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No co som vycital "This thread is a left (reverse) thread, and a special lock ring screws onto it. After you screw the sprocket on in the normal manner, and tighten it down securely, the lock ring screws down so that it presses against the outer surface of the sprocket. If the sprocket should start to loosen up, it will try to turn the lock ring counter clockwise...but that only tightens the lockring. As a result, the sprocket cannot be unscrewed by the chain, no matter how hard you fight the pedals." je to normalna prax len takto imho
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