I would like to assume readers of this site are familiar with the name Koichi Yamaguchi. If not, let me offer a quick intro. Yamaguchi began his career as the master builder for 3 Rensho in Japan during the early 1980’s. Most of his frames went between the legs of professional Keirin riders. They had to be light, durable, and fast! Keirin frames have to withstand the trials and tribulations of track racing. If one were to break, the builder would lose their NJS license and that would mean the end of the company.
