Abstract: A pump (1) for housing within a tyre, the pump (1) comprising: a fluid chamber comprising an inlet (4) operatively connectable to the environment and an outlet (6) operatively connectable to a tyre cavity; wherein the fluid chamber is compressible and is configurable to expel air into a tyre cavity via the outlet during compression of the fluid chamber and draw air in from the environment via the inlet during expansion of the fluid chamber; an actuation member configurable to extend through the tread of a tyre for contacting a road surface during use; the actuation member comprising a plate (18) configured to compress the fluid chamber; wherein the actuation member is configured to move between a first position, in which the fluid chamber is expanded, and a second position, in which the fluid chamber is compressed by the plate (18); and the pump (1) is configurable such that, in use, a part of the actuation member is in fluid communication with the tyre cavity and fluid pressure contributes to a first force o

Abstract: A pump for use on the inside surface of the tread of a tyre, the pump comprising: a base plate for attaching to the inside surface of the tread of a tyre; a compression plate; a first restraint connected to the base plate and arranged to engage a first side of the compression plate; a second restraint connected to the base plate and arranged to engage a second side of the compression plate; and a compressible chamber arranged between the compression plate and the base plate; wherein the compressible chamber comprises an inlet and an outlet and is arranged to contain a fluid; wherein the pump is arranged such that when the pump is attached to the inside surface of the tread of a rolling tyre, the first and second restraints move the compression plate relative to the base plate as the pump traverses a contact patch of the tyre such that the compressible chamber is peristaltically compressed between the compression plate and the base plate, ejecting fluid from the compressible chamber through the outlet and then