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@Greenbank
Maths fail.
A 70" gear means you travel pi * 70" for each pedal revolution. (70" is the equivalent diameter of a penny farthing wheel).
108,000 pedal revolutions of a 70" gear is about 603km.
You want about 34,400 pedal revolutions for a 70" gear.
Stick this into google and it'll calculate it for you (adjust to suit distance and gear):-
185km / ( pi * 70 inches )