I recently replaced both tires. I'm at around 6000 miles on the original tires and I replaced both front and back. I got Shinko 009 Ravens front and back and had them mounted and balanced by Cycle Gear. Now when I move through 35 to 45 mph the front end shakes side to side. It can be pretty slight, but if I remove my hands it is very obvious and probably pretty dangerous. I notice there is a lot of weight, more than I would think is usual, and it is opposite the valve stem. I've tried various pressures from 32 to 40 pounds and it seems to make no difference. The first time I called Cycle Gear they told me to give it a couple weeks to "break in." I did that but if anything it seems worse. It is just bad enough that I don't feel completely comfortable riding and its not fun. I called them again and I think they are trying to brush me off. I don't want this to be a Cycle Gear bash, I'm more wondering if anyone else has had this problem, if there is something else I should check, any suggestions?