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I think there was a video of it working with a 50t cassette a few pages back..
EDIT: there you go https://www.instagram.com/p/CBYkj30A44_/?utm_source=ig_web_copy_link
I am running the 810 on a 11-40 cassette (shimano rates it for 11-34)
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Just set up a Ultegra r8000 with GRX 30-46 chainset and slx 11-42 cassette. All works perfectly- was so surprised - wish I knew before my tour last year.
giofox
TM
@Saffronspokes
Given all this 1x chat can anyone confirm that a Sram 10-42 11spd cassette would work with the Shimano GRX 812 derailleur? From a bit of Google it seems like it does work fine but isn't endorsed by Shimano. Anyone on here used a similar set up?