Gravel / Gravé / Gnarmac / Groad / ATB

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Tijs in reply to @skinny

with a grx mid cage you can run a 46 anyway

The 1x version (817) perhaps (though it's rated to 42T), however the 2x version (815) is rated to 34T max largest sprocket (officially by Shimano).

But apart from that, MTB RDs have significantly bigger capacities, which is especially relevant if you want to run a wide range cassette in combination with a double chainset.

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skinny in reply to @Tijs

oh sure it's not ideal, sram is better in this sense. grx doesn't have enough rear range.
What they need is a grx derailleur that works with a 10-51 cassette. but then 12spd chains are different etc.

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