Need some advice
I purchased a 2009 supersix hi-mod frame at the great price of 1850 Cdn. I had the bike built up with my old 9 speed ultegra and Mavic open pro wheels. After about 1 year of use the seat tube developed a 6 inch fracture on the vertical. Cannondale says no problem they will replace the frame under warranty. My question is as follows. Given that I am 5 10 and 200 lbs and do about 3000 to 4000 Km per yr about 60 Km per outing, would it be in my interest to ask Cannondale to replace the supersix by a synapse. I only bought the supersix because it was a great price. As to how it rides I have no complaints.