I have a Schwinn Meridian trike with a 212cc predator engine. At about 30MPH the front wheel hops and vibrates so bad its hard to control. The wheel looks true in both axis. I checked the bearing cones for correct adjustment, no play. wheel turns easy. Has anyone else experienced this problem? If so, what did you do to correct it. I am going to tear the wheel down and check the bearings and grease. I am also going to remove the tire and see if the tube is twisted or folded. I will then rotate the tire 180 degrees and put it back on the bike for a trial run, Any more suggestions while I have it apart.