a couple of things I've noticed VS the old bike and sidecar:
-the old bike was chromoly, and the frame was steel so it was stiffer
-the shape and size of the new sidecar is better
- the aluminum frames flex is like having some dampening from the bumps
either way we are getting in as much time on the paths as we can, nice days we ride 10 to 15km and usually get at least 3 rides in a week