Process for manufacturing an outer tread assembly

A process for manufacturing a second stage tread assembly of a road vehicle tire, comprising the steps of feeding a green annular tread cap onto a first annular surface consisting of an inner annular surface of an annular body, said first annular surface negatively reproducing a second surface consisting of a final outer annular surface of said tread cap;

• internally stitching said tread cap against said first annular surface by passing a stitching roller over a third surface substantially coaxial with said first and second surfaces, so as to form an outer surface of said tread cap similar to said second surface and simultaneously cutting the tread cap to width;
• and successively inserting into said annular body, and onto the third surface constituting an inner annular surface of said tread cap, a number of further annular components comprising a reinforced annular tread belt.