options lh side for conventional fixed or freewheel threads regular width hg cogs should never be used this rear hub offers easy and secure fixing amp servicing adjustable chainline twin cog option can run 2 cogs together accepts from 12t cogs for compact gearing and no need for chainwhip tools the halo fix g rear hub features a fixed hg spline machined as part of the alloy main hub body with a conventional internal thread for a standard hg type lockring with easy tool fi