I'm close to [MENTION=479412]Birota[/MENTION] 's size (assuming 34 is a pant's inseam not a cycling measurement). There is no correct answer 58 or 61. The 58 has a shorter headtube (2cm), slightly shorter chainstays (.5cm), and shorter top tube (1.5cm). These differences can be made up for with stem and seatpost/saddle mods. The larger frame should be a bit more 'stable' while the smaller a bit more 'responsive'. But with adventure size tires 'responsive' is a nebulous word.

In road bikes, for a smoother rides I prefer a longer wheelbase, for faster/spirited rides a smaller frame. I run between 59cm and 62/63 roadies.

Personally, i'd go 61cm with a stem length and angle that put the bars in a comfort spot. Zero setback on the seatpost. But since i don't know Birona's trunk/arms/etc lengths maybe trust the shop to get the position right. Then the rider has to fine tune.