i’ve just gone from a 3×10 on my short travel full suss [lowest gear was 22t/36t (0.61) far too low]. to a 34t / 46T (0.74), damn crook on ebay said it was a 32T chainring. but i did 65km and 1350metres last saturday and found the 34T with the bigger cog adequate..
i’m doing the rochdale rideit tomorrow which will prove if its right for me.
on a bigger suspension bike 140mm/150mm i find the 30T / 42T (11 speed) is the highest chainring i can go for the big hills, but the topend gearing is plenty (30/10 = 3.0). where i’d say you need around a 3x if you ride some road sections.
it all depends on your fitness, weight, bike (hardtail < > big suspension) wheel size, and prefered cadence
one thing i’ll say if going xt m8000 11 speed, the jump from 46T granny to the next gear 37T is massive and i didnt like it, but all the other gears felt amazing..
not been to calderdale in a few months, so think i’ll get the train over next saturday.. ;0)