An inset slipform paver, comprising: a machine frame; at least one left ground-engaging unit and at least one right ground engaging unit configured to support the machine frame from a ground surface along left and right support paths such that a forward operating direction of the machine frame is defined and such that the machine frame has a frame width transverse to the forward operating direction; and an adjustable width mold suspended from the machine frame between the left and right support paths such that a mold width of the adjustable width mold is adjustable without adjusting the frame width of the machine frame, wherein the adjustable width mold further comprises: a center portion; a left sideform assembly; and a right sideform assembly, wherein the adjustable width mold further comprises: one or more left spacers configured to be received between the left sideform assembly and the center portion; and one or more right spacers configured to be received between the right sideform assembly and the center portion, wherein the adjustable width mold further comprises: a left side mold actuator connected between the left sideform assembly and the center portion to move the left sideform assembly relative to the center portion; and a right side mold actuator connected between the right sideform assembly and the center portion to move the right sideform assembly relative to the center portion. a machine frame; at least one left ground-engaging unit and at least one right ground engaging unit configured to support the machine frame from a ground surface along left and right support paths such that a forward operating direction of the machine frame is defined and such that the machine frame has a frame width transverse to the forward operating direction; and an adjustable width mold suspended from the machine frame between the left and right support paths such that a mold width of the adjustable width mold is adjustable without adjusting the frame width of the machine frame, wherein the adjustable width mold further comprises: a center portion; a left sideform assembly; and a right sideform assembly, wherein the adjustable width mold further comprises: one or more left spacers configured to be received between the left sideform assembly and the center portion; and one or more right spacers configured to be received between the right sideform assembly and the center portion, wherein the adjustable width mold further comprises: a left side mold actuator connected between the left sideform assembly and the center portion to move the left sideform assembly relative to the center portion; and a right side mold actuator connected between the right sideform assembly and the center portion to move the right sideform assembly relative to the center portion. a center portion; a left sideform assembly; and a right sideform assembly, wherein the adjustable width mold further comprises: one or more left spacers configured to be received between the left sideform assembly and the center portion; and one or more right spacers configured to be received between the right sideform assembly and the center portion, wherein the adjustable width mold further comprises: a left side mold actuator connected between the left sideform assembly and the center portion to move the left sideform assembly relative to the center portion; and a right side mold actuator connected between the right sideform assembly and the center portion to move the right sideform assembly relative to the center portion. one or more left spacers configured to be received between the left sideform assembly and the center portion; and one or more right spacers configured to be received between the right sideform assembly and the center portion, wherein the adjustable width mold further comprises: a left side mold actuator connected between the left sideform assembly and the center portion to move the left sideform assembly relative to the center portion; and a right side mold actuator connected between the right sideform assembly and the center portion to move the right sideform assembly relative to the center portion. a left side mold actuator connected between the left sideform assembly and the center portion to move the left sideform assembly relative to the center portion; and a right side mold actuator connected between the right sideform assembly and the center portion to move the right sideform assembly relative to the center portion.