Tange International Co. is a major Japanese manufacturer of high-quality steel tubing[1] for bicycle frames, established before 1920.
Where the de facto standard of bicycle tubing from European bike boom bikes is Reynolds steel, the Japanese de facto standard is Tange.
They were also found throughout the 1980s on many higher-quality far eastern-produced bikes because of the higher cost of Reynolds steel.
Their current tubing range consists of four tiers: Tange Chromo, Infinity, Prestige and Ultimate.
[3] The British bicycle manufacturer Charge also uses a variety of Tange tubing for their steel frames.