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My current setup are using a full Shimano 105, medium cage GS 11-34t, crank are 50-34t. Through some digging, I want to upgrade the RD using Deore XT M8000 SGS Long, paired using wolftooth tanpan.
Based on tanpan product specification, it should work with 2 chainring setup with 11-42t sprocket. But I'm not sure. Is there anyone having experience doing this? Do I need change the crank to lower setup, a 46-30t?
According to the Deore XT RD-M8000-SGS Long specs it should work (you are right at the limit though, but they are known to be conservative). No need to change the crank/chainrings (but you can if you want to).
