Tyre-type device intended to equip a vehicle, comprising: - a radially outer structure of revolution, the axis of revolution of which is the axis of rotation (YY') of the tyre-type device and which is intended to come into contact with the ground via a tread comprising at least one elastomeric material, the radially outer structure of revolution having two axial ends and comprising a circumferential reinforcement, - a radially inner structure of revolution that is coaxial with the radially outer structure of revolution and is intended to ensure the connection of the tyre-type device with a means for mounting on the vehicle, the radially inner structure of revolution having two axial ends and comprising at least one polymeric material, - an inner annular space of mean radial height H that is radially delimited by the radially outer and radially inner structures of revolution, respectively, - a bearing structure made up of a plurality of bearing elements that extend continuously from the radially outer structure of revolution to the radially inner structure of revolution and are independent in pairs, that is to say are not mechanically connected together, in the inner annular space, such that, when the tyre-type device is subjected to a nominal radial load Z and is in contact with flat ground via an area of contact A, the n bearing elements that are connected to that portion of the radially outer structure of revolution in contact with the ground are made to buckle under compression and at least some of the bearing elements that are connected to that portion of the radially outer structure of revolution that is not in contact with the ground are under tension, - each bearing element having a force at break under tension Fr, and a mean section S that has an aspect ratio K equal to L/E, where L and E are the largest and smallest characteristic dimensions, respectively, of the mean section S, characterized in that the smallest characteristic dimension E of the mean section S of any bearing element is at most equal to 0.02 times the mean radial height H of the inner annular space, in that the surface density D of the bearing elements per unit area of the radially outer structure of revolution, expressed in 1/m 2, is at least equal to Z/(A*∑Fr/n), where Z is the nominal radial load, expressed in N, A is the area of contact with the ground, expressed in m 2, and ∑Fr/n is the mean force at break under tension of the n bearing elements made to buckle under compression, expressed in N, and in that the tyre-type device comprises two sidewalls that connect the axial ends of the radially outer and radially inner structures of revolution, respectively, and axially delimit the inner annular space, such that the inner annular space forms a closed cavity that can be pressurized by an inflation gas. - a radially outer structure of revolution, the axis of revolution of which is the axis of rotation (YY') of the tyre-type device and which is intended to come into contact with the ground via a tread comprising at least one elastomeric material, the radially outer structure of revolution having two axial ends and comprising a circumferential reinforcement, - a radially inner structure of revolution that is coaxial with the radially outer structure of revolution and is intended to ensure the connection of the tyre-type device with a means for mounting on the vehicle, the radially inner structure of revolution having two axial ends and comprising at least one polymeric material, - an inner annular space of mean radial height H that is radially delimited by the radially outer and radially inner structures of revolution, respectively, - a bearing structure made up of a plurality of bearing elements that extend continuously from the radially outer structure of revolution to the radially inner structure of revolution and are independent in pairs, that is to say are not mechanically connected together, in the inner annular space, such that, when the tyre-type device is subjected to a nominal radial load Z and is in contact with flat ground via an area of contact A, the n bearing elements that are connected to that portion of the radially outer structure of revolution in contact with the ground are made to buckle under compression and at least some of the bearing elements that are connected to that portion of the radially outer structure of revolution that is not in contact with the ground are under tension, - each bearing element having a force at break under tension Fr, and a mean section S that has an aspect ratio K equal to L/E, where L and E are the largest and smallest characteristic dimensions, respectively, of the mean section S,