tyre for motor vehicles designed to carry out assembly can quickly was the rapid transformation from a normal four seasons in spiked to ice and snow, and by means of specifly equipment function and command mounted in the tyre and the vehicle.apparatus including a multiple of cilindretti and tumblers controlled pneumatically or electromagnetically embedded in the tire, a set of link for driving.a compressor installed on board with pressure gauge, in the case of operation with compressed air, and a command button on the dashboard, with the air, in this casethe exit of the pins or nails is achieved when the pressure exceeds the value of gonfiaggio normal tirethe condition that determines the failure of the spring mounted in each calibrated against plungerspring as soon as the greatest pressure is reduced to normal will making the pins returning to normal tire characteristics.
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