The invention relates to a powered wheelchair (100) for transporting a person, comprising a seat frame (40) for supporting the person, a pair of opposing main wheel assemblies (20, 30), including a first main wheel assembly (20) and a second main wheel assembly (30) connected to the seat frame (40), and a third main wheel assembly (50) arranged spaced apart from the pair of opposing main wheel assemblies (20, 30) and connected to said seat frame (40). The powered wheelchair further comprises a support wheel arrangement (10) for supporting the powered wheelchair (100), said support wheel arrangement (10) having a main beam (12) and a front support wheel unit (14) capable of being applied to a ground surface (95). The main beam (12) is rotatably connected to said third main wheel assembly (50) at a third connection point (C3) and connected via a guiding mechanism (80) to the first main wheel assembly (20) at a first connection point (C1). The main beam (12) has a first portion (16) adapted to cooperate with said guiding mechanism (80) when said first portion (16) passes through a part of the guiding mechanism (80) upon movement of the main beam (12) relative to the guiding mechanism (80), to maintain said support wheel arrangement in a supporting position (S), in which the front support wheel unit is applied to the ground surface (95).Linvention concerne un fauteuil roulant motorisé (100) pour le transport dune personne, comprenant un cadre de siège (40) pour supporter la personne, une paire densembles de roues principales opposées (20, 30), comprenant un premier ensemble de roue principale (20) et un second ensemble de roue principale (30) reliés au cadre de siège (40), et un troisième ensemble de roue principale (50) disposé à distance de la paire densembles de roues principales opposées (20, 30) et relié audit cadre de siège (40). Le fauteuil roulant motorisé comprend en outre un agencement de roue de support (10) pour supporter le fauteuil roulant motorisé (100),
