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Track Hub
From WikiPedalia
A fixed-gear hub. Track hubs have a stepped thread, with a standard 1.37" x 24 tpi thread for the sprocket, and a smaller, left-hand thread for a locknut. The idea is that if the sprocket should start to unscrew, it will turn the lockring with it, tightening the left-hand thread, preventing the sprocket from unscrewing. There are several different threads used for the left-threaded lockring, including:
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