A tire assembly disposed at a rim, the tire assembly comprising: a tire body being ring-shaped and comprising: a groove having a groove opening facing toward the rim; and two beads disposed at two opposite sides (410, 420) of the groove opening, respectively, the two beads configured to engage with the rim; a flexible sealing member connected to the tire body to form an inflating space with the groove, and the flexible sealing member comprising a through hole, an inner surface facing toward the tire body, and an outer surface facing away the tire body, the flexible sealing member connected to the tire body before the tire assembly being disposed at the rim; and a nozzle disposed at the flexible sealing member, the nozzle configured to allow a gas to enter the inflating space, the nozzle comprising: a base comprising a screw hole or a clearance hole, wherein the screw hole or the clearance hole corresponds to the through hole; and a valve stem, comprising: a fastening end configured to insert into the screw hole or the clearance hole; and an inflating channel configured to allow the gas to pass therethrough; the tire assembly being characterized in that: the base is disposed at the outer surface of the flexible sealing member; wherein the fastening end of the valve stem protrudes from the inner surface and the through hole after inserting into the screw hole or the clearance hole such that the inflating channel is communicated with the inflating space. a tire body being ring-shaped and comprising: a groove having a groove opening facing toward the rim; and two beads disposed at two opposite sides (410, 420) of the groove opening, respectively, the two beads configured to engage with the rim; a groove having a groove opening facing toward the rim; and two beads disposed at two opposite sides (410, 420) of the groove opening, respectively, the two beads configured to engage with the rim; a flexible sealing member connected to the tire body to form an inflating space with the groove, and the flexible sealing member comprising a through hole, an inner surface facing toward the tire body, and an outer surface facing away the tire body, the flexible sealing member connected to the tire body before the tire assembly being disposed at the rim; and a nozzle disposed at the flexible sealing member, the nozzle configured to allow a gas to enter the inflating space, the nozzle comprising: a base comprising a screw hole or a clearance hole, wherein the screw hole or the clearance hole corresponds to the through hole; and a valve stem, comprising: a fastening end configured to insert into the screw hole or the clearance hole; and an inflating channel configured to allow the gas to pass therethrough; a base comprising a screw hole or a clearance hole, wherein the screw hole or the clearance hole corresponds to the through hole; and a valve stem, comprising: a fastening end configured to insert into the screw hole or the clearance hole; and an inflating channel configured to allow the gas to pass therethrough; a fastening end configured to insert into the screw hole or the clearance hole; and an inflating channel configured to allow the gas to pass therethrough; the tire assembly being characterized in that: the base is disposed at the outer surface of the flexible sealing member; wherein the fastening end of the valve stem protrudes from the inner surface and the through hole after inserting into the screw hole or the clearance hole such that the inflating channel is communicated with the inflating space. the base is disposed at the outer surface of the flexible sealing member; wherein the fastening end of the valve stem protrudes from the inner surface and the through hole after inserting into the screw hole or the clearance hole such that the inflating channel is communicated with the inflating space.