hey guys! I'm in the market for a new road bike, specifically a fixed gear. I have my heart set on a Look 464, but I don't understand this sizing chart. I've seen online that some places will sell Look frames in cm's which I'm used to looking at, but specifically for this 464 I've only seen small/medium/large... im guessing the small is a 51 and a medium is a 53, but would like your guys' assistance before I make the purchase. Here's a link to the sizing chart they have for the 464 http://www.lookcycle.com/en/wp-content/uploads/sites/7/2016/07/GEOMETRIES-AL464.pdf Thanks guys!