When I was shopping for a road bike, the guy at my LBS said I should get a 52cm, and that is what I ended up buying. I'm currently working on building up a LHT and bought one of the last remaining 52cm sage green LHTs. Now, however, when I compare my measurements with the Rivendell recommendations, I come up measuring for a 54 or 56. My road bike is comfortable but I've never ridden it for days on end or anything- I just use it for transportation around town. Based on your experiences, how accurate is the Rivendell measuring system? I'm wondering if I should sell my 52cm frame and buy a larger one (even if that would mean giving up the beloved sage green color). Thanks for any advice!