(under subclass 143) Apparatus wherein the device to change or regulate the tensile stress in the endless band is provided within the device such as a circular disk or a circular rim with a hub, capable of rotating on a central axis and solely used to reverse the direction of rotation or to modify the spacing of the centers, without affecting the overall ratios of the drive. [figure] [caption]A - Vehicle chassis; B - Endless track; C- Track shoe; D - Drive wheel; E - Idler wheel; F - Idler-wheel carrier; G - Support body; H - Tension adjustment device; J - Track roller; K - Beam; L - Pin; M - Empty space
