Tire Crown For A Heavy Duty Civil Engineering Vehicle

Crown of a tire for a heavy vehicle that is desensitized to attacks. The tire () comprises tread () having a median degree of surface siping TL, expressed in m/m, equal to the ratio between the cumulative length Lof the cuts (), present in a median portion of tread of axial width W, and the median area Aof the radially outer surface () of the tread (), and protective reinforcement () comprising at least two protective layers () that are formed of elastic metallic reinforcers and have a maximum breaking strength R, expressed in daN/m, such that the median degree of surface siping TLof tread () is at least equal to 5 m/mand a coupling ratio C, equal to the ratio between the maximum breaking strength Rand the median degree of surface siping TL, is at least equal to daN.