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Off-road car tires -- cross-country cars are the front and rear wheels. Main driving cross-country car tyres in bad road, such as desert, muddy ground, loose soil or other no pavement road, urging tire has high performance and off-road tires tend to use low pressure, sometimes with pressure regulating tire, according to the road condition to adjust the size of the tire pressure. In order to improve the cross - cross section, it is generally used to increase the width of the tire section and rim and reduce the diameter of the rim so as to increase the grounding area and reduce the grounding pressure. The tyre structure is also used in the structure of the meridional structure
Wide provided suitable for busy trunk, also can be laid in tunnel and station floor maintenance difficulties, stone or soil subgrade are laid, but the mud pumping in the diseases of roadbed must be laid on the roadbed diseases after renovation. The main advantages of the wide sleeper circuit are: the suborbital sinking is small. The vibration acceleration is smaller than the concrete sleeper line, which gradually slows down and stops after laying. So the line maintenance work is greatly reduced, about a third of the general concrete sleeper line. The track is easy to keep clean. Dirt is not easy to break into the bed and prolong the repair cycle of the route. The line is smooth and stable, which is conducive to high-speed operation and the laying of seamless circuit. The disadvantage is that the cost is higher, and it is more difficult to change the shop on the busy trunk line
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