Wow. I just re-read my post from last weekend and realized I test-rode a 51cm Ruby last weekend; the 47cm was the Synapse. So, today I went down to a 44cm. Crazy how each bike shope put me on such a dramatically different size - both without a professional fit. This truly scares me. How am I supposed to know what my true fit is? On a fellow TE members' recommendation, I hope to get in with Davis Wheelworks for a real fitting . . .