A safety support (1) is described intended for being mounted on a rim (2) of a vehicle wheel within a tire (3), for supporting said tire (3) in case of pressure loss, which support comprises a substantially toroidal hollow annular body (5) made of a rigid and substantially non-extensible material including a filling (6) of elastically deformable expanded material. Advantageously, the safety support (1) of the invention is resistant to centrifugation and has an adequate contact surface with the crown portion (33), without however involving an excessive increase in the total weight of the wheel wherein the same is mounted.