Frankly, I think bicyclists get too hung up on touring bike sizes. Difference between 59cm and 58cm, 3/8 inch; you might alter the bike's height that much by difference in tire size. My Cannondale touring bike only came in four sizes, and they couldn't sell enough to keep selling touring bikes, even in just those few sizes. As far as test riding first, so often recommended, not where I live. Rarely a touring bike on the sales floor, and lots of luck being my size. A knowledgeable bike shop person will know the bike and size you up, with an eye to how your proportions mesh with the other bike parameters beside bike height. That said, I think you'll do fine, with either the 58cm or 60cm bike, after adjustments such as raising or lowering the saddle, tilting handlebars, etc. In fact, I think you'll get more out of fine tuning the various adjustments to size, then you'll get from choosing between the 58cm or 60cm bike.