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Like this one?
https://www.evanscycles.com/genesis-core-20-2015-mountain-bike-EV223042If so, then 1x11 (1x12 would require new Microspline-compatible wheels). Deore M5100 is probably the best option.
Fork, gawd knows. You'll probably have a job finding anything that's non-boost and QR compatible.
Dropper - I'm guessing the frame doesn't have internal routing? RSP and Brand X options seem to start from just shy of £100.How knackered are the current parts? Or is it a case of your wife wanting summat better? Getting something OTP looks like a simpler option, but does anywhere have any stock?
Anyone got a bit of advice on upgrading my wife's MTB. Genesis Core 20 from 2015, cheap ish fork and running gear. Wanting to get it set up 1x 11 or 12, dropper and decent fork.
Would I just be better buying some OTP that has all this as standard?