Alter Midnight Series cog

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Alter's Midnight Series cogs are machined from 7075 T6 aluminum and are available in sizes 15t-19t. ⓘ All track cogs have 1.37"x24tpi threading. Any threaded cog can be used on any threaded track hub. specifications • standard 1.37"x24tpi threading • 1/2 x 1/8" only • 15-19t • colors: purple, black • weight: 21g-38g Show more