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/ Is it possible to adjust a Tune bottom bracket to another bottom bracket cup width?

Yes, it is possible. Yes, it is possible. Together with the according distances which get mounted in the bottom bracket, the AC 38 (square bottom bracket) and the Sixpack (hexagon bottom bracket) can be rebuild. For BSA (1,37”x24) there are the following possibilities: 68mm; 68mm/E-Type; 73mm/E-Type. For a width of 73mm, the shaft should be at least 110mm, for 73mm/E-type at least 117mm. 110mm, for 73mm/E-Type min. 117mm.