Axle assembly, in particular for supporting a bicyle hub, the axle assembly having an adjustable length and comprising: a first axle member comprising a recess which is open at least at one end (2a, 2b) of the first axle member, and further comprising a female threaded portion formed on an inner surface of the first axle member enclosing the recess; and a second axle member comprising an insertion portion and a protrusion portion; wherein the insertion portion of the second axle member is at least partially received or configured to be at least partially received in the recess of the first axle member and has a male threaded portion formed on an outer surface of the insertion portion, the male threaded portion of the second axle member configured to be engaged with the female threaded portion of the first axle member; and wherein when the insertion portion of the second axle member is received or at least partially received in the recess of the first axle member and the male threaded portion of the second axle member is engaged with the female threaded portion of the first axle member, the protrusion portion of the second axle member protrudes out of the recess of the first axle member and an overall length of the axle assembly is adjustable by moving the threads of the male threaded portion of the second axle member along the threads of the female threaded portion of the first axle member, or vice versa, wherein the recess of the first axle member extends all the way from a first end of the first axle member to a second end of the first axle member so that the recess of the first axle member is open at both the first end and at the second end of the first axle member, characterised in that the recess of the first axle member is configured to receive the male threaded portion of the second axle member both at the first end and at the second end of the first axle member. a first axle member comprising a recess which is open at least at one end (2a, 2b) of the first axle member, and further comprising a female threaded portion formed on an inner surface of the first axle member enclosing the recess; and a second axle member comprising an insertion portion and a protrusion portion; wherein the insertion portion of the second axle member is at least partially received or configured to be at least partially received in the recess of the first axle member and has a male threaded portion formed on an outer surface of the insertion portion, the male threaded portion of the second axle member configured to be engaged with the female threaded portion of the first axle member; and wherein when the insertion portion of the second axle member is received or at least partially received in the recess of the first axle member and the male threaded portion of the second axle member is engaged with the female threaded portion of the first axle member, the protrusion portion of the second axle member protrudes out of the recess of the first axle member and an overall length of the axle assembly is adjustable by moving the threads of the male threaded portion of the second axle member along the threads of the female threaded portion of the first axle member, or vice versa, wherein the recess of the first axle member extends all the way from a first end of the first axle member to a second end of the first axle member so that the recess of the first axle member is open at both the first end and at the second end of the first axle member, characterised in that the recess of the first axle member is configured to receive the male threaded portion of the second axle member both at the first end and at the second end of the first axle member.