Installation of GRX822 rear derailleur?

Posted on Fri 10th, May 2024

• #1

Alex_B

I'm not having a great time installing a GRX822 rear derailleur.
Using an 11-51t 11speed cassette and following a YouTube hack, that assures me that the 12speed rear derailleur will play nicely with 11speed shifters, I'm not getting good shifting performance.

I cannot find an installation manual for this derailleur anywhere and am having trouble setting the b-screw position to place the cage at the correct height relative to the cassette. Does it fit with a standard chain, or do you need an extra long chain? It's currently sitting a bit low. It'll shift to the 51t sprocket, but is quite reluctant to shift to the 11t.

I'm using a Deore XT chain, 36t chainring 11-51t cassette, so was expecting the chain length to be correct.

Any tips would be welcome.
• #2

dubtap in reply to @Alex_B

Shimano have started merging manuals for similar products so there isn't a separate manual for the RD-RX822 it is shared with RD-RX820 and the direct mount version and they show things like different cable routes etc. for each model

https://si.shimano.com/en/dm/GARD010
• #3

Alex_B in reply to @dubtap

That's excellent. Exactly what I was looking for. Looks like I need a longer chain!
• #4

Alex_B

Added 2 links and everything works perfectly.
So annoying that the Shimano chain was too short.

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