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1x10 with my sram red shifter
Red 10-speed levers will work with 10-speed MTB rear dérailleurs, so you could use a #tester_approved X7 short cage* and go up to 36T on the cassette. Work from there for the chainring, how low do you want your bottom gear?
*Well, you could if any bugger actually had them in stock. As far as I can tell, the one they're now advertising as 9-speed is the same thing, although the part number is slightly different. The GX is supposed to split the difference between X7 and X9 in terms of quality.
Asked similar before but I have a clearer idea now, what size chainring, and what rear derailleur/cassette do i want if i want to go 1x10 with my sram red shifter and force 110bcd cranks? I think i want like 36t or maybe even 42?? cassette? whats the 'go-to' for max £200 all in