![]() These were made by Shimano specifically for the Olympic velodrome track races and were designed for the strongest riders in the world at the time! To my knowledge these rings were never made for mass production or sale. ![]() Very sought after and VERY rare in the US. more are extremely high quality and top of the line. Shimano Dura Ace Olympic Zen NJS Pista/ Track Chainring 47 tooth 151 BCD 1/8 Track Pitch NJS stamped and approved 1960's(Pre 1970's) Forged These.
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