Well, there are several factors. First, you have a much softer tire (alleged performance tire). Second, the weight of the combo actually matters more than you think. From NASA regarding Newton's laws (http://www.grc.nasa.gov/WWW/k-12/airplane/newton.html):
"The second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum (mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the "changes" expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object's mass and its acceleration a: F = m * a
For an external applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways."
Thus, when you go over a concave imperfection in the road, the inertia (based on mass) will carry you over it with a minimal disturbance to the vector (magnitude and direction) of the wheel/tire. This dampening is aided by the shock absorbers and their inherent tendency to slow the natural conversion from static energy to kinetic energy of the coil springs. When you go over a convex imperfection, the disturbance is mostly absorbed by the tire, with the rotational inertia acting as a damper. Additional forces are absorbed by the shocks/springs, and then the remaining forces are felt by the driver.
If you have doubts, ride a bicycle over a speed bump. Then, ride over it at the same speed in your Edge. The effect is more pronounced at higher speeds. In conclusion, no matter what women might say, size matters.