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?