Miche Track cogs are splined to match a carrier that threads onto the hub. This system reduces damage to the hub threads by the threading and unthreading normally required with track use. Features: Miche track cogs use a unique cog carrier (not included) that eliminates the repetitious and potentially harmful threading and unthreading that traditional track cogs require Cogs are made of special heat-treated, nickel-plated steel
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