A process for manufacturing a cantilever gate, which gate (1) comprises a supporting beam (3) and an upper structure (4) mounted on the supporting beam (3), which supporting beam (3) is brought into a bent state before the mounting of the upper structure (4). The resulting curve is fixed by means of at least one stiffening member (14,15) rigidly connected with the supporting beam (3) over a substantial part of the length of the supporting beam (3). The supporting beam (3) is then completed to a cantilever gate (1) of which the upper structure (4) is mounted on the concave side of the curved supporting beam (3). The supporting beam (3) has a tubular section with longitudinal flanges between which a stiffening member (14,15) can be arranged.
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