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My hack bike (30 year old Rockhopper) needs new drivetrain and I'm planning to change from 3x8 to 1x9.
I have an old XT mech, shifter and new 9 speed chain in the parts box but need a cassette.
Does anyone know whether a CUES 9 speed work or would that need an CUES chain and new mech as well? NB other option is microshift cassette with similar ratios.
I don't think they are. AFAIK the sprocket spacing for 9, 10, and 11 speed CUES is the same. That means that you won't be able to use old 9-speed shifters and derailleurs with a CUES cassette.
A cheap steel cassette will last for years and will be compatible with your existing parts.
https://www.chainreactioncycles.com/p/shimano-hg400-9-speed-mtb-cassette?color=silver&cassetteTeeth=11-32t
Thanks thols that was the bit that wasn't clear from reviews I'd read. Will likely get a microshift 11-42. I have a range extending link for the large gear.
CUES is all 11 speed spacing and pull regardless of the number of cogs on the back.