Thread: GRX Di2
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Old 05-25-20, 05:24 AM
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Gorgeous bike indeed!

I have to admit I was surprised to see the RD-RX817 and a front derailleur - Shimano say the RD-RX817 can not be used with a front derailleur ;-)

[edit] so I had a quick look on some Shimano pages and found this:

The RD-RX817 is a clean-slate 1x-only rear derailleur. Its total chain capacity is less than the RD-M8050-GS because the XT derailleur was designed to work on either a 1x or 2x mountain drivetrain.
The specification page on says this without saying it explicitly. The 31t total capacity is just enough to handle the 11-42.
Attempting to run a 2x11 setup with a 40 or 42 tooth large cog will give reduced shifting quality and may result in damage or injury.
Still, it clearly works for you, so enjoy ;-)

Last edited by TerryDi2C; 05-25-20 at 05:59 AM.
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