Used Shelton's gear math engine, found combining the Schlumpf mountain drive, & the current wide range 5,
the lowest in high range, and the highest, in low range, are , overlapping there, almost the same ratio..
54t, [low is 21.6 equivalent]
.... High . Low range
1) 41.7 _ 16.7
2)50.1 _ 20.0
3) 66.8 _ 26.7
4) 89.0 _ 35.6
5) 106.8 _ 42.7