Let's offroad / mountain bike / mtb / ride dirt

just go 10 speed like the rest of us and enjoy great 35 quid cassettes and 20 quid chains forever

explain me the turbo setup like I am 5 year old pls

One of these kits, assuming it's a HG freehub body. Just plonk the sprocket in the middle and find out what gear you need to be in to line it up and then stay there

Andel, Surly, or Gusset sprockets work with 9spd chains, so I think ( same inner width? ) are ok with 12spd. The cheap pressed sprockets are thicker, so only work with 8spd chains or lower

https://www.sjscycles.co.uk/sprockets/12-gusset-double-six-sprocket-332-inch/