I took the 11 and 13 cogs off an 11-36 10 speed and added a 42t cog and a 13t IRD threaded first cog and am running 13-42 10 speed with a 48t chainring on a Giant revel hardtail does everything I need riding the gravel and tarmac here in Cambodia. I also have a modified hybrid with a 46t chainring and 12x36 9 speed cassette. Both of these do well here. Most of my rides are relatively flat but lots of dust and bb sized pebbles.