I used to ride a 56 before moving to a Raleigh. I now ride a 57 in a Furley, a Militis, and the RXC. I am just under 6' tall and have a 34 inseam and the 57 is the perfect fit, just enough extension and not compressed at all in the cockpit area. I rode the aluminum RX1.0 two years ago and the weight difference going over barriers with the RXC is amazing. Only selling to cover the cost of team bikes for the upcoming season, staying with a 2014 carbon Raleigh. Thanks, Tim.