Thanks guys - - I'm a hair under 5'10", but my inseam is only about 28.5", that's how I get the small crank measurement. I just wanted to test it to see if it was more comfortable before I bought my next bike, especially since I keep a bike for at least 10 years usually. I do get that 'knee in the gut' feeling if I'm in the drops, but I'll probably just wait until next year and try a 165MM. If the difference is noticeable, I'll ask about 160MM.