Until recently I rode a 1x9 42t / 11-36 setup with Dura Ace 9 speed bar end shifters operating a generic Deore (RD-M531?) rear derailleur. Worked pretty well. For climbs while touring I wanted another cog in the back. I updated to Dura Ace 10 speed bar ends operating a Shimano XT M772 (still 9 speed because of the same pull ratio) on a sunrace 11-40 cassette. It works similarly well on the first 9 cogs but could be better on the 10th 40T cog. I bought a cheap version of the lindarets roadlink and will see how that works out. The whole compatibility thing is shit though.
Until recently I rode a 1x9 42t / 11-36 setup with Dura Ace 9 speed bar end shifters operating a generic Deore (RD-M531?) rear derailleur. Worked pretty well. For climbs while touring I wanted another cog in the back. I updated to Dura Ace 10 speed bar ends operating a Shimano XT M772 (still 9 speed because of the same pull ratio) on a sunrace 11-40 cassette. It works similarly well on the first 9 cogs but could be better on the 10th 40T cog. I bought a cheap version of the lindarets roadlink and will see how that works out. The whole compatibility thing is shit though.