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Been looking into this myself and somewhere on another forum I found loads of people running 11-46 on GRX 812 mech without issue.
TM-
Which one is the 812 one?
There's 11-32 and 11-42 versions but I don't know which is which.
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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
hippy
I'm running 46x34 with 11-42 using an Ultegra Shadow RD. I don't want to touch the chainrings.
If I added a Wolftooth, what cassette could I run? 46T? Bigger?
Also, what's the difference between Goatlink and Roadlink? There's a bikepacking.com video showing a dude using 10spd Goatlink on 11spd GRX so is there actually any difference between them?