Originally Posted by
MAGAIVER
From reading shimano's not very intuitive website it seems like the RD-RX812 is for 1x applications with a 42t max cog and the RD-RX810 is for 2x applications with a 34t max cog.
That does appear to be the intent. You can see they're quite a bit different. They're also notable for having a clutch like a MTB derailleur.
The 11-42 is the XT M8000 version which means we'll have 11-42 cassettes around for at least another generation. Whew! Was worried they'd be Eagle'd away. But also means a road hub will need a spacer, since the MTB stuff never went away from the 8-9-10 speed freehub width.
RD-RX810
Search in Compatibility
RD-RX812
RD-RX812
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Genesis 49:16-17
Last edited by Darth Lefty; 05-07-19 at 01:16 PM.