Classification Of Tires
Posted on January 18, 2010
Filed Under Interesting, Winter Tires
Diagonal and Radial Tires
The carcass of diagonal tire consists of a certain number of rubberized cord plies the edges of which are twisted around wire circular bars (they enable the mounting of the tire on a wheel). All threads of the carcass and breaker cord are intersected in adjacent areas. The angle between carcass and breaker cord usually equals 45o – 60o. There are usually four adjacent areas. The design of diagonal tires is outdated but they are still produced (usually for old models of cars) as their production is comparatively cheap. Besides this, their carcass is more resistant to damage in case of strokes or cuts.
Radial tires (R type) all carcass cord threads are situated radially parallel from one bead to the other. The breaker cord threads are placed the same way as in diagonal tires but at a higher angle. Such design makes the carcass not strong enough to endure cornering and acceleration loads. That’s why it has to be supplemented with other tire elements. The carcass is usually reinforced by dual steel belt or is stabilized with nylon band.
Summer And Winter Tires
Summer tires usually have distinguished circumferential grooves that withdraw water from the contact patch, shallow lateral grooves and the absence of micro pattern. Besides this they always have rounded shoulder area.
The tires of such type provide maximum traction on dry and wet surface, high treadwear resistance level and perfectly suit for speedy driving. But they are not intended for off-road conditions (especially when the surface is wet).
Winter tires are used for the operation on ice- and snow-covered surface. The traction performance of such tires may vary depending on the situation, from minimal (smooth ice or slush) to average (snow-covered surface). The tread pattern of such tires has independent tread blocks as well as deep circumferential and lateral grooves. The blocks have special pattern to increase the lateral operating area.
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