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crossedthread
In terms of gearing for the sturmey on an old tandem, my Grubb is running a 48t ring with a 19t sprocket at the moment. This is fine for gentle hills but I have a 22t sprocket as well, which I would fit if ever going further afield or with luggage etc. You’ll spin out sooner with the latter but unless you’re planning on beating any speed records it’s better to have the lower gear available for when you need it: I think it’s inadvisable to submit the power of two people honking on an old sturmey hub in case it suddenly decides to hit that infamous ‘intermediate’ gear (and down to the ground you’ll go!)