invention tire tread ground vehicle operation within the lateral force and remedies for the device to measure the change of power to , and more particularly, to a laser light into the optical fiber and measures the acceleration of the tire and lateral force variations and change measuring device of the tire caused during the cornering of vehicle operation for measuring the lateral force and the relief force, which occurs in a tire using this. ; is the lateral or longitudinal direction to the running direction of the tread (2) the acceleration within the adding unit 3, the optical fiber 4 the tire 1 is attached to the tire 1 during running is for this purpose is attached to a plurality in the tread (2) , the optical fiber 4 , there is a distributor (6) and the structure consisting of a phase difference comparator 7 is connected is connected to the laser light source (5).
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