A lock ring is a threaded washer used to prevent components from becoming loose during rotation.https://www.velodrome.shop/lockrings/?srsltid=AfmBOophH_M2S0zbgT372eESjHI_YAjSfiZx6WVXwkBEfw3pSQ7bgDTh They are found on an adjustable bottom bracket and a track hub of a bicycle.
See also Agitator (device) List of bicycle parts Ratchet (device) Tine (structural)
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