The wife and I went on her first "on the road" ride on the Catrikes today. It was the first time that hers has been up to any manner of speed. Once doing so the front end has a tendency to wobble. It is controllable with both hands on the controls, but take one hand off, or go over a bump and the front wheels very quickly go into a steady fast shudder.

By the eye it appears to be toed in just a touch and looks straight. By the yardstick I may (or may not) have about a 1/4" difference front to back, more narrow to the front. Admittedly the method I am using is pretty crude after playing with some methods discussed in my other "alignment" thread.

Is there a tendency for these to develop a wobble like this from a specific problem or alignment issue?