VEHICLE TYRE DEFORMATION DEVICE

A vehicle tyre deformation device for determining the size of a deformed contact patch of a tyre which contacts the ground, said device comprising a movement detector connected to an attachment body by means of a moveable indicator element wherein both the movement detector and the attachment body are attachable to an inside surface of the tyre, and wherein the size of the deformed contact patch of the tyre is determined by the detector sensing a change in angle of the moveable indicator element indicating the border between the deformed contact patch of the tyre and a non deformed part of the tyre which is not in contact with the ground.