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Truck Tyres Michelin initiated almost every significant technical development in tyres. It turned the concept of the pneumatic tyre into a practical, production proposition and led the way in applying such concepts first to bicycles, then to motor cars and eventually trucks. In 1908, Michelin combined the pneumatic tyre with the twinned wheel/tyre arrangement to enable trucks to carry heavier loads without resorting to multiple rear axles. By 1962, Michelin had developed the first tubeless steel-braced radial truck tyre together with a one piece wheel, which replaced the former wheel assemblies with up to six components and also achieved a significant saving in unsprung weight. From one percent of the market in 1965, tubeless penetration grew to 75 percent in 1987. From 1976 onwards Michelin developed low-profile tubeless truck and light truck tyres (80, 75, 70 and 65 per cent aspect ratio). The move to low-profile has created space within the wheel rim for better brake cooling, an important factor as permitted weights and average speeds continue to increase. Low-profile developments include the wide single radial which has increasingly replaced twin wheel and tyre units in trailer applications and more recently on drive axles. Tyre designers continue to seek ways of improving the overall performance of truck tyres, a task that represents a constant challenge.
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