10 speed wide ratio cassette , something that functions as a 10 by 1 so that ring not really big, since
the cassette tooth counts are small .
then a big drop to the 2nd bail out for mountain ascents , for the granny gear
The 'big' ring centered in the chainline , like the middle of a triple.

New; Sram has a 11x1 MTB kit.. top is 10t, bottom id 42t, 2nd is the 36t


my favorite now is a 7 by 2 , internal gear hub , by Rohloff..
the 7 speeds are run through twice in 2 ranges.. 14 in total