Tread with concealed cavities comprising a wear indicator having improved visibility

A tire comprising a tread, the tire comprising at least one channel that is situated entirely below a tread surface when said tread is in a new state and extending circumferentially around the tire and wherein the at least one channel is configured intended to open up to the tread surface after a given amount of wear in order to form a groove, this channel comprising two opposite walls connected by a bottom and at least one wear indicator on this bottom, the wear indicator comprising a contact face that is intended to come into contact with a road surface when the tire reaches a wear limit, wherein the contact face of the wear indicator comprises a texture that gives it lightness known as first lightness (L*1) when said tread is new, the bottom of the channel being without a texture so that it has a lightness known as second lightness (L*2) when said tread is new, the lightnesses being expressed using a scale that ranges from 0 to 100 according to the L*a*b* color model established by the International Commission on Illumination, this tread being such that the first lightness is less than the second lightness in order to create a contrast between the bottom of the channel and the contact face of the wear indicator, the texture for obtaining the first lightness including integrally formed motifs with a repetitive mean spacing at least equal to 0.1 mm and at most equal to 0.6 mm, and

• wherein at least one measuring well is formed that opens onto the tread surface in the new state and leads into the channel in order to allow a part of the contact face of a wear indicator with the texture and the bottom of the channel without the texture to be seen.