It is likely the older chainset is just pulled well onto the spindle, id try a new crankset / 120mm bb for starters
our rohloff bike in the shop is measuring 25mm from the outer edge of the seat tube to the middle of the chainring
thanks for checking. hmmm, hard to photo accurately, but this one is measuring (roughly) 22/23mm to inner edge of chainring, 26mm to outer edge, sounds like you could be right & it's new crankset time...
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@ibob started
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It is likely the older chainset is just pulled well onto the spindle, id try a new crankset / 120mm bb for starters
our rohloff bike in the shop is measuring 25mm from the outer edge of the seat tube to the middle of the chainring