Touring bikes work better sized large. Unlike commuting, racing, recreational, or mtbing, you spend all day riding when touring. A higher handlebar height is necessary for many people for comfort for long rides repeated for several days without days off. A larger frame allows for a higher bar without extraordinary steerer tube length.

Size the bike by PBH, not your height:

http://www.rivbike.com/kb_results.asp?ID=39

http://www.rivbike.com/kb_results.asp?cat=23

I think Riv's sizing table might put you on a little too large a frame. With a 83 PBH Riv puts me on a 57.5-58cm frame, and it would be a stretch (literally) for me to fit them, either in reach or stand-over.

There's an simple, popular formula for fitting that I prefer, used by many online fit calculators:

frame size (center BB to top of top tube/seat tube intersection) = PBH x 0.67

saddle height = PBH x 0.883

These formula were derived from measuring a lot of pro racers, and originally published in a book by Lemond.

In my case, with an 83cm PBH, this works out to a 56cm frame size, and 73cm saddle height. I actually use a 72.5cm saddle height, it seems to work well and is a little more comfortable.

I'd guess you'd fit a 58 by height alone. I'm 175cm tall and ride a 56 (LHT/DT).