Pneumatic safety tyre

A pneumatic safety tyre comprising a pair of bead portions (3) with a bead core (2), sidewall portions (4) extending radially outwardly one from each bead portion (2), a tread portion (5) extending between the sidewall portions (4), a toroidal carcass (6) extending through the tread (5) and sidewall (4) portions and turned up at both edges around the bead cores (2), a tread and sidewalls disposed outwardly of the carcass (6), a belt (7) disposed between the carcass (6) and the tread (5) and having cords laid at a relatively small angle to the equator of the tyre, and a sidewall reinforcing layer (10) disposed inwardly of the carcass in each sidewall portions (4) characterised by each sidewall portion (4) being provided with a minimum thickness (TE) at a position E between an outer edge point A and a 65% height point B, the thickness of each sidewall (4) gradually increasing from the minimum thickness position E toward the 65% height point B, wherein the outer edge points A are defined as the axially outer edges of a ground contacting region on the tread surface in the standard loaded state in which the tyre is mounted on its regular rim (R), inflated to its regular pressure and is loaded with its regular load, and the 65% height points B are defined as the positions at 65% height of the tyre section height H from the bead base (b) in the standard unloaded state in which the tyre is mounted on its regular rim and inflated to its regular pressure but unloaded.