A lifting-lowering and sliding group for door or window wings, comprising at least one carriage (11a, 11b) in turn comprising: a support body (14a, 14b) which is provided with support and rolling elements (15a, 15b) and which is associable with a sliding guide in a mobile manner in translation along the sliding direction of the door or window wing, an attachment body (17a, 17b) to said wing which is fixable to the lower crossbar of said wing and which is associated with said support body (14a, 14b) in a mobile manner on a plane parallel to the lying plane of said wing with a relative combined translation motion along said sliding direction and along a direction orthogonal to it for lifting and lowering said wing with respect to said support body (14a, 14b), wherein said carriage (11a, 11b) has an end associable with a manoeuvring mechanism (12, 13) of the lifting-lowering and sliding group for the relative displacement of said attachment body (17a, 17b) with respect to said support body (14a, 14b), said manoeuvring mechanism being activatable by a control handle associable with said wing, characterized in that said support body (14a, 14b) of said at least one carriage (11a, 11b) comprises a guide body (19a, 19b) of elastic means (20a, 20b) acting between said support body (14a, 14b) and a counter element (21a, 21b) of the carriage (11a, 11b) which is associable with said lower crossbar of said wing and which is associated with said guide body (19a, 19b) in a mobile manner in translation along said sliding direction and along said direction orthogonal to it, wherein said at least one carriage (11a, 11b) assumes a first configuration, wherein said attachment body (17a, 17b) is in a lowered position with respect to said support body (14a, 14b) and said elastic means (20a, 20b) are compressed between said support body (14a, 14b) and said counter element (21a, 21b) in a first compression state, and a second configuration, wherein said attachment body (17a, 17b) is in a raised position with respect to said support body (14a, 14b) and said elastic means (20a, 20b) are compressed between said support body (14a, 14b) and said counter element (21a, 21b) in a second compression state, and wherein said at least one carriage (11a, 11b) comprises adjusting means (22a, 22b) of said first compression state of said elastic means (20a, 20b), wherein said second compression state is lower than said first compression state and wherein said elastic means (20a, 20b) assist the passage of said carriage (11a, 11b) from said first configuration to said second configuration and contrast the weight of said wing when said carriage (11a, 11b) is in said second configuration, said counter element (21a, 21b) and said attachment body (17a, 17b) consisting of distinct and separate bodies and said adjusting means being suitable for modifying, in the mounting phase of said group, the position of said counter element with respect to said support body when said carriage is in said first configuration. a support body (14a, 14b) which is provided with support and rolling elements (15a, 15b) and which is associable with a sliding guide in a mobile manner in translation along the sliding direction of the door or window wing, an attachment body (17a, 17b) to said wing which is fixable to the lower crossbar of said wing and which is associated with said support body (14a, 14b) in a mobile manner on a plane parallel to the lying plane of said wing with a relative combined translation motion along said sliding direction and along a direction orthogonal to it for lifting and lowering said wing with respect to said support body (14a, 14b), wherein said carriage (11a, 11b) has an end associable with a manoeuvring mechanism (12, 13) of the lifting-lowering and sliding group for the relative displacement of said attachment body (17a, 17b) with respect to said support body (14a, 14b), said manoeuvring mechanism being activatable by a control handle associable with said wing,