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N.J.S.
From WikiPedalia
N.J.S. (Nihon Jitensha Shinkokai-the Japanese Bicycling Association) is the governing body of Keirin racing.
It has very strict standards, with the intention of preventing mechanical failure and "leveling the playing field" among the athletes.
Not all of the N.J.S. standards actually relate to quality as such, but rather act to promote interchangeability of parts and tools.
N.J.S. threading and sizing standards are generally the same as for Campagnolo track parts.
