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Dpwh highway safety design standards manual
Dpwh highway safety design standards manual









American car manufacturers were afraid that the cost to redesign their cars in order to use these radial tires was too much and so stuck to the older bias ply tires. This new radial tire was very successful outside of the US, with companies in Italy, France, Japan and Germany producing them in large numbers. One drawback was that these tires required a different suspension system on the vehicle. It also meant that the tire had less rolling resistance – increasing the mileage of a vehicle. This new type of pneumatic tire meant that they would have a longer life thanks to ply cords that radiate from a 90 degree angle from the wheel rim. Tires remained fundamentally unchanged throughout the 20’s and 30’s until Michelin introduced steel-belted radial tires in 1948. All over the world companies sprang up to meet the new demand for the new tires. It was also around this time that legislation was put into effect that discouraged the use of solid rubber tires. In 1895 the pneumatic tire was first used on automobiles, by Andre and Edouard Michelin. With that victory, people began to take notice of the pneumatic tire. Dunlop’s tire, like Thomson’s, didn’t seem to sell at first - until a bike race in Belfast was won by a rider using his tires. It wasn’t until 1888 that John Boyd Dunlop, unbeknownst to him, reinvented the pneumatic tyre whilst trying to improve his son’s bike. However, despite this new breakthrough in tires, the old solid rubber variety was still favoured by the public, leaving the pneumatic tire out in the wilderness. This meant that it would take more than one puncture before the iyre deflated. His design used a number of thin inflated tubes inside a leather cover (see illustrated). It was in 1845 that the pneumatic or air-filled tire - which works by air within the tire absorbing the shocks of the road – was invented and patented by RW Thomson.

dpwh highway safety design standards manual

They were simple tires the rubber carried the load entirely. It was in the mid 1800’s that the first tires made using rubber appeared. Luckily, with the discovery of rubber things changed. The very first tires were bands of iron placed on the wooden wheels of carts and wagons.











Dpwh highway safety design standards manual