Solid tire provided with means for signalling the state of excessive wear

A solid tire (4;

• 8) comprising two or more circular layers overlapped in a radial direction, wherein at least the outermost layer is made of an elastic material and consists of an external portion or tread (16), wherein said solid tire (4;
• 8) further comprises at least one layer for indicating excessive wear (10), arranged in a predefined position inside said external portion or tread (16), and wherein said at least one layer for indicating excessive wear (10) is made with a colour different from that of said external portion or tread (16), said solid tire (4;
• 8) being characterized in that said at least one layer for indicating excessive wear (10) is manufactured with the following compound of materials in the following percentages by weight:
• rubber:
• 50%/60%;
• silica:
• 20%/30%;
• one or more plasticising additives:
• 2%/8%;
• one or more compatibilizing agents between rubber and silica:
• 2%/3%;
• pigments:
• 3%/8%;
• one or more protective agents:
• 1%;
• one or more crosslinking agents:
• 3%/8%,
• wherein mineral binders are added to the pigments, in such a way that the binding of said pigments and said mineral binders gives rise to a mineral colour.