A tilt mechanism for a chair, configured to affect a coordinated movement of a chair seat and chair back, the tilt mechanism comprising: - a base, - a back support configured to support the chair back and pivotably coupled to the base, - a seat support configured to support the chair seat and pivotably coupled to the back support, - a first link element, wherein a first end of the first link element is pivotably coupled to the base, - a second link element, wherein a first end of the second link element is pivotably coupled to the back support and a second end of the second link element is coupled to a second end of the first link element, - a spring element, wherein a first end of the spring element is mounted at the base and a second end of the spring element is urging against the first link element at an adjustable position between the first end and the second end of the first link element; - a forward sitting adjustment element movable between a first position and a second position, wherein, when the forward sitting adjustment element is in the first position, a distance piece (51, 52) of the forward sitting adjustment element is arranged between a stop surface of the second end of the second link element and a stop surface of the base thus keeping a predefined minimum distance between the stop surface of the second end of the second link element and the stop surface of the base, and, wherein, when the forward sitting adjustment element is in the second position, the distance piece (51, 52) of the forward sitting adjustment element is not arranged between the stop surface of the second end of the second link element and the stop surface of the base thus allowing the stop surface of the second end of the second link element to contact the stop surface of the base. - a base, - a back support configured to support the chair back and pivotably coupled to the base, - a seat support configured to support the chair seat and pivotably coupled to the back support, - a first link element, wherein a first end of the first link element is pivotably coupled to the base, - a second link element, wherein a first end of the second link element is pivotably coupled to the back support and a second end of the second link element is coupled to a second end of the first link element, - a spring element, wherein a first end of the spring element is mounted at the base and a second end of the spring element is urging against the first link element at an adjustable position between the first end and the second end of the first link element; - a forward sitting adjustment element movable between a first position and a second position, wherein, when the forward sitting adjustment element is in the first position, a distance piece (51, 52) of the forward sitting adjustment element is arranged between a stop surface of the second end of the second link element and a stop surface of the base thus keeping a predefined minimum distance between the stop surface of the second end of the second link element and the stop surface of the base, and, wherein, when the forward sitting adjustment element is in the second position, the distance piece (51, 52) of the forward sitting adjustment element is not arranged between the stop surface of the second end of the second link element and the stop surface of the base thus allowing the stop surface of the second end of the second link element to contact the stop surface of the base. wherein, when the forward sitting adjustment element is in the first position, a distance piece (51, 52) of the forward sitting adjustment element is arranged between a stop surface of the second end of the second link element and a stop surface of the base thus keeping a predefined minimum distance between the stop surface of the second end of the second link element and the stop surface of the base, and, wherein, when the forward sitting adjustment element is in the second position, the distance piece (51, 52) of the forward sitting adjustment element is not arranged between the stop surface of the second end of the second link element and the stop surface of the base thus allowing the stop surface of the second end of the second link element to contact the stop surface of the base.