An anti-skid device with mounting from the outside for wheels, particularly with alloy rims with central hole, includes: a central body intended to be placed at the hub of a wheel on which the anti-skid device is to be mounted; arms radially protruding from this central body and terminating in terminal elements intended to be placed on the tread of the tire; chain segments connected to the terminal elements forming a ring on the tread of the tire; a device designed to be fixed to the rim of the wheel; a connecting element between the device and the central body of the anti-skid device; and a tensioning mechanism placed in the central body which can be actuated to pull the connecting element and bring the central body closer to the wheel hub. The device is an expansion device fixed in the central hole of the rim of the wheel.