The GS version is on the left and the SGS is on the right. The GS is rated for a 42t cog & 41 links with a double front, and and the SGS is rated for a 36t & 43 links with a triple front.



I thought this was interesting because it looks like the front knuckle is different to clear the larger cog, and the cage is almost the same length. This is pretty much the opposite of the traditional situation! I wonder if the clutch is different or only its housing. The cages look very similar but are not the same. The M7000 units are the same way and many of the parts are interchangeable from 6000 to 7000. The rear knuckle is also a different shape - look how the cable stop is carried higher on the GS.