Adjustable seat post assembly

A seat post assembly for a human powered vehicle, said seat post assembly comprising an upper tube and a lower tube, wherein the upper tube is telescopically received inside the lower tube, said seat post assembly further comprising a motor attached to the upper tube, a lead screw connected at an upper end thereof to a drive shaft of said motor, a nut and a nut holder tube provided inside the lower tube, the lead screw attached at the lead screw's lower end to said lower tube, wherein the nut is attached to a top portion of said nut holder tube, wherein said lead screw is received by said nut, and is provided inside said upper tube and inside said nut holder tube, said seat post assembly being configured to raising or lowering the upper tube relative to the lower tube by rotating said lead screw in forward or backward direction respectively, wherein the seat post assembly further comprising a lead screw end support that is connected to the lower end of the lead screw and is axially displaceable inside the nut holder tube to minimize vibrations and noise during rotation of said lead screw.