Phil Wood's new Pro Track cogs are cut from premium heat-treated stainless steel, polished to a mirror finish, and feature RLR cutouts for a wee bit of weight savings.

Available in 17t only, because everyone knows that's the best size.

FYI: All track cogs have 1.370"x24tpi threading. ALL OF THEM. Any threaded cog can be used on any threaded track hub.