Originally Posted by
boomhauer
I went with the smaller of the two frames when picking out my Surly Troll and had some regrets.
Since I like to sit perfectly upright I picked a medium frame instead of the large. My thinking was that the bars would be closer to me so I wouldn't have to bend over.
Much to my surprise, I'm at the limit on the seat post, right up to the line. Also, I had to buy an extension for my uncut fork. I get to sit upright, as I wanted, but my steerer tube looks excessively long.
None of this is really a problem; it's the most upright comfortable touring bike I could ever hope for. I love sitting perfectly upright so I can look around at the world.
Tourist in MSN comments are right on the mark. I wish I consulted him before my frame purchase
To elaborate a bit more, my comments suggesting to focus most on stand over height was specific to the OPs comments about bike models where the different sizes have very little variation in top tube length. When there is more top tube length variation between different sizes, you need to focus more on that too.