You don't have the leg completly extended when on the bottom of the pedal stroke, isn't this the missing factor? Measure the saddle height on the bike that she is driving currently?
True, but that would give a number less than 5 (<75-54-16 = <5) surely?!
So less than 16, which is further from 25!
@FredyCro started
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You don't have the leg completly extended when on the bottom of the pedal stroke, isn't this the missing factor?
Measure the saddle height on the bike that she is driving currently?