Length-adjustable tube, in particular for sticks

A length-adjustable tube, for sticks including ski poles, trekking poles, cross- country poles and Nordic walking poles,

• said length-adjustable tube having at least one outer tube and one inner tube which is telescopically insertable into the outer tube for adjusting the tube length,
• and having an expanding device which is held at the insertion end of the inner tube and by way of which the inner tube is axially clampable in the outer tube and which
• comprises an expanding element, which can be pushed apart radially and is provided with a female cone,
• and an inner element, which is provided with an opposing male cone and is accommodated in an axially displaceable manner in the expanding element
• and an axially directed adjustment screw which is held non-rotatably on the inner tube and is in operative connection with an internally threaded bore in the inner element,
• wherein the expanding element has a thread-free passage opening through which the adjustment screw passes,
• wherein a clamping portion is arranged on or in the expanding element, which clamping portion, in the radial direction, at least in the region of a contact surface, has a greater radius in the relaxed state than the radius of the expanding element in its expanding region which is brought about as a result of the interaction with the inner element,
• and wherein the clamping portion can be offset or displaced inward at least in the region of the contact surface in an elastic manner against a resetting force toward a central axis at least as far as up to the radius of the expanding element.