I’ve been fettling. Fitted a smaller chainring and removed a couple of links from the chain. No hiccups.
Then I take the bike for a spin. Shifting up the cassette from 10 to 42 is faultless. Shifting down the block is weird. From 42 down to the second cog is fine. Moving the next cog requires two clicks of the shifter. Next one moves down quickly enough, but is a little rattly. One more click, slick but a little noisy. Down the rest of the block, everything seems ok.
Dérailleur hanger looks straight. Can’t think that it’s cable stretch as that would make the mech reluctant to move up the cassette, not down, surely?
Anyone else had this issue with X01 or other SRAM 1x systems? Help!