A sliding door with a magnetic support and drive system for at least one door leaf, having: - a housing accommodating the support and drive system; - a support carriage, to which the door leaf can be attached, and - a row of magnets, which is disposed in driving direction and attached to the support carriage, the magnetization of the row in the longitudinal direction thereof changing the sign at certain distances; - a coil arrangement, which is composed of several individual coils and coil cores, which are attached to the housing, which arrangement, when appropriately activating the individual coils (7a to 7c), effects an interaction with the row of magnets, which causes thrust forces, wherein the coil cores or pole shoes abutting against the latter are in an attracting action of forces with the row of magnets; - a guiding element attached to the support carriage, which element acts against the housing in order to guarantee a pre-determined vertical position of the support carriage in the support direction (z) with regard to the housing and a pre-determined gap-shaped distance (a) between the row of magnets and the coil cores respectively the pole shoes; characterized in that - a support force adjusting device (19, 20) is provided, by means of which the pre-determined gap-shaped distance (a) can be adjusted, wherein the support force adjusting device consists of at least one first screw, by means of which the relative vertical position of the coil cores, respectively of the pole shoes is adjustable with regard to the housing, and/or consists of at least one second screw, by means of which the relative vertical position of the row of magnets can be adjusted with regard to the support carriage. - a housing accommodating the support and drive system; - a support carriage, to which the door leaf can be attached, and - a row of magnets, which is disposed in driving direction and attached to the support carriage, the magnetization of the row in the longitudinal direction thereof changing the sign at certain distances; - a coil arrangement, which is composed of several individual coils and coil cores, which are attached to the housing, which arrangement, when appropriately activating the individual coils (7a to 7c), effects an interaction with the row of magnets, which causes thrust forces, wherein the coil cores or pole shoes abutting against the latter are in an attracting action of forces with the row of magnets; - a guiding element attached to the support carriage, which element acts against the housing in order to guarantee a pre-determined vertical position of the support carriage in the support direction (z) with regard to the housing and a pre-determined gap-shaped distance (a) between the row of magnets and the coil cores respectively the pole shoes; - a support force adjusting device (19, 20) is provided, by means of which the pre-determined gap-shaped distance (a) can be adjusted, wherein the support force adjusting device consists of at least one first screw, by means of which the relative vertical position of the coil cores, respectively of the pole shoes is adjustable with regard to the housing, and/or consists of at least one second screw, by means of which the relative vertical position of the row of magnets can be adjusted with regard to the support carriage.