The invention relates to a
shock absorber, in particular for wheeled vehicles, comprising a cylinder (1) filled with a fluid and a
piston rod (3) guided in said cylinder, wherein the
piston rod (3) is led through the cylinder (1) and is provided with two pistons (41, 42) spaced apart from one another, in which axial bores (413, 423) are formed all around at a radial distance from the
piston rod (3) and on the outside of each of which a closure disk (40) for closing the axial bores (413, 423) in the associated piston (41, 42) is mounted on the
piston rod (3) for axial movement, and wherein the cylinder inner wall has, at least in parts, a
diameter which changes continuously in the axial direction. The invention also relates to a wheeled vehicle having a
shock absorber of this type.