All I can say is I test road several different bikes and the Sirrus Sport immediately felt good compared to the others. I still had a bike fitting and changed the stem and seat as well as seat placement, but I first started with the "right" bike just based upon feel. I am sure any one of the other bikes probably could have been "fitted" to me as well. The difference is that I just plain and simple felt better on the Sirrus from the start.