Please please please get sized or fitted or whatever you want to call it. I made the mistake of buying something that looked good and was priced good but in the end caused more harm than good. I almost took a spill two days ago due to my bike being too big and couldn't maneuver fast enough out the way. I could blame the little kids that jumped out in front of me during my workout but whatever. I went to two LBS and decided to finally take the plunge into either a 51cm Orbea Aqua TTG or 51 cm Jamis Nova Pro. Both felt great and the shop let me test drive both. What an amazing difference. I saw many used bikes on craigslist for a few hundred cheaper but I would rather pony up the great price for great service and of course a great warranty! The shop owner is a tenured rider and was very helpful. I am super stoked!