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Is this doable?
Don't need it now but would like to be future proof.
Swapping from SRAM so thought I'd check before I spend any money.
You can use a Shimano 12 speed mech that'll cope with the 51t cassette with an 11 speed shifter.
I'm only running an 11-42 but I'm running an SLX 12 speed rear mech, Sunrace 11 speed cassette, KMC 11 speed chain and XT 11 speed shifter. It all works together nicely and gives me the option of using a wider range cassette in the future.
I’m running Shimano 11 speed XT rear mech with a Sunrace 50 with no problem.
I'm using the 11-51 Shimano cassette on one of my bikes at the moment but for that I decided to get the very long cage Deore mech that's designed for it and that works well and was easy to set-up.
One of my other bikes is 11-speed using the 11-46 and I think that has an XT mech so I might try that with the wheel with the 11-51 to see if it works.
Deore 12 would be great if you are using shimano shifter
A garbaruk cage will do it.