A runflat device, and a method of fitting a runflat device. The runflat device can include a chain of segments which is flexible enough to be manipulated for fitting, while also being laterally stable to ensure correct positioning and to avoid misalignment when tightening onto a wheel. The fitting method initially expands the runflat device within the cavity of the tire, retaining the runflat device securely in place against the inside of the tire's tread area. This advantageously leaves the beads of the tire unobstructed for fitting to a wheel.

A balanced non-deflatable vehicle tire providing balanced operation even after partial puncture, adjustment of overall air pressure, use of standard rimmed wheels, and the option of being retrofit into existing tires, by providing alternating layers of puncture-resistant sheet material and pressurized-cell sheets, and an inner-tube to fill the remaining internal space and to adjust and apply balanced pressure internally.

A runflat device, and a method of fitting a runflat device. The runflat device can include a chain of segments which is flexible enough to be manipulated for fitting, while also being laterally stable to ensure correct positioning and to avoid misalignment when tightening onto a wheel. The fitting method initially expands the runflat device within the cavity of the tyre, retaining the runflat device securely in place against the inside of the tyre's tread area. This advantageously leaves the beads of the tyre unobstructed for fitting to a wheel.

A runflat device can include a double sided beadlock. The runflat device can be fitted to any size and type of wheel, regardless of a shape and depth of a wheel well. The runflat device can be fitted using standard tools, and may be tightened by manipulation of a valve assembly.