Modified Shimano GRX RD-RX812 1x11 spd rear derailleur to supports 2x11 spd w/ 11-46T cassette.

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New!! Shimano GRX RD-RX812 Modification.

The Shimano GRX RD-RX812 rear derailleur is designed for the CX/GRAVEL Bike, originally set for the front single-speed, and can support up to 42T.

For some road biker, the biggest change is that it is fully compatible with the existing 11-speed Shimano road bike shifter lever.
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Content of this video:
The original RX812 rear shifting inner and outer plate are changed to the XT RD-M8000-SGS super long cage rear derailleur to support the front double-speed crank, and further support the rear derailleur to 11-46T. (The results will are like the attached video)
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The following parts are testing in the video:
1. FC-6800 50-34T
2. CS-M8000 11-46T
3. FD-5800
4. RD-RX812 w/RD-M8000-SGS plates
5. CN-HG701

Required parts.
1. Shimano GRX RD-RX812 1x11 speed rear derailleur x1.
2. Shimano XT RD-M8000-SGS Outer Plate x1.
3. Shimano XT RD-M8000-SGS Inter Plate x1.

How to Replacement of the plate and the plate?
Please refer to the original shimano manual (Page 28, PDF File ).
https://si.shimano.com/#/en/DM/GARD001

For most bikers, these modifications might be useless.
However, people will become old, the road will never change.
It's helpful for some people like me.
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P.S. Basically, the double-speed can be work when testing after modification, but if everyone can also work up to 46T?
We can't guarantee that because it might be limited by the bike frame, technical...etc.
The suggestion of Low sprocket is still Max. 42T LOL