String tensions for different tunings

You can apply the chart below to work out what gauge of string to use for different tunings. These strings will have a tension of just under 12kg/27lbs when tuned to the given note. For instance the optimum gauges for DADF#AD tuning would be .059-.040-.030-.022-.018-.014 instead of .056w-.042w-.032w-.024w-.017-.013 from the GHS true mediums that I put on, but the overall tension works out about the same. Try to keep the overall tension below 75kg/165lbs.

There is also a string tension calculator available online. Or you can use the D'Addario tension chart which also has tensions for flatwound strings. (Flat wound strings have a dull tone on Weissenborn type guitars, so I recommend that you avoid them)