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).
