Tyre for a passenger vehicle, comprising: • a tread intended to come into contact with the ground via a tread surface and having an axial width LT, • the tread comprising two axially exterior portions (22, 23) each having an axial width (LS1, LS2) at most equal to 0.3 times the axial width LT, • the tyre further comprising a crown reinforcement radially on the inside of the tread, • the crown reinforcement comprising a working reinforcement and a hoop reinforcement, • the working reinforcement comprising at least two working layers (41, 42) each comprising reinforcing elements (411, 421) which are coated in an elastomeric material, mutually parallel and respectively form, with a circumferential direction (XX') of the tyre, an oriented angle (A1, A2) at least equal to 20° and at most equal to 50°, in terms of absolute value, and of opposite sign from one layer to the next, • the said reinforcing elements in each working layer being made up of individual metal threads or monofilaments having a cross section the smallest dimension of which is at least equal to 0.20 mm and at most equal to 0.5 mm, and a breaking strength Rm, • the density of reinforcing elements in each working layer being at least equal to 100 threads per dm and at most equal to 200 threads per dm, • the hoop reinforcement comprising at least one hooping layer comprising reinforcing elements which are mutually parallel and form, with the circumferential direction (XX') of the tyre, an angle B at most equal to 10°, in terms of absolute value, characterized in that at least one axially exterior portion (22, 23) comprising axially exterior grooves, an axially exterior groove forming a space opening onto the tread surface and being delimited by at least two main lateral faces (241, 242) connected by a bottom face, and in that at least one axially exterior groove, referred to as major groove, having a width W, defined by the distance between the two lateral faces (241, 242), at least equal to 1 mm, a depth D, defined by the maximum radial distance between the tread surface and the bottom face, at least equal to 5 mm, and a mean linear profile L, and in that the mean linear profile L of any axially exterior major groove of at least one axially exterior portion (22, 23) of the tread forms, with the circumferential direction (XX') of the tyre, an angle C belonging to the interval [min(A1,A2)+100°, max(A1, A2)+80°], and in that the angle C of the mean linear profile L of any axially exterior major groove of at least one axially exterior portion (22, 23) of the tread belongs to the interval [(A1+A2)/2+80°, (A1+A2)/2+100°], and in that the breaking strength R C of each working layer (41, 42) is at least equal to 30 000 N/dm, Rc being defined by: Rc= Rm*S*d, where Rm is the tensile breaking strength of the monofilaments in MPa, S is the cross-sectional area of the monofilaments in mm 2 and d is the density of monofilaments in the working layer considered, in number of monofilaments per dm. • a tread intended to come into contact with the ground via a tread surface and having an axial width LT, • the tread comprising two axially exterior portions (22, 23) each having an axial width (LS1, LS2) at most equal to 0.3 times the axial width LT, • the tyre further comprising a crown reinforcement radially on the inside of the tread, • the crown reinforcement comprising a working reinforcement and a hoop reinforcement, • the working reinforcement comprising at least two working layers (41, 42) each comprising reinforcing elements (411, 421) which are coated in an elastomeric material, mutually parallel and respectively form, with a circumferential direction (XX') of the tyre, an oriented angle (A1, A2) at least equal to 20° and at most equal to 50°, in terms of absolute value, and of opposite sign from one layer to the next, • the said reinforcing elements in each working layer being made up of individual metal threads or monofilaments having a cross section the smallest dimension of which is at least equal to 0.20 mm and at most equal to 0.5 mm, and a breaking strength Rm, • the density of reinforcing elements in each working layer being at least equal to 100 threads per dm and at most equal to 200 threads per dm, • the hoop reinforcement comprising at least one hooping layer comprising reinforcing elements which are mutually parallel and form, with the circumferential direction (XX') of the tyre, an angle B at most equal to 10°, in terms of absolute value,