Roller assembly comprising a tire (2) having two beads (21), a rim (3) and at least one flexible expander (1) for joining one of the beads (21) and the rim (3), the rim having a rim flange (32), said stent (1) comprising an axially inner end (10), an axially outer end (11) and a body (12) oriented mainly axially and disposed between said axially outer end (11); ) and said axially inner end (10), said axially inner end (10) being immobilized on said rim, said stent (1) having a stent seat (13) for receiving a bead (21) of a tire (2), said extender seat (13) being extended axially outwardly by a shoulder (111) axially immobilizing said tire bead (21), said bead (21) of tire (2) having an axial width WB interface of the bo urrelet (21) with the extender seat (13), characterized in that said rim flange (32) extends axially under the bead (21) by a distance S such that the ratio S / WB is between 0, 1 and 0.5.
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