Tire comprising a sidewall insert

An assembly comprising:

• a tire for a lightweight vehicle, and
• a sidewall insert,
• wherein the tire has a nominal section of height H and comprises:
• two sidewalls that connect a crown of the tire respectively to two beads of the tire, each of which is intended to come into contact with a rim on which the tire is intended to be mounted,
• wherein at least one of the two sidewalls comprises:
• an axially outer sidewall face that is in contact with atmospheric air,
• an axially outer sidewall layer, which extends radially from the crown to the corresponding bead and axially inward from the axially outer sidewall face, and which comprises at least one rubber material, and
• an anchoring means, which interacts with the sidewall insert to anchor the sidewall insert and which extends circumferentially in a circumferential direction of the tire,
• wherein the anchoring means comprises:
• a recess that is formed in the axially outer sidewall layer, recessing from a portion of the axially outer sidewall face, which extends radially on both sides of the recess,
• the recess being delimited axially inward by a recess bottom and radially by two recess walls that each extend from the recess bottom to said portion of the axially outer sidewall face, and
• a protuberance, which is raised relative to the recess bottom and which extends from the recess bottom to an axially outer protuberance face of the protuberance, which is located at a vicinity of said portion of the axially outer sidewall face,
• wherein the recess has, in any meridian plane containing an axis of rotation of the tire:
• a depth Pc, which is a maximum distance measured perpendicularly between said portion of the axially outer sidewall face and the recess bottom, and which is at least equal to 2 mm, and
• a width Lc, which is measured, at said portion of the axially outer sidewall face, between the two recess walls and which is at most equal to 15% of the nominal section height H of the tire,
• wherein the protuberance comprises, in any meridian plane:
• a narrow portion, extending outward from the recess bottom and having a minimum width equal to a minimum width Lpmin of the protuberance, and
• a wide portion, extending axially outward from the narrow portion and having a maximum width equal to a maximum width Lpmax of the protuberance, the wide portion bearing the axially outer protuberance face and being stepped relative to the narrow portion,
• wherein a difference between the maximum width Lpmax and the minimum width Lpmin is at least equal to 1 mm and at most equal to 4 mm,
• wherein the sidewall insert is a single piece that is concurrently engaged in the recess and clipped over the protuberance, the single piece comprising:
• a front wall comprising an axially outer insert face, which is decorative, and an axially inner insert face, which is applied in contact with the axially outer protuberance face, and
• two rear members, which each protrude from the axially inner insert face integrally with the front wall, and which each comprise a protrusion and an edge, the two protrusions facing each other and receiving directly therebetween the narrow portion to clip the single piece to the protuberance, and the two edges facing away from each other and being locked between the two recess walls to hold the single piece in place, and
• wherein the recess is shaped into a thickness of the axially outer sidewall layer and the single piece of the sidewall insert is engaged in said thickness of the axially outer sidewall layer, so that the axially outer insert face of the front wall is flush with said portion of the axially outer sidewall face radially on both sides of the recess.