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Ok, the 812 is the bigger cassette one.
https://bike.shimano.com/en-US/product/component/grx-11-speed/RD-RX812.html
Ok, the 812 is the bigger cassette one.
https://bike.shimano.com/en-US/product/component/grx-11-speed/RD-RX812.html
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hippy
Been looking into this myself and somewhere on another forum I found loads of people running 11-46 on GRX 812 mech without issue.