Tange International Co. is a major manufacturer of high quality steel tubing for bicycle frames. They are a rival to the British based tubing manufacturer Reynolds. Where the defacto standard of bicycle tubing from European Bike Boom bikes is Reynolds steel the Japanese defacto standard is Tange. They were also found throughout the 1980s on many higher quality far eastern produced bikes because of the hgher cost of Reynolds steel.
They still produce high quality frame tubing to compete with companies like Reynolds and Columbus however they only produce Chromoly steel now days instead of mangamoly steel such as Reynolds 531. Their current tubing range consists of three tiers Tange Chromo, Infinity, Prestige and Ultimate.