An inflation valve (100; 200; 300; 400; 500; 600) for a tubeless tire, the valve comprising: a valve body (110; 210; 310; 410; 510; 610) having a proximal end (108; 208; 308; 408; 508; 608), an open distal end, and defining an internal cavity (112; 212; 312; 412; 512; 612); and a valve stem (120; 220; 320; 420; 520; 620) having a long axis and extending through the internal cavity (112; 212; 312; 412; 512; 612), such that a threaded end (150; 450; 550) of the valve stem (120; 220; 320; 420; 520; 620) protrudes beyond the open distal end of the valve body (110; 210; 310; 410; 510; 610); the inflation valve being characterised in that the proximal end (108; 208; 308; 408; 508; 608) of the valve body (110; 210; 310; 410; 510; 610) comprises a valve seat (168; 268; 368; 468; 568; 668) having an outer diameter larger than an inner diameter of the valve body (110; 210; 310; 410; 510; 610), and a corresponding proximal end of the valve stem (120; 220; 320; 420; 520; 620) includes a resilient seating surface (122; 222; 322; 422; 522; 622) and a first radial protrusion received by a first slot in a side wall of the valve body (110; 210; 310; 410; 510; 610); wherein the valve (100; 200; 300; 400; 500; 600) is configured to be transitionable between: (a) a closed position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) mates with the valve seat (168; 268; 368; 468; 568; 668) and seals the proximal end (108; 208; 308; 408; 508; 608) of the valve body (110; 210; 310; 410; 510; 610), and the threaded end (150; 450; 550) of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a first distance, and (b) an open position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) is spaced from the valve seat (168; 268; 368; 468; 568; 668), and the threaded end of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a second distance less than the first distance; and wherein the first slot and the first radial protrusion are configured to collectively restrict rotation of the valve stem (120; 220; 320; 420; 520; 620) about the long axis. a valve body (110; 210; 310; 410; 510; 610) having a proximal end (108; 208; 308; 408; 508; 608), an open distal end, and defining an internal cavity (112; 212; 312; 412; 512; 612); and a valve stem (120; 220; 320; 420; 520; 620) having a long axis and extending through the internal cavity (112; 212; 312; 412; 512; 612), such that a threaded end (150; 450; 550) of the valve stem (120; 220; 320; 420; 520; 620) protrudes beyond the open distal end of the valve body (110; 210; 310; 410; 510; 610); the inflation valve being characterised in that the proximal end (108; 208; 308; 408; 508; 608) of the valve body (110; 210; 310; 410; 510; 610) comprises a valve seat (168; 268; 368; 468; 568; 668) having an outer diameter larger than an inner diameter of the valve body (110; 210; 310; 410; 510; 610), and a corresponding proximal end of the valve stem (120; 220; 320; 420; 520; 620) includes a resilient seating surface (122; 222; 322; 422; 522; 622) and a first radial protrusion received by a first slot in a side wall of the valve body (110; 210; 310; 410; 510; 610); wherein the valve (100; 200; 300; 400; 500; 600) is configured to be transitionable between: (a) a closed position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) mates with the valve seat (168; 268; 368; 468; 568; 668) and seals the proximal end (108; 208; 308; 408; 508; 608) of the valve body (110; 210; 310; 410; 510; 610), and the threaded end (150; 450; 550) of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a first distance, and (b) an open position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) is spaced from the valve seat (168; 268; 368; 468; 568; 668), and the threaded end of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a second distance less than the first distance; and (a) a closed position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) mates with the valve seat (168; 268; 368; 468; 568; 668) and seals the proximal end (108; 208; 308; 408; 508; 608) of the valve body (110; 210; 310; 410; 510; 610), and the threaded end (150; 450; 550) of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a first distance, and (b) an open position, in which the resilient seating surface (122; 222; 322; 422; 522; 622) is spaced from the valve seat (168; 268; 368; 468; 568; 668), and the threaded end of the valve stem (120; 220; 320; 420; 520; 620) extends beyond the distal end of the valve body (110; 210; 310; 410; 510; 610) by a second distance less than the first distance; and wherein the first slot and the first radial protrusion are configured to collectively restrict rotation of the valve stem (120; 220; 320; 420; 520; 620) about the long axis.