rapid tire deterioration is neglect to maintain a proper standard of air pressure. It is the opinion of Mr G. P. Robertson, engineer to the Auckland Automobile Association, that the tires of light cars which are most commonly used nowadays should never have a pressure of less than 301 b. He recommends pressure even exceeding the figure laid down by some manufacturers. The soft tire may give a soft ride, but that means a shorter life for the tires. There is in Auckland a 10 h.p. car which has travelled 28,000 miles on one set of tires, which are still in good condition with the spare almost unworn. This is the direct result of the constant maintenance of a pressure of 301 b. PARKING AGAINST KERB. Cornering at speed is another serious cause of tire destruction, as also is the parking of cars against a kerb on a slope with the edge of the kerb biting into a tire. This fault is not so common as it was in Auckland, but it is still observed. What happens is that the pressure of the edge of the kerb bursts the cords of the lining and. thus causes the casing to collapse at the point of damage. Another fault is that of over-loading small cars, particularly when tires are not sufficiently inflated. Speeding, however, is the most common cause of tire destruction, to say nothing of its high demand upon petroL
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Wairarapa Times-Age, 2 June 1942, Page 3
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393SAVING TIRES Wairarapa Times-Age, 2 June 1942, Page 3
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