Hi marksru16. How tall are you? Mine is medium and I'm 5 feet 7 inches high. I bought a medium since my Giant is small and the seating tube was way high. Since I did not actually got fitted on one (never saw one in person before buying) and based on the web site measurements figured out Medium would work for me and it did after a formal fit-out (But with a 80mm stem, guess if would had bought a small the stem would had ended being around 100-110 mm). In your case you did test the small in a shop, so as long as the online store confirms you that it is a small size you should be ok.