On my off-road/gravel pack bike, I run a 10-51 Shimano XT MS cassette with an XT derailleur. I am using a Microshift bar end indexed shifter. On the front I have a 32X chain ring. (In general, I found a 30X to be too small for flat and slightly down hill roads.) My cranks are RaceFace Carbon Cinch with a 4 bolt 2X chainring adapter. Since I have a 2X ring mount, I have mounted a 30 tooth ring on the outside, that I've ridden with on the bike thinking I might need to swap to a 30 instead of a 32. To date, a 32 X 51 ratio has met all of my loaded up climbing needs, so I stopped carrying the extra 30T ring.