SIZING: Individual fitting of a bicycle is a step-wise process and a series of compromises. Professional guidance DOES simplify the process and we encourage you to be fit properly by a trained bicycle professional. Where you ride and how you ride, your fitness, and flexibility are only some of the variables.
Every body, regardless of weight, is different. Your body type is the only factor that does not change. Your inseam to height ratio, the length of your arms, the size of hands, the size of your torso etc. all factor into determining the correct fit of a bike. As a result, Cannondale highly suggests that you not rely on fit charts, but instead seek professional guidance and recommendations from an experienced bicycle shop.
Buying a Cannondale is an investment in your recreational pleasure. Fitting a Cannondale should be like fitting a wedding gown, or an expensive suit. It should fit the individual as well as either of these other fine items. Telling a rider "you need one inch of standover clearance and your Six13 fits you" does not do the product or the investment justice.
For all bicycle fit questions, please contact your Cannondale dealer.